//选择不同椭圆对象时触发的事件
private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
{
foreach (var w in graphicsList)
{
w.PenColor = Color.Red;
}
DrawEllipse dw = graphicsList[listBox1.SelectedIndex];
dw.PenColor = Color.Blue;
panel1.Refresh();
}
//鼠标按下时触发的事件
private void panel1_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
id++;
DrawEllipse w = new DrawEllipse(e.X, e.Y, 1, 1, Color.Red);
graphicsList.Add(w);
listBox1.Items.Add("椭圆对象：" + id.ToString());
panel1.Refresh();
}
}
//鼠标移动时触发的事件
private void panel1_MouseMove(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
if (graphicsList.Count() > 0)
{
//获得泛型列表的最后一个元素
DrawEllipse w = graphicsList.Last();
int x = w.Rect.X;
int y = w.Rect.Y;
w.Rect = new Rectangle(x, y, e.X - x, e.Y - y);
panel1.Refresh();
}
}
}