HatchPen CreateHatchPen(Color color, float width)
{
HatchPen pen = new HatchPen();
// TODO: brush 被谁拥有？会被正确释放么？
pen.Brush = new HatchBrush(HatchStyle.DarkUpwardDiagonal, // WideDownwardDiagonal,
// Color.FromArgb(0, 255, 255, 255),
Color.FromArgb(0, 254, 254, 254),
Color.FromArgb(255, color)
); // back
pen.Pen = new Pen(pen.Brush,
width); // 可修改
return pen;
}
HatchPen CreateHatchPen(Color color, float width)
{
HatchPen pen = new HatchPen();
// TODO: brush 被谁拥有？会被正确释放么？
pen.Brush = new HatchBrush(HatchStyle.DarkUpwardDiagonal, // WideDownwardDiagonal,
// Color.FromArgb(0, 255, 255, 255),
Color.FromArgb(0, 254, 254, 254),
Color.FromArgb(255, color)
); // back
pen.Pen = new Pen(pen.Brush,
width); // 可修改
return(pen);
}
private void LineLayerForm_Paint(object sender, PaintEventArgs e)
{
if (this._transparent == true)
{
return;
}
if (this._panelState == dp2Circulation.PanelState.HilightPanel)
{
if (_targetRect != new Rectangle(0, 0, 0, 0))
{
e.Graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
// 整个背景填充为灰色
using (Brush brush = new SolidBrush(Color.LightGray))
{
e.Graphics.FillRectangle(brush, this.ClientRectangle);
}
using (HatchPen hatch_pen = CreateHatchPen(Color.Blue, 6))
{
Rectangle rectTarget = this.RectangleToClient(_targetRect);
Rectangle rectTargetBorder = rectTarget;
Pen pen = hatch_pen.Pen;
rectTargetBorder.Inflate((int)pen.Width / 2, (int)pen.Width / 2);
using (Brush brush = new SolidBrush(this.BackColor))
{
e.Graphics.FillRectangle(brush, rectTarget);
}
}
// 将 source 位置的线条用背景色擦除
using (Brush brush = new SolidBrush(this.BackColor))
{
Rectangle rectSource = this.RectangleToClient(_sourceRect);
e.Graphics.FillRectangle(brush, rectSource);
}
using (HatchPen hatch_pen = CreateHatchPen(Color.Blue, 6))
{
Rectangle rectSource = this.RectangleToClient(_sourceRect);
Rectangle rectBorder = rectSource;
Pen pen = hatch_pen.Pen;
rectBorder.Inflate((int)pen.Width / 2, (int)pen.Width / 2);
e.Graphics.DrawRectangle(pen, rectBorder);
}
}
}
else if (this._panelState == dp2Circulation.PanelState.HilightForm)
{
// 把 source 区域变成灰色
using (Brush brush = CreateHatchBrush(Color.DarkGray)) // new SolidBrush(Color.LightGray)
{
e.Graphics.FillRectangle(brush, this.RectangleToClient(_sourceRect));
}
}
}
