O solve-CodePudding

To create a form, in the form, the left mouse button to pull there will be a red line, the left mouse button to stop, the red line stop,

CodePudding user response:

 private void Form1_MouseMove (object sender, MouseEventArgs e) 
{
If (e.B utton==MouseButtons. Left) 
{
Graphics g=this. CreateGraphics (); 
G.D rawRectangle (new Pen (Color. Red, 1), the new Rectangle (e.X, e.Y, 1, 1)); 
} 
}

CodePudding user response:

WPF word is a form, inside put a canvas and then give a left key press event, when triggered began to draw lines, left key bounce off paint, under the specific code can only be your baidu canvas drawing board, there are a lot of relevant tutorial,

CodePudding user response:

reference 1st floor Bridge_go response:

 private void Form1_MouseMove (object sender, MouseEventArgs e) 
{
If (e.B utton==MouseButtons. Left) 
{
Graphics g=this. CreateGraphics (); 
G.D rawRectangle (new Pen (Color. Red, 1), the new Rectangle (e.X, e.Y, 1, 1)); 
} 
}

See bosses directly on the code, I suddenly think of my reply to lower the level of BBS,

CodePudding user response:

reference 1st floor Bridge_go response:

 private void Form1_MouseMove (object sender, MouseEventArgs e) 
{
If (e.B utton==MouseButtons. Left) 
{
Graphics g=this. CreateGraphics (); 
G.D rawRectangle (new Pen (Color. Red, 1), the new Rectangle (e.X, e.Y, 1, 1)); 
} 
}

Why this code to draw up some intermittent, is the problem that the mouse?

CodePudding user response:

 
Point _lastPoint=new Point (100, 100); 
Private void Form1_MouseMove (object sender, MouseEventArgs e) 
{
If (e.B utton==MouseButtons. Left) 
{
If (_lastPoint.==X - 100) 
{
_lastPoint=new Point (e.X, e.Y); 
} 
Graphics g=this. CreateGraphics (); 
G.D rawLine (new Pen (Color. Red, 1), _lastPoint. X, _lastPoint. J Y, e.X, e.Y); 
_lastPoint=new Point (e.X, e.Y); 
return; 
} 
_lastPoint=new Point (100, 100); 
}

CodePudding user response:

reference 5 floor Bridge_go reply:

 
Point _lastPoint=new Point (100, 100); 
Private void Form1_MouseMove (object sender, MouseEventArgs e) 
{
If (e.B utton==MouseButtons. Left) 
{
If (_lastPoint.==X - 100) 
{
_lastPoint=new Point (e.X, e.Y); 
} 
Graphics g=this. CreateGraphics (); 
G.D rawLine (new Pen (Color. Red, 1), _lastPoint. X, _lastPoint. J Y, e.X, e.Y); 
_lastPoint=new Point (e.X, e.Y); 
return; 
} 
_lastPoint=new Point (100, 100); 
}

感谢

CodePudding user response:

reference 5 floor Bridge_go reply:

 
Point _lastPoint=new Point (100, 100); 
Private void Form1_MouseMove (object sender, MouseEventArgs e) 
{
If (e.B utton==MouseButtons. Left) 
{
If (_lastPoint.==X - 100) 
{
_lastPoint=new Point (e.X, e.Y); 
} 
Graphics g=this. CreateGraphics (); 
G.D rawLine (new Pen (Color. Red, 1), _lastPoint. X, _lastPoint. J Y, e.X, e.Y); 
_lastPoint=new Point (e.X, e.Y); 
return; 
} 
_lastPoint=new Point (100, 100); 
}

Excuse me, what - 100 mean? Are there any special meaning?

CodePudding user response:

No, it is an initial value