C# LinearGradientBrush 颜色渐变画刷的使用

时间:2012-09-20 14:15来源:未知 作者:小白菜 点击: 148 次

可以通过指定起始的颜色，和结束的颜色进行绘制渐变颜色，也可以给这个画刷指定一个颜色的数组，和颜色位置的数组。这个画刷就会根据这些数组来绘制渐变颜色。

下面是LinearGradientBrush实现的各作实例代码：

1，

 Graphics g = e.Graphics;            LinearGradientBrush brush = new LinearGradientBrush(new Point(0, 0), new Point(10, 10), Color.Red, Color.Blue);            g.FillRectangle(brush, 5, 5, 20, 20);            brush.Dispose();

2，

Graphics g = this.CreateGraphics();            Rectangle rect = new Rectangle(50,50,100,100);            LinearGradientBrush brush = new LinearGradientBrush(rect, Color.Transparent, Color.Transparent, LinearGradientMode.Horizontal);            Color[] colors = new Color[4];            colors[0] = Color.Blue;            colors[1] = Color.Black;            colors[2] =Color.Red;            colors[3] =Color.Yellow;            ColorBlend blend = new ColorBlend();            blend.Positions = new float[] { 0.0f, 0.5f,0.7f, 1.0f };            blend.Colors = colors;            brush.InterpolationColors = blend;            g.FillRectangle(brush, rect);            brush.Dispose();

3，

LinearGradientBrush brush = new LinearGradientBrush(
this.ClientRectangle, Color.White,
Color.Red, LinearGradientMode.Horizontal);
Graphics g = this.CreateGraphics();
// g.FillRectangle(brush, 1, 1, 100, 100);
g.DrawString("Likecs.com", this.Font, brush, 100, 100);
brush.Dispose();

4， LinearGradientBrush brush = new LinearGradientBrush(
this.ClientRectangle, Color.White,
Color.Red, LinearGradientMode.Horizontal);
brush.SetBlendTriangularShape(0.5f); //中间向两边渐变效果
Graphics g = this.CreateGraphics();
g.FillRectangle(brush, 1, 1, 1000, 100);
g.DrawString("Likecs.com", this.Font, brush, 100, 100);

5， LinearGradientBrush brush = new LinearGradientBrush(
this.ClientRectangle, Color.White,
Color.Red, LinearGradientMode.Horizontal);
brush.SetSigmaBellShape(0.2f, 0.2f);//创建基于钟形曲线的渐变过渡过程。
Graphics g = this.CreateGraphics();
g.FillRectangle(brush, 1, 1, 1000, 100);
g.DrawString("Likecs.com", this.Font, brush, 100, 100);

(责任编辑：小白菜)