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program wuline_test;
{$mode objfpc}{$H+}
uses
{$IFDEF UNIX}{$IFDEF UseCThreads}
cthreads,
{$ENDIF}{$ENDIF}
Classes, SysUtils,
fpg_base, fpg_main, fpg_form, fpg_button, math,
fpg_imgfmt_bmp, fpg_wuline, fpg_panel, fpg_radiobutton;
type
{ TMainForm }
TMainForm = class(TfpgForm)
private
{@VFD_HEAD_BEGIN: MainForm}
btnQuit: TfpgButton;
pnlName1: TfpgBevel;
rbSpokes: TfpgRadioButton;
rbLines: TfpgRadioButton;
rbSpiral: TfpgRadioButton;
{@VFD_HEAD_END: MainForm}
procedure btnQuitClicked(Sender: TObject);
procedure DrawSpokes(phase: double);
procedure DrawSpiral;
procedure DrawLines;
procedure RadioButtonChanged(Sender: TObject);
protected
procedure HandlePaint; override;
public
procedure AfterCreate; override;
end;
{@VFD_NEWFORM_DECL}
{ TMainForm }
procedure TMainForm.RadioButtonChanged(Sender: TObject);
begin
RePaint;
end;
procedure TMainForm.HandlePaint;
begin
inherited HandlePaint;
if rbSpokes.Checked then
DrawSpokes(0)
else if rbLines.Checked then
DrawLines
else if rbSpiral.Checked then
DrawSpiral;
end;
procedure TMainForm.btnQuitClicked(Sender: TObject);
begin
Close;
end;
// Generates spokes. Animates them using phase.
procedure TMainForm.DrawSpokes(phase: double);
var
x1, y1, x2, y2: integer;
theta: double;
begin
theta := phase;
while theta < (360+phase) do
begin
x1 := trunc(100.0*cos(theta*3.14/180.0)+355.0);
y1 := trunc(-100.0*sin(theta*3.14/180.0)+155.0);
x2 := trunc(20.0*cos(theta*3.14/180.0)+355.0);
y2 := trunc(-20.0*sin(theta*3.14/180.0)+155.0);
WuLine(Canvas, Point(x1, y1), Point(x2, y2), clBlack);
Canvas.DrawLine(x2-240, y2, x1-240, y1);
theta := theta + 10;
end;
end;
procedure TMainForm.DrawSpiral;
var
Theta: double;
X1, Y1, X2, Y2: integer;
begin
X1 := 300;
Y1 := 100;
Theta := 0;
while Theta < 15 * 3.1415926535 do
begin
X2 := trunc(X1 + Cos(Theta) * Theta);
Y2 := trunc(Y1 + Sin(Theta) * Theta);
WuLine(Canvas, Point(X1, Y1), Point(X2, Y2), clBlack);
Theta := Theta + 0.2;
X1 := X2;
Y1 := Y2;
end;
end;
procedure TMainForm.DrawLines;
begin
WuLine(Canvas, Point(10, 35), Point(280, 180), clBlack);
Canvas.SetColor(clBlack);
Canvas.DrawLine(10, 45, 280, 190);
end;
procedure TMainForm.AfterCreate;
begin
{@VFD_BODY_BEGIN: MainForm}
Name := 'MainForm';
SetPosition(278, 186, 600, 312);
WindowTitle := 'fpGUI Wu Anti-Aliased Line test';
WindowPosition := wpScreenCenter;
Sizeable := False;
btnQuit := TfpgButton.Create(self);
with btnQuit do
begin
Name := 'btnQuit';
SetPosition(500, 280, 90, 24);
Anchors := [anRight,anBottom];
Text := 'Quit';
FontDesc := '#Label1';
ImageName := '';
OnClick := @btnQuitClicked;
end;
pnlName1 := TfpgBevel.Create(self);
with pnlName1 do
begin
Name := 'pnlName1';
SetPosition(436, 8, 156, 76);
end;
rbSpokes := TfpgRadioButton.Create(pnlName1);
with rbSpokes do
begin
Name := 'rbSpokes';
SetPosition(12, 28, 120, 19);
FontDesc := '#Label1';
GroupIndex := 1;
TabOrder := 2;
Text := 'Spokes';
OnChange := @RadioButtonChanged;
end;
rbLines := TfpgRadioButton.Create(pnlName1);
with rbLines do
begin
Name := 'rbLines';
SetPosition(12, 8, 120, 19);
Checked := True;
FontDesc := '#Label1';
GroupIndex := 1;
TabOrder := 1;
Text := 'Lines';
OnChange := @RadioButtonChanged;
end;
rbSpiral := TfpgRadioButton.Create(pnlName1);
with rbSpiral do
begin
Name := 'rbSpiral';
SetPosition(12, 48, 120, 19);
FontDesc := '#Label1';
GroupIndex := 1;
TabOrder := 3;
Text := 'Spiral';
OnChange := @RadioButtonChanged;
end;
{@VFD_BODY_END: MainForm}
end;
{@VFD_NEWFORM_IMPL}
procedure MainProc;
var
frm: TMainForm;
begin
fpgApplication.Initialize;
frm := TMainForm.Create(nil);
try
frm.Show;
fpgApplication.Run;
finally
frm.Free;
end;
end;
begin
MainProc;
end.
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