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unit Unit1;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, Forms, Graphics, StdCtrls, ExtCtrls, Buttons, ColorBox,
LCLIntf, FPCanvas;
type
{ TForm1 }
TForm1 = class(TForm)
Bevel1: TBevel;
Bevel2: TBevel;
Button1: TBitBtn;
cbCosmetic: TCheckBox;
cbAntialiasing: TCheckBox;
FigureCombo: TComboBox;
Label10: TLabel;
Label7: TLabel;
Label8: TLabel;
Label9: TLabel;
BrushColorBox: TColorBox;
PenStyleCombo: TComboBox;
Label1: TLabel;
Label2: TLabel;
PenColorBox: TColorBox;
Label6: TLabel;
BrushStyleCombo: TComboBox;
WidthCombo: TComboBox;
CapsCombo: TComboBox;
JoinCombo: TComboBox;
Label3: TLabel;
Label4: TLabel;
Label5: TLabel;
PaintBox: TPaintBox;
procedure BrushChange(Sender: TObject);
procedure cbAntialiasingChange(Sender: TObject);
procedure FigureComboChange(Sender: TObject);
procedure FormCreate(Sender: TObject);
procedure FormDestroy(Sender: TObject);
procedure PaintBoxPaint(Sender: TObject);
procedure PenChange(Sender: TObject);
private
FPattern: TBitmap;
public
end;
var
Form1: TForm1;
implementation
{$R *.lfm}
uses
TypInfo;
{ TForm1 }
procedure TForm1.cbAntialiasingChange(Sender: TObject);
const
AntialiasingMode: array[TCheckBoxState] of TAntialiasingMode =
(
amOff,
amOn,
amDontCare
);
begin
PaintBox.Canvas.AntialiasingMode := AntialiasingMode[cbAntialiasing.State];
PaintBox.Invalidate;
end;
procedure TForm1.FigureComboChange(Sender: TObject);
begin
PaintBox.Invalidate;
end;
procedure TForm1.BrushChange(Sender: TObject);
begin
if BrushStyleCombo.ItemIndex <> -1 then
PaintBox.Canvas.Brush.Style := TBrushStyle(BrushStyleCombo.ItemIndex);
if PaintBox.Canvas.Brush.Style = bsPattern then
PaintBox.Canvas.Brush.Bitmap := FPattern
else
PaintBox.Canvas.Brush.Bitmap := nil;
PaintBox.Invalidate;
end;
procedure TForm1.FormCreate(Sender: TObject);
const
LineBitsDotted: array[0..7] of Word = ($55, $AA, $55, $AA, $55, $AA, $55, $AA);
var
ps: TPenStyle;
bs: TBrushStyle;
begin
case PaintBox.Canvas.AntialiasingMode of
amDontCare: cbAntialiasing.State := cbGrayed;
amOn: cbAntialiasing.State := cbChecked;
amOff: cbAntialiasing.State := cbUnchecked;
end;
FPattern := TBitmap.Create;
FPattern.SetHandles(CreateBitmap(8, 8, 1, 1, @LineBitsDotted), 0);
PenStyleCombo.Items.BeginUpdate;
for ps := Low(ps) to High(ps) do
PenStyleCombo.Items.Add(GetEnumName(TypeInfo(TPenStyle), Ord(ps)));
PenStyleCombo.Items.EndUpdate;
PenStyleCombo.ItemIndex := 0;
BrushStyleCombo.Items.BeginUpdate;
for bs := Low(bs) to High(bs) do
BrushStyleCombo.Items.Add(GetEnumName(TypeInfo(TBrushStyle), Ord(bs)));
BrushStyleCombo.Items.EndUpdate;
BrushStyleCombo.ItemIndex := 0;
end;
procedure TForm1.FormDestroy(Sender: TObject);
begin
FPattern.Free;
end;
procedure TForm1.PaintBoxPaint(Sender: TObject);
function RandomPoint(R: TRect): TPoint;
begin
Result.x := Random(R.Right - R.Left) + R.Left;
Result.y := Random(R.Bottom - R.Top) + R.Top;
end;
procedure DrawFigure(R: TRect); inline;
var
Points: array of TPoint;
begin
inflateRect(R, -10, -10);
case FigureCombo.ItemIndex of
0: // Line
PaintBox.Canvas.Line(R.TopLeft, R.BottomRight);
1: // PolyLine
begin
SetLength(Points, 4);
Points[0] := R.TopLeft;
Points[1] := RandomPoint(R);
Points[2] := RandomPoint(R);
Points[3] := R.BottomRight;
PaintBox.Canvas.Polyline(Points);
end;
2: // Ellipse
PaintBox.Canvas.Ellipse(R);
3: // Rectangle
begin
PaintBox.Canvas.FillRect(R);
PaintBox.Canvas.Rectangle(R);
end;
4: // Triangle
begin
SetLength(Points, 4);
Points[0] := Point(R.Left, R.Bottom);
Points[3] := Points[0];
Points[1] := Point((R.Left + R.Right) div 2, R.Top);
Points[2] := R.BottomRight;
PaintBox.Canvas.Polygon(Points);
end;
end;
end;
var
i, j: integer;
ColWidth, RowHeight: Integer;
R: TRect;
begin
PaintBox.Canvas.Brush.Color := BrushColorBox.Selected;
ColWidth := PaintBox.Width div 3;
RowHeight := PaintBox.Height div 2;
for i := 0 to 2 do
for j := 0 to 2 do
begin
R := Rect(i * ColWidth, j * RowHeight, (i + 1) * ColWidth, (j + 1) * RowHeight);
DrawFigure(R);
end;
end;
procedure TForm1.PenChange(Sender: TObject);
var
Dashes: array[0..3] of DWord = (3, 7, 8, 6);
begin
if PenStyleCombo.ItemIndex <> -1 then
PaintBox.Canvas.Pen.Style := TPenStyle(PenStyleCombo.ItemIndex);
PaintBox.Canvas.Pen.Color := PenColorBox.Selected;
PaintBox.Canvas.Pen.Width := StrToInt(WidthCombo.Text);
PaintBox.Canvas.Pen.Cosmetic := cbCosmetic.Checked;
PaintBox.Canvas.Pen.EndCap := TPenEndCap(CapsCombo.ItemIndex);
PaintBox.Canvas.Pen.JoinStyle := TPenJoinStyle(JoinCombo.ItemIndex);
PaintBox.Canvas.Pen.SetPattern(Dashes);
PaintBox.Invalidate;
end;
end.
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