c# - 如何从下到上填充C#填充矩形？

Question

我已经绘制了垂直矩形，但我想从下到上填充它。这是我使用的代码

System.Drawing.Drawing2D.LinearGradientBrush linGrBrush = 
    new System.Drawing.Drawing2D.LinearGradientBrush(
           new Point(0, 12),
           new Point(0,2),
           Color.FromArgb(0, 0, 0, 0),
           Color.FromArgb(255, 190, 0, 0));

Pen pen = new Pen(linGrBrush);

e.Graphics.FillRectangle(linGrBrush,groupBox2.Width -50,10, 25,  x);

using (Pen Pen1 = new Pen(Color.BurlyWood, 4))
{
   e.Graphics.DrawRectangle(Pen1, groupBox2.Width -50,10, 25, 200);
}

x 是颜色填充偏移量，填充用于每 2 秒后填充矩形。

Answer 1

我认为你应该调整渐变的起点和终点：

System.Drawing.Drawing2D.LinearGradientBrush linGrBrush = 
         new System.Drawing.Drawing2D.LinearGradientBrush(
               new Point(0, 1),
               new Point(0,0),
               Color.FromArgb(0, 0, 0, 0),
               Color.FromArgb(255, 190, 0, 0));