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program fpgcanvas;
{$mode objfpc}{$H+}
uses
{$IFDEF UNIX}{$IFDEF UseCThreads}
cthreads,
{$ENDIF}{$ENDIF}
Classes, SysUtils,
fpgfx,
gfxbase,
gui_form,
gfx_imgfmt_bmp;
type
{ TMainForm }
TMainForm = class(TfpgForm)
private
bmp: TfpgImage;
dst: TfpgImage;
protected
procedure HandlePaint; override;
public
procedure AfterCreate; override;
procedure BeforeDestruction; override;
end;
{ TMainForm }
procedure TMainForm.HandlePaint;
var
r: TRect;
fnt: TfpgFont;
y: integer;
c: TfpgColor;
begin
// Enable double buffering. Must be before 'inherited' to prevent form
// clearing itself.
Canvas.BeginDraw;
inherited HandlePaint;
// Testing Rectangles
Canvas.SetColor(clBlack);
r.Top := 5;
r.Left := 60;
r.Right := r.Left + 49;
r.Bottom := r.Top + 49;
Canvas.DrawRectangle(r); // 50x50
r.Left := 120;
r.Right := r.Left + 49;
Canvas.SetLineStyle(2, lsDash);
Canvas.DrawRectangle(r);
r.Left := 180;
r.Right := r.Left + 49;
Canvas.SetColor(clGreen);
Canvas.SetLineStyle(1, lsDot);
Canvas.DrawRectangle(r);
r.Left := 240;
r.Right := r.Left + 49;
Canvas.SetColor(clBlue);
Canvas.SetLineStyle(1, lsSolid);
Canvas.FillRectangle(r);
// Testing line drawing
Canvas.DrawLine(5, 5, 54, 54);
Canvas.SetColor(clBlue);
Canvas.DrawLine(54, 5, 5, 54);
Canvas.SetColor(clRed);
{ Diagonal line }
Canvas.DrawLine(60, 5, 109, 54);
{ Horizontal line }
Canvas.DrawLine(60, 3, 109, 3);
{ Vertical line }
Canvas.DrawLine(58, 5, 58, 54);
// Testing Text and Fonts
y := 60;
Canvas.SetTextColor(clBlack);
Canvas.DrawString(5, y, 'This text must be black and default font (' + fpgApplication.DefaultFont.FontDesc + ')');
Canvas.SetTextColor(clRed);
y := y + Canvas.Font.Height; // fonts are different sizes on differet OS's
Canvas.DrawString(5, y, 'This text must be red.');
Canvas.SetTextColor(clBlack);
y := y + Canvas.Font.Height;
Canvas.DrawString(5, y, 'Russian (UTF-8) text -> Òåñò');
y := y + Canvas.Font.Height;
fnt := fpgApplication.GetFont('Times-14:bold');
Canvas.Font := fnt;
Canvas.DrawString(5, y, 'Font used is ' + Canvas.Font.FontDesc);
y := y + Canvas.Font.Height;
// Testing basic style drawings
Canvas.Font := fpgApplication.DefaultFont;
// Canvas.DrawButtonFace(0, 0, 6, 6, []);
Canvas.DrawString(320, 3, 'DrawButtonFace():');
Canvas.DrawButtonFace(300, 20, 75, 25, []);
Canvas.DrawString(385, 20, '= []');
Canvas.DrawButtonFace(300, 50, 75, 25, [btnIsDefault]);
Canvas.DrawString(385, 50, '= [btnIsDefault]');
Canvas.DrawButtonFace(300, 80, 75, 25, [btnIsPressed]);
Canvas.DrawString(385, 80, '= [btnIsPressed]');
Canvas.DrawButtonFace(300, 110, 75, 25, [btnIsEmbedded, btnIsPressed]);
Canvas.DrawString(385, 110, '= [embed & press]');
Canvas.DrawButtonFace(300, 140, 75, 25, [btnIsEmbedded]);
Canvas.DrawString(385, 140, '= [btnIsEmbedded]');
Canvas.DrawString(45, y, 'DrawControlFrame():');
y := y + Canvas.Font.Height;
Canvas.DrawControlFrame(5, y, 200, 23);
// Canvas.DrawControlFrame(0, 0, 5, 5);
// Testing Bitmap painting
Canvas.DrawString(5, 180, 'Single BMP file:');
Canvas.DrawString(300, 210, '(mask enabled for all images)');
Canvas.DrawImage(150, 180, bmp);
Canvas.DrawString(5, 210, 'Parts of BMP file:');
Canvas.DrawImagePart(150, 210, bmp, 0, 0, 32, 21);
Canvas.DrawImagePart(190, 210, bmp, 32, 0, 32, 21);
Canvas.DrawImagePart(230, 210, bmp, 64, 0, 32, 21);
// Canvas.StretchDraw(150, 240, 160, 21, bmp);
Canvas.StretchDraw(150, 240, 300, 50, bmp);
Canvas.DrawImage(150, 300, dst);
Canvas.StretchDraw(180, 300, 70, 70, dst);
Canvas.StretchDraw(265, 300, 230, 25, bmp);
// testing accuracy of line/rectangle drawing
Canvas.SetColor(clBlack);
Canvas.SetLineStyle(1, lsSolid);
r.Top := 302;
r.Left := 182;
r.Right := r.Left + 66;
r.Bottom := r.Top + 66;
Canvas.DrawRectangle(r);
Canvas.SetColor(clBlue);
Canvas.DrawLine(183, 303, 247, 303);
// Testing Canvas.Pixels[]
// two pixels should have changed color in the top left of the form
Canvas.Pixels[7,5] := clBlue; // This tests consistant bit order handling (RGB)
Canvas.Pixels[8,5] := clRed;
c := Canvas.Pixels[192, 227]; // should be orange like color
Canvas.Pixels[9,5] := c;
c := Canvas.Pixels[150 + (32*4) + 3, 199]; // should be lightblue like color
Canvas.Pixels[10,5] := c;
// Arc drawing tests
Canvas.SetColor(clBlack);
Canvas.DrawRectangle(5, 235, 55, 285);
Canvas.SetColor(clRed);
Canvas.DrawArc(5, 235, 50, 50, 0, 270); // should overlap rectangle pixels
Canvas.SetColor(clBlack);
Canvas.DrawRectangle(5, 290, 55, 340);
Canvas.SetColor(clRed);
Canvas.FillArc(5, 290, 50, 50, 0, 270); // should overlap rectangle pixels
Canvas.EndDraw;
end;
procedure TMainForm.AfterCreate;
begin
inherited AfterCreate;
SetPosition(100, 100, 500, 400);
WindowTitle := 'fpGFX Canvas Test';
bmp := LoadImage_BMP('button.bmp');
if not Assigned(bmp) then
raise Exception.Create('Failed to load button.bmp');
bmp.CreateMaskFromSample(0,0);
bmp.UpdateImage;
// dst := TfpgImage.Create;
// dst.AllocateImage(bmp.ColorDepth, 200, 50);
dst := LoadImage_BMP('gears2.bmp');
dst.CreateMaskFromSample(0,0);
dst.UpdateImage;
end;
procedure TMainForm.BeforeDestruction;
begin
dst.Free;
bmp.Free;
inherited BeforeDestruction;
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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