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program drawtest;
{$mode objfpc}{$H+}
uses
{$IFDEF UNIX}{$IFDEF UseCThreads}
cthreads,
{$ENDIF}{$ENDIF}
Classes,
fpg_base,
fpg_main,
fpg_form,
fpg_imgfmt_bmp;
type
TMainForm = class(TfpgForm)
private
img: TfpgImage;
finalimg: TfpgImage;
protected
procedure HandlePaint; override;
procedure HandleShow; override;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
end;
{ TMainForm }
procedure TMainForm.HandlePaint;
var
r: TfpgRect;
begin
Canvas.BeginDraw;
inherited HandlePaint;
Canvas.Clear(clSteelBlue);
Canvas.DrawString(10, 10, 'Original 50x50 image:');
Canvas.DrawImage(200, 10, img);
Canvas.DrawString(10, 60, 'All line and pixel drawing must only appear');
Canvas.DrawString(10, 60+Canvas.Font.Height, 'on black rectangles. Watch for line start and');
Canvas.DrawString(10, 60+(Canvas.Font.Height*2), 'ending points.');
// final image
Canvas.DrawString(10, 195-Canvas.Font.Height, 'The final images should look like this:');
Canvas.DrawImage(100, 200, finalimg);
// blank rectangle image
Canvas.DrawImage(100, 100, img);
// rectangle
Canvas.SetColor(clRed);
Canvas.DrawRectangle(102, 102, 46, 46); // (over second outer black rectangle)
Canvas.SetColor(clMagenta);
Canvas.DrawRectangle(104, 104, 42, 42); // (over third outer black rectangle)
r.SetRect(104, 104, 42, 42);
Canvas.DrawFocusRect(r); // (over third outer magenta rectangle)
// Point (outer 4 corners)
Canvas.Pixels[100, 100] := clBlue;
Canvas.Pixels[149, 100] := clBlue;
Canvas.Pixels[100, 149] := clBlue;
Canvas.Pixels[149, 149] := clBlue;
// FillRect
Canvas.SetColor(clYellow);
Canvas.FillRectangle(111, 111, 28, 28); // inner white rectangle
// line diagonal
Canvas.SetColor(clRed);
Canvas.DrawLine(110, 110, 140, 140); // top/left of inner black rect to bottom/right
Canvas.SetColor(clGreen);
Canvas.DrawLine(139, 110, 109, 140); // top/right of inner black rect to bottom/left
// line vertical
Canvas.SetColor(clBlue);
Canvas.DrawLine(108, 108, 108, 142);
Canvas.DrawLine(141, 108, 141, 142);
// line horizontal
Canvas.SetColor(clGreen);
Canvas.DrawLine(106, 106, 144, 106);
Canvas.DrawLine(106, 143, 144, 143);
Canvas.EndDraw;
end;
procedure TMainForm.HandleShow;
begin
img := LoadImage_BMP('square.bmp');
finalimg := LoadImage_BMP('drawtest.bmp');
inherited HandleShow;
end;
constructor TMainForm.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
WindowTitle := 'Draw test';
SetPosition(100, 100, 300, 300);
end;
destructor TMainForm.Destroy;
begin
img.Free;
finalimg.Free;
inherited Destroy;
end;
procedure MainProc;
var
frm: TMainForm;
begin
fpgApplication.Initialize;
frm := TMainForm.Create(nil);
frm.Show;
fpgApplication.Run;
end;
begin
MainProc;
end.
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