private void canvas_Paint(object sender, PaintEventArgs e)
{
SolidBrush backBrush = new SolidBrush(BackColor);
e.Graphics.FillRectangle(backBrush, canvas.ClientRectangle);
backBrush.Dispose();
Rectangle a = new Rectangle(10, 20, 30, 30);
Graphics g = e.Graphics;
for (int i = 0; i < _figures.Count; i++)
{
Figure fig = _figures.getAt(i);
fig.draw(g);
}
if (canvas.Image != null)
{
Rectangle r = canvas.ClientRectangle;
Graphics g1 = e.Graphics;
Graphics g2 = Graphics.FromImage(canvas.Image);
IntPtr dc1 = g1.GetHdc();
IntPtr dc2 = g2.GetHdc();
BitBlt(dc2, 0, 0, r.Width, r.Height,
dc1, 0, 0, 0x00CC0020);
g1.ReleaseHdc(dc1);
g2.ReleaseHdc(dc2);
g2.Dispose();
}
}
private void canvas_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Right)
{
_selectedFigure = null;
for (int i = 0; i < _figures.Count; i++)
{
Figure fig = _figures.getAt(i);
if (fig.ptInRegion(e.X, e.Y))
{
_selectedFigure = fig;
break;
}
}
if (_selectedFigure != null)
{
_selectedFigure.popup(canvas, e.Location);
}
else
{
mainPopup.popup(canvas, e.Location);
}
}
else
{
_selectedFigure = null;
for (int i = 0; i < _figures.Count; i++)
{
Figure fig = _figures.getAt(i);
if (fig.ptInRegion(e.X, e.Y))
{
_selectedFigure = fig;
break;
}
}
if (_selectedFigure != null)
{
_figures.removeFigure(_selectedFigure);
_currentX = e.X;
_currentY = e.Y;
_actionMode = MOVING;
canvas.Invalidate();
return;
}
Graphics g = canvas.CreateGraphics();
Pen aPen = new Pen(Color.Black, 2);
if (whatToDraw == DRAW_RECT)
{
_selectedFigure = new Box(canvas, e.X, e.Y, e.X, e.Y);
_selectedFigure.setPopup(boxPopup);
}
else if (whatToDraw == DRAW_LINE)
{
_selectedFigure = new Line(canvas, e.X, e.Y, e.X, e.Y);
_selectedFigure.setPopup(linePopup);
}
else if (whatToDraw == DRAW_CIRCLE)
{
_selectedFigure = new Circle(canvas, e.X, e.Y, e.X, e.Y);
_selectedFigure.setPopup(circlePopup);
}
else if (whatToDraw == DRAW_POINT)
{
_selectedFigure = new Point(canvas, e.X, e.Y);
_selectedFigure.setPopup(pointPopup);
}
_selectedFigure.draw(g);
bMousePressed = true;
_actionMode = DRAWING;
}
}