SetBlendBellShape 方法: 创建基于钟形曲线的渐变过渡过程;

SetBlendTriangularShape 方法: 创建一个从中心色向两端单个颜色线性过渡的线性渐变过程.

两个方法好像区别不大.

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SetBlendBellShape 测试效果图:

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SetBlendTriangularShape 测试效果图:

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SetBlendBellShape 测试代码:

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uses GdiPlus;procedure TForm1.FormPaint(Sender: TObject);
varGraphics: IGPGraphics;Rect: TGPRectF;Brush: IGPLinearGradientBrush;
beginGraphics := TGPGraphics.Create(Canvas.Handle);Rect.Initialize(10, 10, 120, 150);Brush := TGPLinearGradientBrush.Create(Rect, $FFFF0000, $FF0000FF, 0);Brush.SetBlendBellShape(1);Graphics.FillEllipse(Brush, Rect);Brush.SetBlendBellShape(0.8);Graphics.TranslateTransform(Rect.X + Rect.Width, 0);Graphics.FillEllipse(Brush, Rect);Brush.SetBlendBellShape(0.5);Graphics.TranslateTransform(Rect.X + Rect.Width, 0);Graphics.FillEllipse(Brush, Rect);Brush.SetBlendBellShape(0.2);Graphics.TranslateTransform(Rect.X + Rect.Width, 0);Graphics.FillEllipse(Brush, Rect);Brush.SetBlendBellShape(0);Graphics.TranslateTransform(Rect.X + Rect.Width, 0);Graphics.FillEllipse(Brush, Rect);//Graphics.TranslateTransform(-Graphics.Transform.OffsetX, Rect.Y + Rect.Height);Brush.SetBlendBellShape(1, 1);Graphics.FillEllipse(Brush, Rect);Brush.SetBlendBellShape(1, 0.8);Graphics.TranslateTransform(Rect.X + Rect.Width, 0);Graphics.FillEllipse(Brush, Rect);Brush.SetBlendBellShape(1, 0.5);Graphics.TranslateTransform(Rect.X + Rect.Width, 0);Graphics.FillEllipse(Brush, Rect);Brush.SetBlendBellShape(1, 0.2);Graphics.TranslateTransform(Rect.X + Rect.Width, 0);Graphics.FillEllipse(Brush, Rect);Brush.SetBlendBellShape(1, 0);Graphics.TranslateTransform(Rect.X + Rect.Width, 0);Graphics.FillEllipse(Brush, Rect);
end;

SetBlendTriangularShape 测试代码:

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uses GdiPlus;procedure TForm1.FormPaint(Sender: TObject);
varGraphics: IGPGraphics;Rect: TGPRectF;Brush: IGPLinearGradientBrush;
beginGraphics := TGPGraphics.Create(Canvas.Handle);Rect.Initialize(10, 10, 120, 150);Brush := TGPLinearGradientBrush.Create(Rect, $FFFF0000, $FF0000FF, 0);Brush.SetBlendBellShape(1);Graphics.FillEllipse(Brush, Rect);Brush.SetBlendTriangularShape(0.8);Graphics.TranslateTransform(Rect.X + Rect.Width, 0);Graphics.FillEllipse(Brush, Rect);Brush.SetBlendTriangularShape(0.5);Graphics.TranslateTransform(Rect.X + Rect.Width, 0);Graphics.FillEllipse(Brush, Rect);Brush.SetBlendTriangularShape(0.2);Graphics.TranslateTransform(Rect.X + Rect.Width, 0);Graphics.FillEllipse(Brush, Rect);Brush.SetBlendTriangularShape(0);Graphics.TranslateTransform(Rect.X + Rect.Width, 0);Graphics.FillEllipse(Brush, Rect);//Graphics.TranslateTransform(-Graphics.Transform.OffsetX, Rect.Y + Rect.Height);Brush.SetBlendTriangularShape(1, 1);Graphics.FillEllipse(Brush, Rect);Brush.SetBlendTriangularShape(1, 0.8);Graphics.TranslateTransform(Rect.X + Rect.Width, 0);Graphics.FillEllipse(Brush, Rect);Brush.SetBlendTriangularShape(1, 0.5);Graphics.TranslateTransform(Rect.X + Rect.Width, 0);Graphics.FillEllipse(Brush, Rect);Brush.SetBlendTriangularShape(1, 0.2);Graphics.TranslateTransform(Rect.X + Rect.Width, 0);Graphics.FillEllipse(Brush, Rect);Brush.SetBlendTriangularShape(1, 0);Graphics.TranslateTransform(Rect.X + Rect.Width, 0);Graphics.FillEllipse(Brush, Rect);
end;