TAgg2D.Parallelogram(x1, y1, x2, y2, para)

Description

Transforms source coordinates system rectangle into the destination parallelogram. Parallelogram transformation preserves orientations and changes ratios, angles and distances.

Parameters

x1: double

X coordinate of Top Left corner of source rectangle [in subpixels].

y1: double

Y coordinate of Top Left corner of source rectangle [in subpixels].

x2: double

X coordinate of Bottom Right corner of source rectangle [in subpixels].

y2: double

Y coordinate of Bottom Right corner of source rectangle [in subpixels].

para: PDouble

Pointer to the first element of an array containing six values defining the destination parallelogram [in subpixels].

Individual corners of parallelogram are in this order: Top Left (x,y), Top Right (x,y) and Bottom Right (x,y). The fourth corner (Bottom Left) is internally computed from the three others.

Example

if VG.Attach(Image1.Picture.Bitmap) then begin

  VG.ClearAll(255, 255, 255);
  VG.NoFill;

  // First rectangle
  VG.Rectangle(40, 40, 150, 150);

  // Define destination parallelogram
  para[1] := 50;
  para[2] := 50;
  para[3] := 150;
  para[4] := 50;
  para[5] := 220;
  para[6] := 150;

  // Parallelogram transformation 
  VG.Parallelogram(0, 0, ClientWidth, ClientHeight, @para[1 ]);

  // The same rectangle in a new parallelogram coordinates
  VG.LineColor($FF, $00, $00);
  VG.Rectangle(40, 40, 150, 150);

end;