我期待在CodeGear的Delphi中繪製一個橢圓混濁2010年繪製橢圓不透明度在Delphi 2010
我曾試圖畫上了另一位圖, 我已經設置了位圖的透明顏色(背景) 呼叫橢圓方法。
而在我的圖片中,我繪製了帶有不透明度參數的位圖(來自過載)。但它不起作用。
我想是這樣的http://www.java2s.com/Tutorial/VBImages/WPF-UseOpacityMaskAndRadialGradientBrush.PNG
有誰知道的工作方法?
我期待在CodeGear的Delphi中繪製一個橢圓混濁2010年繪製橢圓不透明度在Delphi 2010
我曾試圖畫上了另一位圖, 我已經設置了位圖的透明顏色(背景) 呼叫橢圓方法。
而在我的圖片中,我繪製了帶有不透明度參數的位圖(來自過載)。但它不起作用。
我想是這樣的http://www.java2s.com/Tutorial/VBImages/WPF-UseOpacityMaskAndRadialGradientBrush.PNG
有誰知道的工作方法?
它爲我的作品:
procedure TForm1.Button1Click(Sender: TObject);
var
bm1, bm2: TBitmap;
begin
bm1 := TBitmap.Create;
bm1.LoadFromFile('C:\Users\Andreas Rejbrand\Pictures\portrait.bmp');
bm2 := TBitmap.Create;
bm2.SetSize(bm1.Width, bm1.Height);
bm2.Canvas.Brush.Color := clRed;
bm2.Canvas.Pen.Style := psClear;
bm2.Canvas.Ellipse(0, 0, bm2.Width, bm2.Height);
Canvas.Draw(100, 100, bm1);
Canvas.Draw(100, 100, bm2, 127);
end;
Sample 1 http://privat.rejbrand.se/blendimg1.png
如果你想要更多的控制,你可以隨時手動進行處理:
procedure TForm1.Button1Click(Sender: TObject);
type
TRGB32Array = packed array[0..MaxInt div SizeOf(TRGBQuad)-1] of TRGBQuad;
PRGB32Array = ^TRGB32Array;
TScanline = TRGB32Array;
PScanline = ^TScanline;
var
bm1, bm2, bm3: TBitmap;
sc1, sc2, sc3: PScanline;
i: Integer;
j: Integer;
var
transp: real;
const
opacity = 0.29;
begin
transp := 1 - opacity;
bm1 := TBitmap.Create;
bm1.LoadFromFile('C:\Users\Andreas Rejbrand\Pictures\portrait.bmp');
bm2 := TBitmap.Create;
bm2.SetSize(bm1.Width, bm1.Height);
bm2.Canvas.Brush.Color := clRed;
bm2.Canvas.Pen.Style := psClear;
bm2.Canvas.Ellipse(0, 0, bm2.Width, bm2.Height);
bm3 := TBitmap.Create;
bm3.SetSize(bm1.Width, bm1.Height);
bm1.PixelFormat := pf32bit;
bm2.PixelFormat := pf32bit;
bm3.PixelFormat := pf32bit;
for i := 0 to bm1.Height - 1 do
begin
sc1 := bm1.ScanLine[i];
sc2 := bm2.ScanLine[i];
sc3 := bm3.ScanLine[i];
for j := 0 to bm1.Width - 1 do
with sc3^[j] do
begin
rgbBlue := round(transp*sc1^[j].rgbBlue + opacity*sc2^[j].rgbBlue);
rgbGreen := round(transp*sc1^[j].rgbGreen + opacity*sc2^[j].rgbGreen);
rgbRed := round(transp*sc1^[j].rgbRed + opacity*sc2^[j].rgbRed);
end;
end;
Canvas.Draw(100, 100, bm3);
end;
Sample 2 http://privat.rejbrand.se/blendimg2.png
您可以爲例如讓背景圖像處於100%不透明狀態橢圓外側y:
...
for i := 0 to bm1.Height - 1 do
begin
sc1 := bm1.ScanLine[i];
sc2 := bm2.ScanLine[i];
sc3 := bm3.ScanLine[i];
for j := 0 to bm1.Width - 1 do
if sc2^[j].rgbBlue + sc2^[j].rgbGreen + sc2^[j].rgbRed = 3*255 then
sc3^[j] := sc1^[j]
else
with sc3^[j] do
begin
rgbBlue := round(transp*sc1^[j].rgbBlue + opacity*sc2^[j].rgbBlue);
rgbGreen := round(transp*sc1^[j].rgbGreen + opacity*sc2^[j].rgbGreen);
rgbRed := round(transp*sc1^[j].rgbRed + opacity*sc2^[j].rgbRed);
end;
end;
...
Sample 3 http://privat.rejbrand.se/blendimg3.png
且不說all other cool stuff you can do with pixmap manipulation:
...
for i := 0 to bm1.Height - 1 do
begin
sc1 := bm1.ScanLine[i];
sc2 := bm2.ScanLine[i];
sc3 := bm3.ScanLine[i];
for j := 0 to bm1.Width - 1 do
if sc2^[j].rgbBlue + sc2^[j].rgbGreen + sc2^[j].rgbRed = 3*255 then
sc3^[j] := sc1^[j]
else
with sc3^[j] do
begin
rgbBlue := round(sin(transp*sc1^[j].rgbBlue + opacity*sc2^[j].rgbBlue));
rgbGreen := round(transp*sc1^[j].rgbGreen + opacity*sc2^[j].rgbGreen);
rgbRed := round(transp*sc1^[j].rgbRed + opacity*sc2^[j].rgbRed);
end;
end;
...
Sample 4 http://privat.rejbrand.se/blendimg4.png
如果你真的不想做手工,我只是想出了,可以在第一個位圖的副本上繪製橢圓,然後混合這兩個位圖:
procedure TForm1.Button1Click(Sender: TObject);
var
bm1, bm2: TBitmap;
begin
bm1 := TBitmap.Create;
bm1.LoadFromFile('C:\Users\Andreas Rejbrand\Pictures\portrait.bmp');
bm2 := TBitmap.Create;
bm2.LoadFromFile('C:\Users\Andreas Rejbrand\Pictures\portrait.bmp');
bm2.Canvas.Brush.Color := clRed;
bm2.Canvas.Pen.Style := psClear;
bm2.Canvas.Ellipse(0, 0, bm2.Width, bm2.Height);
Canvas.Draw(100, 100, bm1);
Canvas.Draw(100, 100, bm2, 127);
end;
+1更妙的是,如果這是可以做到抗鋸齒! – 2011-02-07 01:06:24