1 | unit UMetaCanvas;
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2 |
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3 | {$mode delphi}
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4 |
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5 | interface
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6 |
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7 | uses
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8 | Classes, SysUtils, Graphics, Contnrs, Types;
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9 |
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10 | type
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11 | TArrayOfPoint = array of TPoint;
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12 |
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13 | { TCanvasObject }
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14 |
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15 | TCanvasObject = class
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16 | procedure Paint(Canvas: TCanvas); virtual;
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17 | procedure Zoom(Factor: Double); virtual;
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18 | procedure Move(Delta: TPoint); virtual;
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19 | end;
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20 |
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21 | { TCanvasText }
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22 |
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23 | TCanvasText = class(TCanvasObject)
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24 | Brush: TBrush;
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25 | Font: TFont;
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26 | Position: TPoint;
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27 | Text: string;
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28 | procedure Paint(Canvas: TCanvas); override;
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29 | procedure Zoom(Factor: Double); override;
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30 | procedure Move(Delta: TPoint); override;
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31 | constructor Create;
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32 | destructor Destroy; override;
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33 | end;
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34 |
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35 | { TCanvasRectangle }
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36 |
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37 | TCanvasRectangle = class(TCanvasObject)
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38 | Pen: TPen;
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39 | Brush: TBrush;
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40 | BoundingRect: TRect;
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41 | procedure Paint(Canvas: TCanvas); override;
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42 | procedure Zoom(Factor: Double); override;
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43 | procedure Move(Delta: TPoint); override;
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44 | constructor Create;
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45 | destructor Destroy; override;
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46 | end;
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47 |
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48 | { TCanvasLine }
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49 |
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50 | TCanvasLine = class(TCanvasObject)
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51 | Pen: TPen;
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52 | P1, P2: TPoint;
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53 | procedure Paint(Canvas: TCanvas); override;
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54 | procedure Zoom(Factor: Double); override;
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55 | procedure Move(Delta: TPoint); override;
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56 | constructor Create;
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57 | destructor Destroy; override;
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58 | end;
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59 |
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60 | { TCanvasPolygon }
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61 |
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62 | TCanvasPolygon = class(TCanvasObject)
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63 | Pen: TPen;
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64 | Brush: TBrush;
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65 | Points: array of TPoint;
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66 | procedure Paint(Canvas: TCanvas); override;
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67 | procedure Zoom(Factor: Double); override;
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68 | procedure Move(Delta: TPoint); override;
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69 | constructor Create;
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70 | destructor Destroy; override;
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71 | end;
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72 |
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73 | { TCanvasEllipse }
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74 |
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75 | TCanvasEllipse = class(TCanvasObject)
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76 | Pen: TPen;
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77 | Brush: TBrush;
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78 | BoundingRect: TRect;
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79 | procedure Paint(Canvas: TCanvas); override;
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80 | procedure Zoom(Factor: Double); override;
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81 | procedure Move(Delta: TPoint); override;
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82 | constructor Create;
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83 | destructor Destroy; override;
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84 | end;
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85 |
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86 | { TCanvasPie }
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87 |
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88 | TCanvasPie = class(TCanvasObject)
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89 | Pen: TPen;
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90 | Brush: TBrush;
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91 | BoundingRect: TRect;
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92 | StartPoint: TPoint;
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93 | EndPoint: TPoint;
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94 | procedure Paint(Canvas: TCanvas); override;
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95 | procedure Zoom(Factor: Double); override;
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96 | procedure Move(Delta: TPoint); override;
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97 | constructor Create;
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98 | destructor Destroy; override;
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99 | end;
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100 |
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101 | { TCanvasStretchDraw }
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102 |
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103 | TCanvasStretchDraw = class(TCanvasObject)
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104 | SrcGraphic: TGraphic;
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105 | DestRect: TRect;
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106 | procedure Paint(Canvas: TCanvas); override;
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107 | procedure Zoom(Factor: Double); override;
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108 | procedure Move(Delta: TPoint); override;
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109 | constructor Create;
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110 | destructor Destroy; override;
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111 | end;
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112 |
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113 | { TMetaCanvas }
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114 |
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115 | TMetaCanvas = class(TCanvas)
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116 | private
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117 | FSize: TPoint;
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118 | FPenPos: TPoint;
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119 | protected
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120 | procedure SetHeight(AValue: Integer); override;
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121 | function GetHeight: Integer; override;
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122 | procedure SetWidth(AValue: Integer); override;
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123 | function GetWidth: Integer; override;
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124 | procedure DoLine (x1,y1,x2,y2:integer); override;
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125 | procedure DoTextOut(X, Y: Integer; Text: string); override;
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126 | procedure DoRectangle(const Bounds: TRect); override;
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127 | procedure DoRectangleFill(const Bounds: TRect); override;
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128 | procedure DoPolygon(const Points: array of TPoint); override;
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129 | procedure CreateHandle; override;
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130 | procedure DoEllipse(const Bounds: TRect); override;
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131 | procedure DoMoveTo(X, Y: Integer); override;
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132 | procedure DoLineTo(X, Y: Integer); override;
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133 | public
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134 | Objects: TObjectList;
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135 | procedure TextOut(X,Y: Integer; const Text: String); override;
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136 | procedure Polygon(Points: PPoint; NumPts: Integer; Winding: boolean = False); override;
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137 | procedure Ellipse(x1, y1, x2, y2: Integer); override;
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138 | procedure StretchDraw(const DestRect: TRect; SrcGraphic: TGraphic); override;
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139 | function TextExtent(const Text: string): TSize; override;
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140 | procedure Pie(EllipseX1, EllipseY1, EllipseX2, EllipseY2,
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141 | StartX, StartY, EndX, EndY: Integer); override;
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142 | procedure SetSize(Size: TPoint);
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143 | procedure Reset;
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144 | procedure DrawTo(Canvas: TCanvas);
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145 | procedure Zoom(Factor: Double);
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146 | procedure Move(Delta: TPoint);
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147 | constructor Create;
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148 | destructor Destroy; override;
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149 | end;
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150 |
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151 | implementation
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152 |
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153 | uses
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154 | UGeometric;
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155 |
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156 | { TCanvasPie }
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157 |
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158 | procedure TCanvasPie.Paint(Canvas: TCanvas);
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159 | begin
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160 | Canvas.Brush.Assign(Brush);
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161 | Canvas.Pen.Assign(Pen);
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162 | Canvas.Pie(BoundingRect.Left, BoundingRect.Top,
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163 | BoundingRect.Right, BoundingRect.Bottom, StartPoint.X, StartPoint.Y,
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164 | EndPoint.X, EndPoint.Y);
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165 | end;
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166 |
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167 | procedure TCanvasPie.Zoom(Factor: Double);
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168 | begin
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169 | BoundingRect := Rect(Trunc(BoundingRect.Left * Factor),
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170 | Trunc(BoundingRect.Top * Factor),
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171 | Trunc(BoundingRect.Right * Factor),
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172 | Trunc(BoundingRect.Bottom * Factor));
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173 | Pen.Width := Trunc(Pen.Width * Factor);
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174 | StartPoint := Point(Trunc(StartPoint.X * Factor), Trunc(StartPoint.Y * Factor));
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175 | EndPoint := Point(Trunc(EndPoint.X * Factor), Trunc(EndPoint.Y * Factor));
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176 | end;
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177 |
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178 | procedure TCanvasPie.Move(Delta: TPoint);
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179 | begin
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180 | BoundingRect := ShiftRect(BoundingRect, Delta);
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181 | StartPoint := AddPoint(StartPoint, Delta);
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182 | EndPoint := AddPoint(EndPoint, Delta);
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183 | end;
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184 |
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185 | constructor TCanvasPie.Create;
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186 | begin
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187 | Pen := TPen.Create;
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188 | Brush := TBrush.Create;
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189 | end;
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190 |
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191 | destructor TCanvasPie.Destroy;
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192 | begin
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193 | Pen.Free;
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194 | Brush.Free;
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195 | inherited Destroy;
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196 | end;
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197 |
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198 | { TCanvasStretchDraw }
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199 |
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200 | procedure TCanvasStretchDraw.Paint(Canvas: TCanvas);
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201 | begin
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202 | Canvas.StretchDraw(DestRect, SrcGraphic);
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203 | end;
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204 |
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205 | procedure TCanvasStretchDraw.Zoom(Factor: Double);
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206 | begin
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207 | DestRect := Rect(Trunc(DestRect.Left * Factor),
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208 | Trunc(DestRect.Top * Factor),
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209 | Trunc(DestRect.Right * Factor),
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210 | Trunc(DestRect.Bottom * Factor));
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211 | end;
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212 |
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213 | procedure TCanvasStretchDraw.Move(Delta: TPoint);
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214 | begin
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215 | DestRect := ShiftRect(DestRect, Delta);
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216 | end;
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217 |
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218 | constructor TCanvasStretchDraw.Create;
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219 | begin
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220 | SrcGraphic := nil;
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221 | end;
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222 |
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223 | destructor TCanvasStretchDraw.Destroy;
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224 | begin
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225 | inherited Destroy;
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226 | end;
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227 |
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228 | { TCanvasEllipse }
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229 |
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230 | procedure TCanvasEllipse.Paint(Canvas: TCanvas);
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231 | begin
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232 | Canvas.Pen.Assign(Pen);
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233 | Canvas.Brush.Assign(Brush);
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234 | Canvas.Ellipse(BoundingRect);
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235 | end;
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236 |
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237 | procedure TCanvasEllipse.Zoom(Factor: Double);
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238 | begin
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239 | BoundingRect := Rect(Trunc(BoundingRect.Left * Factor),
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240 | Trunc(BoundingRect.Top * Factor),
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241 | Trunc(BoundingRect.Right * Factor),
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242 | Trunc(BoundingRect.Bottom * Factor));
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243 | Pen.Width := Trunc(Pen.Width * Factor);
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244 | end;
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245 |
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246 | procedure TCanvasEllipse.Move(Delta: TPoint);
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247 | begin
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248 | BoundingRect := ShiftRect(BoundingRect, Delta);
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249 | end;
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250 |
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251 | constructor TCanvasEllipse.Create;
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252 | begin
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253 | Pen := TPen.Create;
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254 | Brush := TBrush.Create;
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255 | end;
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256 |
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257 | destructor TCanvasEllipse.Destroy;
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258 | begin
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259 | Pen.Free;
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260 | Brush.Free;
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261 | inherited Destroy;
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262 | end;
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263 |
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264 | { TCanvasPolygon }
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265 |
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266 | procedure TCanvasPolygon.Paint(Canvas: TCanvas);
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267 | begin
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268 | Canvas.Pen.Assign(Pen);
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269 | Canvas.Brush.Assign(Brush);
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270 | Canvas.Polygon(Points);
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271 | end;
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272 |
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273 | procedure TCanvasPolygon.Zoom(Factor: Double);
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274 | var
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275 | I: Integer;
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276 | begin
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277 | for I := 0 to High(Points) do
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278 | Points[I] := Point(Trunc(Points[I].X * Factor),
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279 | Trunc(Points[I].Y * Factor));
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280 | Pen.Width := Trunc(Pen.Width * Factor);
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281 | end;
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282 |
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283 | procedure TCanvasPolygon.Move(Delta: TPoint);
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284 | var
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285 | I: Integer;
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286 | begin
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287 | for I := 0 to High(Points) do
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288 | Points[I] := AddPoint(Points[I], Delta);
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289 | end;
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290 |
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291 | constructor TCanvasPolygon.Create;
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292 | begin
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293 | Pen := TPen.Create;
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294 | Brush := TBrush.Create;
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295 | end;
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296 |
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297 | destructor TCanvasPolygon.Destroy;
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298 | begin
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299 | Brush.Free;
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300 | Pen.Free;
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301 | inherited Destroy;
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302 | end;
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303 |
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304 | { TCanvasLine }
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305 |
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306 | procedure TCanvasLine.Paint(Canvas: TCanvas);
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307 | begin
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308 | Canvas.Pen.Assign(Pen);
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309 | Canvas.Line(P1, P2);
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310 | end;
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311 |
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312 | procedure TCanvasLine.Zoom(Factor: Double);
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313 | begin
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314 | P1 := Point(Trunc(P1.X * Factor), Trunc(P1.Y * Factor));
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315 | P2 := Point(Trunc(P2.X * Factor), Trunc(P2.Y * Factor));
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316 | Pen.Width := Trunc(Pen.Width * Factor);
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317 | end;
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318 |
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319 | procedure TCanvasLine.Move(Delta: TPoint);
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320 | begin
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321 | P1 := AddPoint(P1, Delta);
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322 | P2 := AddPoint(P2, Delta);
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323 | end;
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324 |
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325 | constructor TCanvasLine.Create;
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326 | begin
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327 | Pen := TPen.Create;
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328 | end;
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329 |
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330 | destructor TCanvasLine.Destroy;
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331 | begin
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332 | Pen.Free;
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333 | inherited Destroy;
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334 | end;
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335 |
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336 | { TCanvasRectangle }
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337 |
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338 | procedure TCanvasRectangle.Paint(Canvas: TCanvas);
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339 | begin
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340 | Canvas.Pen.Assign(Pen);
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341 | Canvas.Brush.Assign(Brush);
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342 | Canvas.Rectangle(BoundingRect);
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343 | end;
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344 |
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345 | procedure TCanvasRectangle.Zoom(Factor: Double);
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346 | begin
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347 | BoundingRect := Rect(Trunc(BoundingRect.Left * Factor),
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348 | Trunc(BoundingRect.Top * Factor),
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349 | Trunc(BoundingRect.Right * Factor),
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350 | Trunc(BoundingRect.Bottom * Factor));
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351 | Pen.Width := Trunc(Pen.Width * Factor);
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352 | end;
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353 |
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354 | procedure TCanvasRectangle.Move(Delta: TPoint);
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355 | begin
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356 | ShiftRect(BoundingRect, Delta);
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357 | end;
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358 |
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359 | constructor TCanvasRectangle.Create;
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360 | begin
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361 | Pen := TPen.Create;
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362 | Brush := TBrush.Create;
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363 | end;
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364 |
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365 | destructor TCanvasRectangle.Destroy;
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366 | begin
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367 | Pen.Free;
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368 | Brush.Free;
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369 | inherited Destroy;
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370 | end;
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371 |
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372 | { TCanvasText }
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373 |
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374 | procedure TCanvasText.Paint(Canvas: TCanvas);
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375 | begin
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376 | Canvas.Brush.Assign(Brush);
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377 | Canvas.Font.Assign(Font);
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378 | Canvas.TextOut(Position.X, Position.Y, Text);
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379 | end;
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380 |
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381 | procedure TCanvasText.Zoom(Factor: Double);
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382 | begin
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383 | Position := Point(Trunc(Position.X * Factor), Trunc(Position.Y * Factor));
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384 | Font.Size := Trunc(Font.Size * Factor);
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385 | end;
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386 |
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387 | procedure TCanvasText.Move(Delta: TPoint);
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388 | begin
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389 | Position := AddPoint(Position, Delta);
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390 | end;
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391 |
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392 | constructor TCanvasText.Create;
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393 | begin
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394 | Font := TFont.Create;
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395 | Brush := TBrush.Create;
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396 | end;
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397 |
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398 | destructor TCanvasText.Destroy;
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399 | begin
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400 | Brush.Free;
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401 | Font.Free;
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402 | inherited Destroy;
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403 | end;
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404 |
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405 | { TCanvasObject }
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406 |
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407 | procedure TCanvasObject.Paint(Canvas: TCanvas);
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408 | begin
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409 |
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410 | end;
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411 |
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412 | procedure TCanvasObject.Zoom(Factor: Double);
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413 | begin
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414 |
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415 | end;
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416 |
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417 | procedure TCanvasObject.Move(Delta: TPoint);
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418 | begin
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419 | end;
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420 |
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421 | { TMetaCanvas }
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422 |
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423 | procedure TMetaCanvas.SetHeight(AValue: Integer);
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424 | begin
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425 | FSize.Y := AValue;
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426 | end;
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427 |
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428 | function TMetaCanvas.GetHeight: Integer;
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429 | begin
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430 | Result := FSize.Y;
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431 | end;
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432 |
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433 | procedure TMetaCanvas.SetWidth(AValue: Integer);
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434 | begin
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435 | FSize.X := AValue;
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436 | end;
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437 |
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438 | function TMetaCanvas.GetWidth: Integer;
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439 | begin
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440 | Result := FSize.X;
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441 | end;
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442 |
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443 | procedure TMetaCanvas.DoLine(x1, y1, x2, y2: integer);
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444 | var
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445 | NewObj: TCanvasLine;
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446 | begin
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447 | NewObj := TCanvasLine.Create;
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448 | NewObj.Pen.Assign(Pen);
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449 | NewObj.P1 := Point(X1, Y1);
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450 | NewObj.P2 := Point(X2, Y2);
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451 | Objects.Add(NewObj);
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452 | end;
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453 |
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454 | procedure TMetaCanvas.DoTextOut(X, Y: Integer; Text: string);
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455 | var
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456 | NewObj: TCanvasText;
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457 | begin
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458 | NewObj := TCanvasText.Create;
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459 | NewObj.Font.Assign(Font);
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460 | NewObj.Brush.Assign(Brush);
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461 | NewObj.Position := Point(X, Y);
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462 | NewObj.Text := Text;
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463 | Objects.Add(NewObj);
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464 | end;
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465 |
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466 | procedure TMetaCanvas.TextOut(X, Y: Integer; const Text: String);
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467 | begin
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468 | DoTextOut(X, Y, Text);
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469 | end;
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470 |
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471 | procedure TMetaCanvas.DoRectangle(const Bounds: TRect);
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472 | var
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473 | NewObj: TCanvasRectangle;
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474 | begin
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475 | NewObj := TCanvasRectangle.Create;
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476 | NewObj.Pen.Assign(Pen);
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477 | NewObj.BoundingRect := Bounds;
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478 | Objects.Add(NewObj);
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479 | end;
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480 |
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481 | procedure TMetaCanvas.DoRectangleFill(const Bounds: TRect);
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482 | var
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483 | NewObj: TCanvasRectangle;
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484 | begin
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485 | NewObj := TCanvasRectangle.Create;
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486 | NewObj.Brush.Assign(Brush);
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487 | NewObj.Pen.Assign(Pen);
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488 | NewObj.BoundingRect := Bounds;
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489 | Objects.Add(NewObj);
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490 | end;
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491 |
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492 | procedure TMetaCanvas.Polygon(Points: PPoint; NumPts: Integer; Winding: boolean
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493 | );
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494 | var
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495 | APoints: array of TPoint;
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496 | I: Integer;
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497 | begin
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498 | SetLength(APoints, NumPts);
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499 | for I := 0 to High(APoints) do
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500 | APoints[I] := Points[I];
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501 | DoPolygon(APoints);
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502 | end;
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503 |
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504 | procedure TMetaCanvas.DoPolygon(const Points: array of TPoint);
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505 | var
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506 | NewObj: TCanvasPolygon;
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507 | I: Integer;
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508 | begin
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509 | NewObj := TCanvasPolygon.Create;
|
---|
510 | NewObj.Brush.Assign(Brush);
|
---|
511 | NewObj.Pen.Assign(Pen);
|
---|
512 | SetLength(NewObj.Points, Length(Points));
|
---|
513 | for I := 0 to High(Points) do
|
---|
514 | NewObj.Points[I] := Points[I];
|
---|
515 | Objects.Add(NewObj);
|
---|
516 | end;
|
---|
517 |
|
---|
518 | procedure TMetaCanvas.CreateHandle;
|
---|
519 | begin
|
---|
520 | end;
|
---|
521 |
|
---|
522 | procedure TMetaCanvas.Ellipse(x1, y1, x2, y2: Integer);
|
---|
523 | begin
|
---|
524 | DoEllipse(Rect(X1, Y1, X2, Y2));
|
---|
525 | end;
|
---|
526 |
|
---|
527 | procedure TMetaCanvas.DoEllipse(const Bounds: TRect);
|
---|
528 | var
|
---|
529 | NewObj: TCanvasEllipse;
|
---|
530 | begin
|
---|
531 | NewObj := TCanvasEllipse.Create;
|
---|
532 | NewObj.Brush.Assign(Brush);
|
---|
533 | NewObj.Pen.Assign(Pen);
|
---|
534 | NewObj.BoundingRect := Bounds;
|
---|
535 | Objects.Add(NewObj);
|
---|
536 | end;
|
---|
537 |
|
---|
538 | procedure TMetaCanvas.StretchDraw(const DestRect: TRect; SrcGraphic: TGraphic);
|
---|
539 | var
|
---|
540 | NewObj: TCanvasStretchDraw;
|
---|
541 | begin
|
---|
542 | NewObj := TCanvasStretchDraw.Create;
|
---|
543 | NewObj.SrcGraphic := SrcGraphic;
|
---|
544 | NewObj.DestRect := DestRect;
|
---|
545 | Objects.Add(NewObj);
|
---|
546 | end;
|
---|
547 |
|
---|
548 | function TMetaCanvas.TextExtent(const Text: string): TSize;
|
---|
549 | begin
|
---|
550 | Result := Size(0, 0);
|
---|
551 | end;
|
---|
552 |
|
---|
553 | procedure TMetaCanvas.DoMoveTo(X, Y: Integer);
|
---|
554 | begin
|
---|
555 | FPenPos := Point(X, Y);
|
---|
556 | end;
|
---|
557 |
|
---|
558 | procedure TMetaCanvas.DoLineTo(X, Y: Integer);
|
---|
559 | begin
|
---|
560 | DoLine(FPenPos.X, FPenPos.Y, X, Y);
|
---|
561 | DoMoveTo(X, Y);
|
---|
562 | end;
|
---|
563 |
|
---|
564 | procedure TMetaCanvas.Pie(EllipseX1, EllipseY1, EllipseX2, EllipseY2, StartX,
|
---|
565 | StartY, EndX, EndY: Integer);
|
---|
566 | var
|
---|
567 | NewObj: TCanvasPie;
|
---|
568 | begin
|
---|
569 | NewObj := TCanvasPie.Create;
|
---|
570 | NewObj.Brush.Assign(Brush);
|
---|
571 | NewObj.Pen.Assign(Pen);
|
---|
572 | NewObj.BoundingRect := Rect(EllipseX1, EllipseY1, EllipseX2, EllipseY2);
|
---|
573 | NewObj.StartPoint := Point(StartX, StartY);
|
---|
574 | NewObj.EndPoint := Point(EndX, EndY);
|
---|
575 | Objects.Add(NewObj);
|
---|
576 | end;
|
---|
577 |
|
---|
578 | procedure TMetaCanvas.SetSize(Size: TPoint);
|
---|
579 | begin
|
---|
580 | FSize := Size;
|
---|
581 | end;
|
---|
582 |
|
---|
583 | procedure TMetaCanvas.Reset;
|
---|
584 | begin
|
---|
585 | Objects.Count := 0;
|
---|
586 | end;
|
---|
587 |
|
---|
588 | procedure TMetaCanvas.DrawTo(Canvas: TCanvas);
|
---|
589 | var
|
---|
590 | I: Integer;
|
---|
591 | begin
|
---|
592 | for I := 0 to Objects.Count - 1 do
|
---|
593 | TCanvasObject(Objects[I]).Paint(Canvas);
|
---|
594 | end;
|
---|
595 |
|
---|
596 | procedure TMetaCanvas.Zoom(Factor: Double);
|
---|
597 | var
|
---|
598 | I: Integer;
|
---|
599 | begin
|
---|
600 | for I := 0 to Objects.Count - 1 do
|
---|
601 | TCanvasObject(Objects[I]).Zoom(Factor);
|
---|
602 | end;
|
---|
603 |
|
---|
604 | procedure TMetaCanvas.Move(Delta: TPoint);
|
---|
605 | var
|
---|
606 | I: Integer;
|
---|
607 | begin
|
---|
608 | for I := 0 to Objects.Count - 1 do
|
---|
609 | TCanvasObject(Objects[I]).Move(Delta);
|
---|
610 | end;
|
---|
611 |
|
---|
612 | constructor TMetaCanvas.Create;
|
---|
613 | begin
|
---|
614 | inherited;
|
---|
615 | FPenPos := Point(0, 0);
|
---|
616 | Objects := TObjectList.Create;
|
---|
617 | end;
|
---|
618 |
|
---|
619 | destructor TMetaCanvas.Destroy;
|
---|
620 | begin
|
---|
621 | Objects.Free;
|
---|
622 | inherited Destroy;
|
---|
623 | end;
|
---|
624 |
|
---|
625 | end.
|
---|
626 |
|
---|