C# (CSharp) SplashScreen.CreateGraphics示例

示例#1

 private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
 {
     if (!start)
     {
         if (e.Button == MouseButtons.Left)
         {
             p0 = e.Location;
         }
         SplashScreen.Refresh();
         start = true;
     }
     else
     {
         if (SplashScreen.Image == null)
         {
             return;
         }
         if (e.Button == MouseButtons.Left)
         {
             SplashScreen.Refresh();
             p1 = e.Location;
             SplashScreen.CreateGraphics().DrawRectangle(selectPen, RectByTwoPoints(p0, e.Location));
         }
         start = false;
         PrepareBitmap();
         this.Close();
     }
 }

示例#2

 private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
 {
     if (SplashScreen.Image == null)
     {
         return;
     }
     if (start)
     {
         SplashScreen.Refresh();
         SplashScreen.CreateGraphics().DrawRectangle(selectPen, RectByTwoPoints(p0, e.Location));
     }
 }

示例#3

 private void SplashScreen_MouseUp(object sender, MouseEventArgs e)
 {
     if (e.Button == MouseButtons.Left && start == true && p0 != e.Location && SplashScreen.Image != null)
     {
         SplashScreen.Refresh();
         p1 = e.Location;
         SplashScreen.CreateGraphics().DrawRectangle(selectPen, RectByTwoPoints(p0, e.Location));
         start = false;
         PrepareBitmap();
         this.Close();
     }
 }