我在调用panel.Update()后尝试立即绘制到面板时遇到问题。 这是代码:
public void AddAndDraw(double X, double Y){
AddPoint (X, Y);
bool invalidated = false;
if (X > _master.xMaxRange) {
_master.Update ();
invalidated = true;
}
if (Y > _master.yMaxRange) {
_master.Update ();
invalidated = true;
}
if (!invalidated) {
_master.UpdateGraph (this);
} else {
_master.PaintContent ();
}
}
运行此问题时,我只看到已清除的面板,而不是他满足于我试图在.PaintContent() - 方法中绘制。我已经尝试在面板上使用.Invalidate()和.Refresh()而不是.Update()
有关如何解决此问题的任何建议吗?
答案 0 :(得分:0)
您的情况似乎需要PictureBox
。
PBs
非常有趣,因为它们可以显示三个图层:
BackgroundImage
属性Image
属性Paint
事件由于您需要一个固定的轴,并且图形不会一直变化,而且您想要经常更新的点PB
似乎是为您制作的!
根据需要调用这些功能,当点已更改Invalidate()
时调用PictureBox
!
Bitmap GraphBackground = null;
Bitmap GraphImage = null;
Point aPoint = Point.Empty;
private void Form1_Load(object sender, EventArgs e)
{
PictureBox Graph = pictureBox1; // short reference, optional
GraphBackground = new Bitmap(Graph.ClientSize.Width, Graph.ClientSize.Height);
GraphImage = new Bitmap(Graph.ClientSize.Width, Graph.ClientSize.Height);
// intial set up, repeat as needed!
Graph.BackgroundImage = DrawBackground(GraphBackground);
Graph.Image = DrawGraph(GraphImage);
}
Bitmap DrawBackground(Bitmap bmp)
{
using (Graphics G = Graphics.FromImage(bmp) )
{
// my little axis code..
Point c = new Point(bmp.Width / 2, bmp.Height / 2);
G.DrawLine(Pens.DarkSlateGray, 0, c.Y, bmp.Width, c.Y);
G.DrawLine(Pens.DarkSlateGray, c.X, 0, c.X, bmp.Height);
G.DrawString("0", Font, Brushes.Black, c);
}
return bmp;
}
Bitmap DrawGraph(Bitmap bmp)
{
using (Graphics G = Graphics.FromImage(bmp))
{
// do your drawing here
}
return bmp;
}
private void pictureBox1_Paint(object sender, PaintEventArgs e)
{
// make it as fat as you like ;-)
e.Graphics.FillEllipse(Brushes.Red, aPoint.X - 3, aPoint.Y - 3, 7, 7);
}