Bitmap bitmap;//申明为类成员
Graphics graph;
private void createImage()
{//调用的时候先调用createImage方法
bitmap=new Bitmap(this.Width,this.Height);
graph=new Graphics.FromImage(bitmap);
}
private void updateImage()
{
bitmap=new Bitmap(this.Width,this.Height);//问题在于为什么一定要在此处对bitmap重新new，
//如果不重新new就显示不出线条
graph=new Graphics.FromImage(bitmap);
graph.DrawLine(pen,0,2,20,50);
this.BackgroundImage=bitmap;
}
//如果这样写就不会有图形
private void updateImage()
{
graph.DrawLine(pen,0,2,20,50);
this.BackgroundImage=bitmap;
}
private Bitmap bitmap;
private Graphics graph;
private Pen penWave = new Pen(Color.Lime);
private Pen penGrid = new Pen(Color.Gray);
protected override void OnLoad(EventArgs e)
{
//打开双缓冲，防止闪烁
DoubleBuffered = true;
canvas_height = base.ClientSize.Height;
canvas_width = base.ClientSize.Width;
bitmap = new Bitmap(this.Width, this.Height);
graph = Graphics.FromImage(bitmap);
DrawGrids(ref graph);
this.BackgroundImage = bitmap;
}
protected override void OnResize(EventArgs e)
{
canvas_height = base.ClientSize.Height;
canvas_width = base.ClientSize.Width;
bitmap = new Bitmap(this.Width, this.Height);
graph = Graphics.FromImage(bitmap);
DrawGrids(ref graph);
DrawDot(ref graph);
this.BackgroundImage = bitmap;
}
private void DrawGrids(ref Graphics g)
{//画网格
//pos，canvas_height都是变量，不重复贴了，不影响整体
g.DrawLine(penGrid, pos, 0, pos, canvas_height);//基本上都是这种代码，不重复贴，没做别的处理
}
private void DrawWave(ref Graphics g)
{
graph.DrawLine(penWave,0,2,20,50);//基本上都是这种，两点之间连线的，不重复贴代码了
}
//调用的时候，会先调用这个CreateImage()方法，再调用UpdateImage
//CreateImage只调用一次，UpdateImage会调用多次
public void CreateImage()
{
bitmap=new Bitmap(this.Width,this.Height);
graph=new Graphics.FromImage(bitmap);
}
public void UpdateImage()
{//经过反复试验，在这个方法里必须要对bitmap重新new，否则看不到两点间的连线
bitmap = new Bitmap(this.Width, this.Height);
graph = Graphics.FromImage(bitmap);
DrawDot(ref graph);
this.BackgroundImage = bitmap;
}
private void Form1_Load(object sender, EventArgs e)
{
gridCanvas.CreateImage();//调用的是类里的方法
}
//以下方法被执行
private void receive()
{
gridCanvas.UpdateImage();
}
private Bitmap bitmap;
private Graphics graph;
private Pen penWave = new Pen(Color.Lime);
private Pen penGrid = new Pen(Color.Gray);
protected override void OnLoad(EventArgs e)
{
//打开双缓冲，防止闪烁
DoubleBuffered = true;
canvas_height = base.ClientSize.Height;
canvas_width = base.ClientSize.Width;
CreateImage();
DrawGrids(ref graph);
this.BackgroundImage = bitmap;
}
protected override void OnResize(EventArgs e)
{
canvas_height = base.ClientSize.Height;
canvas_width = base.ClientSize.Width;
this.Refresh();
}
private void DrawGrids()
{//画网格
//pos，canvas_height都是变量，不重复贴了，不影响整体
graph.DrawLine(penGrid, pos, 0, pos, canvas_height);//基本上都是这种代码，不重复贴，没做别的处理
}
private void DrawWave()
{
graph.DrawLine(penWave,0,2,20,50);//基本上都是这种，两点之间连线的，不重复贴代码了
}
//调用的时候，会先调用这个CreateImage()方法，再调用UpdateImage
//CreateImage只调用一次，UpdateImage会调用多次
public void CreateImage()
{
bitmap=new Bitmap(this.Width,this.Height);
graph=new Graphics.FromImage(bitmap);
}
public void UpdateImage()
{//经过反复试验，在这个方法里必须要对bitmap重新new，否则看不到两点间的连线
DrawDot();
this.Refresh();
}
private void updateImage()
{
graph.DrawLine(pen,0,2,20,50);
this.BackgroundImage=bitmap;
}
private void updateImage()
{
graph.DrawLine(pen,0,2,20,50);
this.BackgroundImage=bitmap;
OnBackgroundImageChanged(new EventArgs());
}
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