GDI+ 學習記錄(25): 變換 – Transform

//比例變化var  g: TGPGraphics;  p: TGPPen;  rect: TGPRect;begin  g := TGPGraphics.Create(Canvas.Handle);  p := TGPPen.Create(MakeColor(255,255,0,0),0);  rect := MakeRect(10,10,100,100);  g.DrawRectangle(p, rect); {原始}  g.ScaleTransform(2, 0.5); {橫向放大、縱向縮小}  p.SetColor(aclBlue);      {變個顏色看清楚}  g.DrawRectangle(p, rect); {重繪}  g.ResetTransform;         {恢複變化, 不然下一個變化將基於現在的狀態}  p.Free;  g.Free;end;//角度變化(旋轉)var  g: TGPGraphics;  p: TGPPen;  rect: TGPRect;begin  g := TGPGraphics.Create(Canvas.Handle);  p := TGPPen.Create(MakeColor(255,255,0,0),0);  rect := MakeRect(10,10,100,100);  g.DrawRectangle(p, rect);  g.RotateTransform(28); {旋轉28度角, 正值順時針、負值逆時針}  p.SetColor(aclBlue);  g.DrawRectangle(p, rect);  g.ResetTransform;  p.Free;  g.Free;end;//位置變化(移動)var  g: TGPGraphics;  p: TGPPen;  rect: TGPRect;begin  g := TGPGraphics.Create(Canvas.Handle);  p := TGPPen.Create(MakeColor(255,255,0,0),0);  rect := MakeRect(10,10,100,100);  g.DrawRectangle(p, rect);  g.TranslateTransform(111,111); {移動}  p.SetColor(aclBlue);  g.DrawRectangle(p, rect);  g.ResetTransform;  p.Free;  g.Free;end;