C# GDI+绘图 为什么会有重影?
private void button1_Click(object sender, EventArgs e)
{
int height = 400, width = 600;
Bitmap image = new Bitmap(height, width);
Graphics g = Graphics.FromImage(image);//创建一个对象
g.Clear(Color.White);
Pen mypen = new Pen(new SolidBrush(Color.Blue), 1);
g.DrawLine(mypen, 100, 80, 100, 340);
this.panel1.BackgroundImage = image;
}
就是上面这样一段简单的代码,预期是画出一条竖线,可是它却出现了两条,第一次尝试GDI+,求解
------解决方案--------------------设置panel1的backgroundimagelayout属性,如果是tile,图像会平铺,看上去像两条。
------解决方案--------------------
可以考虑采用“双缓存”技术:
private void button1_Click(object sender, EventArgs e)
{
//int height = 400, width = 600;
//Bitmap image = new Bitmap(height, width);
Bitmap image = new Bitmap(DisplayRectangle.Width, DisplayRectangle.Height);
using (Graphics g = Graphics.FromImage(image))
{
g.Clear(Color.White);
Pen mypen = new Pen(new SolidBrush(Color.Blue), 1);
g.DrawLine(mypen, 100, 80, 100, 340);
}
this.panel1.BackgroundImage = image;
}