thanks dude.. you're a big help..
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Mouse Over a Drawn Rectangle
im working on a test application where on form load, a rotated rectangle will be drawn on panel control.. now, i want to add an event to that rectangle, a mouse hover event.. i want to change the color of the rectangle whenever the mouse moves over it.. and i also want to add a click event to that rectangle.. thanks..
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by: Erick37Posted on 2005-09-24 at 20:22:19ID: 14952777
Try this...
using System.Drawing;
using System.Drawing.Drawing2D;
// ...
// define the rectangle
private Rectangle rc = new Rectangle(20, 20, 40, 40);
// calculate center of rectangle
private int cx = 40; // rc.Left + (rc.Width / 2)
private int cy = 40; // rc.Top + (rc.Height / 2)
// our matrix
Matrix m = new Matrix();
// is the mouse in the rectangle?
private bool inRect;
private void panel1_Paint(object sender, PaintEventArgs e) // Panel paint event
{
// transform matrix
e.Graphics.Transform = m;
// draw either a filled or empty rectangle
if (inRect)
{
e.Graphics.FillRectangle(B
e.Graphics.DrawRectangle(P
}
else
{
e.Graphics.DrawRectangle(P
}
}
private void panel1_MouseMove(object sender, MouseEventArgs e) // panel mousemove event
{
bool bTest;
// make a point array out of the current mouse position
Point[] pt = {new Point(e.X, e.Y)};
// copy and invert matrix
Matrix mi;
mi = m.Clone();
mi.Invert();
// rotate adjust the mouse coords
mi.TransformPoints(pt);
// test to see if the rotated coords are in the rotated rect
bTest = rc.Contains(pt[0].X, pt[0].Y);
// Console.WriteLine("inRect = " + bTest.ToString());
if (inRect != bTest)
{
// something changed
panel1.Invalidate();
}
// save the result
inRect = rc.Contains(pt[0].X, pt[0].Y);
}
private void Form1_Load(object sender, EventArgs e) // form load event
{
// define the rotation at 35 degrees at the center of the rectangle
m.RotateAt(35, new Point(cx, cy));
}