如何在 C# 中使用 LinearGradientBrush 绘制精确的渐变？
我正在使用 GDI 在 C# 中绘制这个对象，并且我需要进行精确的像素绘制。但是，这不起作用...我不知道这是否重要，但我正在绘制的对象是 ToolStrip，我正在执行自定义 ToolStrip 渲染。
我在 y 像素 1 处画了一条水平蓝线，在 y 像素 2 处画了一条黄色线，在 y 像素 3 处画了一条红色线。这些不是真实的颜色，只是为了让我看得更清楚。
像这样：
Color cTop1 = Color.FromArgb(255, Color.Blue);
Color cTop2 = Color.FromArgb(255, Color.Yellow);
Color cTop3 = Color.FromArgb(255, Color.Red);
g.DrawLine(new Pen(cTop1), 0, 1, aBounds.Width, 1);
g.DrawLine(new Pen(cTop2), 0, 2, aBounds.Width, 2);
g.DrawLine(new Pen(cTop3), 0, 3, aBounds.Width, 3);
然后，在 y 像素 4 处，我开始用 LinearGradientBrush 填充一个矩形，如下所示：
Rectangle rTop = new Rectangle(0, 3, aBounds.Width, (aBounds.Height / 2) - 4);
Color cTop = Color.FromArgb(245, Color.White);
Color cBottom = Color.FromArgb(222, Color.White);
LinearGradientBrush tGradient = new LinearGradientBrush(rTop, cTop, cBottom, LinearGradientMode.Vertical);
g.FillRectangle(tGradient, rTop);
问题是渐变绘制在红线上方。蓝色和黄色都可以，但是红线应该是RGB=255,0,0，实际上是RGB=255,111,111。
我不明白为什么...我已经在 SmoothingMode、InterpolationMode、CompositionMode、CompositionQuality 中玩过，但我就是无法使其正确...
有什么想法吗？
I'm painting this object in C# using GDI and I need to have precise pixel painting. However, this is not working... I don't know if it matters but the object I'm painting is a ToolStrip, I'm doing a custom ToolStrip render.
I drew a horizontal blue line at y-pixel 1, than a yellow one at y-pixel 2 than a red one at y-pixel 3. These are not real colors it's just for me to see better.
Like this:
Color cTop1 = Color.FromArgb(255, Color.Blue);
Color cTop2 = Color.FromArgb(255, Color.Yellow);
Color cTop3 = Color.FromArgb(255, Color.Red);
g.DrawLine(new Pen(cTop1), 0, 1, aBounds.Width, 1);
g.DrawLine(new Pen(cTop2), 0, 2, aBounds.Width, 2);
g.DrawLine(new Pen(cTop3), 0, 3, aBounds.Width, 3);
Than, at y-pixel 4 I started filling a rectangle with the LinearGradientBrush like this:
Rectangle rTop = new Rectangle(0, 3, aBounds.Width, (aBounds.Height / 2) - 4);
Color cTop = Color.FromArgb(245, Color.White);
Color cBottom = Color.FromArgb(222, Color.White);
LinearGradientBrush tGradient = new LinearGradientBrush(rTop, cTop, cBottom, LinearGradientMode.Vertical);
g.FillRectangle(tGradient, rTop);
The problem is that the gradient is painting above the red line. The blue and yellow ones are ok, but the red line, which should be RGB=255,0,0, it's in fact RGB=255,111,111.
I can't understand why... I've played in SmoothingMode, InterpolationMode, CompositionMode, CompositionQuality but I just can't make it right...
Any ideias?
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画笔可能被包裹，而您看到的是相反的颜色“渗出”。
尝试将包裹模式设置为
It's possible that the brush is being wrapped and what you are seeying is the oposite colour "bleeding" in.
Try and set the wrapmode to