freepascal.compiler/packages/fcl-image/examples/drawing.pp

{$mode objfpc}{$h+}
program Drawing;

uses 
  {$IFDEF UNIX}cwstring,{$ENDIF} classes, sysutils, FPImage, FPCanvas, FPImgCanv, FPWritePNG, FPReadPNG;

const
  MyColor : TFPColor = (Red: $7FFF; Green: $0000; Blue: $FFFF; Alpha: alphaOpaque);

procedure DoDraw;

var
  canvas : TFPcustomCAnvas;
  ci,image : TFPCustomImage;
  writer : TFPCustomImageWriter;
  reader : TFPCustomImageReader;

begin
  image := TFPMemoryImage.Create (100,100);
  ci := TFPMemoryImage.Create (20,20);
  Canvas := TFPImageCanvas.Create (image);
  Writer := TFPWriterPNG.Create;
  reader := TFPReaderPNG.Create;
  with TFPWriterPNG(Writer) do
    begin
    indexed := false;
    wordsized := false;
    UseAlpha := false;
    GrayScale := false;
    end;
  try
    ci.LoadFromFile ('pattern.png', reader);
    with Canvas as TFPImageCanvas do
      begin
      brush.FPcolor:=colwhite;
      brush.style:=bsSolid;
      pen.mode := pmCopy;
      pen.style := psSolid;
      pen.width := 1;
      pen.FPColor := colred;
      with pen.FPColor do
        red := red div 4;
      Ellipse (10,10, 90,90);

      pen.style := psDashDot;
      pen.FPColor := colred;
      HashWidth := 10;
      Ellipse (10,10, 90,90);

      with pen.FPColor do
        begin
        red := red div 2;
        green := red div 4;
        blue := green;
        end;
      pen.style := psSolid;

      RelativeBrushImage := true;
      brush.image := ci;
      brush.style := bsimage;
      with brush.FPColor do
        green := green div 2;
      Ellipse (11,11, 89,89);


      brush.style := bsSolid;
      brush.FPColor := MyColor;
      pen.style := psSolid;
      pen.width := 3;
      pen.FPColor := colSilver;
      ellipse (30,35, 70,65);

      pen.width := 1;
      pen.FPColor := colCyan;
      ellipseC (50,50, 1,1);

      end;
      writeln ('Saving to "DrawTest.png" for inspection !');
     image.SaveToFile ('DrawTest.png', writer);
  finally
    Canvas.Free;
    ci.free;
    image.Free;
    writer.Free;
    reader.Free;
  end;
end;

begin
  DoDraw;
end.