[英]How to draw rectangle by coordinates of click?
我有pictureBox單擊事件。 我獲得點擊坐標並嘗試繪制圓:
private void pictureMain_Click(object sender, EventArgs e){
MouseEventArgs me = (MouseEventArgs)e;
Point coordinates = me.Location;
int x = coordinates.X;
int y = coordinates.Y;
// Create pen.
Pen blackPen = new Pen(Color.Red, 2);
// Create rectangle for ellipse.
Rectangle rect = new Rectangle(x, y, 50, 50);
g.DrawEllipse(blackPen, rect);
}
但是它不在畫框的坐標(x,y)中繪制圓。 它將圓放置在另一個位置。
嘗試這個:
private void pictureBox1_Click (object sender, EventArgs e)
{
Point ellipseCenter = ((MouseEventArgs) e).Location;
Size ellipseSize = new Size (50, 50);
Point rectPosition = new Point (ellipseCenter.X - ellipseSize.Width / 2, ellipseCenter.Y - ellipseSize.Height / 2);
Rectangle rect = new Rectangle (rectPosition, ellipseSize);
using (Graphics grp = Graphics.FromImage (pictureBox1.Image))
{
grp.DrawEllipse (Pens.Red, rect);
}
pictureBox1.Refresh ();
}
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