C# 创建渐变图像

Question

如何使用C#创建一个渐变图像（具有给定的高度和宽度，起始颜色和结束颜色）？有没有简单的代码示例可以提供？谢谢！

- Alex

Answer 1

您可以使用LinearGradientBrush来实现此操作。例如：

// using System.Drawing;
// using System.Drawing.Imaging;
// using System.Drawing.Drawing2D;

public static void OutputGradientImage()
{
    using (Bitmap bitmap = new Bitmap(100, 100)) // 100x100 pixels
    using (Graphics graphics = Graphics.FromImage(bitmap))
    using (LinearGradientBrush brush = new LinearGradientBrush(
        new Rectangle(0, 0, 100, 100),
        Color.Blue,
        Color.Red,
        LinearGradientMode.Vertical))
    {
        brush.SetSigmaBellShape(0.5f);
        graphics.FillRectangle(brush, new Rectangle(0, 0, 100, 100));
        bitmap.Save("gradientImage.jpg", ImageFormat.Jpeg);
    }
}

- Reed Copsey

Answer 2

在这里，LinearGradientBrush是您的朋友：

    Bitmap bmp = new Bitmap(Width, Height);
    Graphics g = Graphics.FromImage(bmp);
    LinearGradientBrush lgb = new LinearGradientBrush(new Point(0, 0), new Point(Width, Height), Color.Black, Color.Red);
    g.FillRectangle(lgb, 0, 0, Width, Height);
    bmp.Save("文件名");
    lgb.Dispose();
    g.Dispose();
    bmp.Dispose();

- Jacob G

Answer 3

protected override void OnPaintBackground(PaintEventArgs e)
{
    using (Brush b = new LinearGradientBrush(ClientRectangle, Color.Red, Color.Blue, LinearGradientMode.ForwardDiagonal))
        e.Graphics.FillRectangle(b, ClientRectangle);
}

这就是你能做到的最简单的方式了。

- csharptest.net