【文件属性】：
文件名称：GDI+重绘示例-boost电路计算模版——mathcad
文件大小：5.1MB
文件格式：PDF
更新时间：2021-06-09 23:59:48
控件，.NET
51 第三章 GDI+基础
}
private void Form2_Load(object sender, EventArgs e)
{
string[] _colorNames;
_colorNames = System.Enum.GetNames(typeof(KnownColor));
cbbColors.Items.AddRange(_colorNames);
cbbColors.SelectedIndex = 0;
}
protected override void OnPaint(PaintEventArgs e)
{
Pen drawingPen = new Pen(_color, 3);
Rectangle rec = new Rectangle(80, 80, 120, 80);
e.Graphics.DrawRectangle(drawingPen, rec);
Brush brush=new SolidBrush(_color);
e.Graphics.FillRectangle(brush,rec);
drawingPen.Dispose();
base.OnPaint(e);
}
private Color _color = Color.Red;
private void cbbColors_SelectedIndexChanged(object sender,
EventArgs e)
{
KnownColor selectedColor;
selectedColor = (KnownColor)System.Enum.Parse(
typeof(KnownColor), cbbColors.Text);
_color=System.Drawing.Color.FromKnownColor(
selectedColor);
//重绘
this.Invalidate();
}
}
}
运行该窗体，结果如图3.3所示。
图3.3 GDI+重绘示例