// Xoa hinh dang ve
private void Xoa()
{
if (flag)
{
HDC hdc = (HDC)User.GetDC(panel1.Handle);
if (m_Shape.ToString() == "CPolygon" && m_arrPoint != null)
{
POINT[] t = new POINT[2];
t[0].x = m_arrPoint[0].x - distance;
t[0].y = m_arrPoint[0].y - distance;
t[1].x = m_arrPoint[0].x + distance;
t[1].y = m_arrPoint[0].y + distance;
CRectangle rec = new CRectangle(t[0], t[1]);
rec.SetDrawMode(GDI.R2_NOTXORPEN);
rec.Draw(hdc);
POINT[] t1 = new POINT[2];
t1[1] = m_arrPoint[0];
CLine line = new CLine();
Gan(line);
for (int i = 1; i < m_arrPoint.Length; ++i)
{
// Ve duong thang
t1[0] = t1[1];
t1[1] = m_arrPoint[i];
line.SetPoints(t1);
line.Draw(hdc);
// Ve o vuong nho tai cac dinh
t[0].x = m_arrPoint[i].x - distance;
t[0].y = m_arrPoint[i].y - distance;
t[1].x = m_arrPoint[i].x + distance;
t[1].y = m_arrPoint[i].y + distance;
rec.SetPoints(t);
rec.Draw(hdc);
}
// Ve duong thang
t1[0] = t1[1];
t1[1] = m_End;
line.SetPoints(t1);
line.Draw(hdc);
}
else
{
m_Shape.Draw(hdc);
}
User.ReleaseDC(panel1.Handle, hdc);
}
}
private void Form1_MouseDown(object sender, MouseEventArgs e)
{
m_End.X = e.X;
m_End.Y = e.Y;
flag = !flag;
if (flag) // bat dau ve
{
m_Start.X = e.X;
m_Start.Y = e.Y;
}
else
{
// Chuyen toa do 2 diem thanh mang cac diem
Point[] T = new Point[2];
T[0] = m_Start;
T[1] = m_End;
// Them tham so cho hinh can ve
m_Shape.SetPoints(T);
m_Shape._Color = m_Color;
m_Shape.Fill = m_Fill;
// Ve
Graphics grImage = Graphics.FromImage(bmpNew);
Graphics gr = this.CreateGraphics();
m_Shape.Draw(gr); // ve len man hinh
m_Shape.Draw(grImage); // ve len anh (trong vung nho)
gr.Dispose();
grImage.Dispose();
// Them hinh vao tap hop
m_arrShape.Add(m_Shape);
switch (m_Shape.ToString())
{
case "CLine":
m_Shape = new CLine();
break;
case "CEllipse":
m_Shape = new CEllipse();
break;
}
}
}