平滑線段antialising |
缺席
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poiuyt
一般會員 發表:1 回覆:0 積分:0 註冊:2009-12-23 發送簡訊給我 |
前輩們
有個平滑線段(反鋸齒)的程式速度很慢,請前輩看看如何run得更快些? procedure TComputerGrapicsMainForm.AtialiasClick(Sender: TObject); var X,Y,I,J,ColorValue,Scale:Integer; SubAreaTotalR, SubAreaTotalG, SubAreaTotalB, R,G,B : Integer; begin Scale:=3; //虛擬放大倍數 with TestImage1.Canvas do begin //以實際尺寸畫圖 Pen.Width:=3; Brush.Color:=clYellow; Ellipse(30,30,80,80); MoveTo(20,20);Lineto(80,90); end; with TestImage2.Canvas do begin //以虛擬放大尺寸畫圖 Pen.Width:=3*Scale; Brush.Color:=clYellow; Ellipse(30*Scale,30*Scale,80*Scale,80*Scale); MoveTo(20*Scale,20*Scale);Lineto(80*Scale,90*Scale); end; for Y := 0 to TestImage1.Height - 1 do begin for X := 0 to TestImage1.Width - 1 do begin SubAreaTotalR := 0;SubAreaTotalG := 0; SubAreaTotalB := 0; for I := 0 to Scale-1 do begin for J := 0 to Scale-1 do begin ColorValue:=TestImage2.Canvas.Pixels[(X*Scale) J, (Y*Scale) I]; R := Byte(ColorValue); G := Byte(ColorValue Shr 8); B := Byte(ColorValue Shr 16); SubAreaTotalR := SubAreaTotalR R; SubAreaTotalG := SubAreaTotalG G; SubAreaTotalB := SubAreaTotalB B; end; end; ImageChanged.Canvas.Pixels[X,Y] := RGB(SubAreaTotalr div (Scale*Scale), SubAreaTotalg div (Scale*Scale), SubAreaTotalb div (Scale*Scale)); end; end; end; |
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