/// <summary>
/// 创建一个指定方向的箭头.
/// </summary>
/// <param name="rect">绘制箭头的矩形区域.</param>
/// <param name="arrowDirection">箭头的方向.</param>
/// <returns></returns>
public static GraphicsPath CreateTrackBarThumbPath(Rectangle rect, ThumbArrowDirection arrowDirection)
{
GraphicsPath path = new GraphicsPath();
PointF centerPoint = new PointF(rect.X + rect.Width / 2f, rect.Y + rect.Height / 2f);
float offset = 0;
switch (arrowDirection)
{
case ThumbArrowDirection.Left:
case ThumbArrowDirection.Right:
offset = rect.Width / 2f - 4;
break;
case ThumbArrowDirection.Up:
case ThumbArrowDirection.Down:
offset = rect.Height / 2f - 4;
break;
}
switch (arrowDirection)
{
case ThumbArrowDirection.Left:
path.AddLine(rect.X, centerPoint.Y, rect.X + offset, rect.Y);
path.AddLine(rect.Right, rect.Y, rect.Right, rect.Bottom);
path.AddLine(rect.X + offset, rect.Bottom, rect.X, centerPoint.Y);
break;
case ThumbArrowDirection.Right:
path.AddLine(rect.Right, centerPoint.Y, rect.Right - offset, rect.Bottom);
path.AddLine(rect.X, rect.Bottom, rect.X, rect.Y);
path.AddLine(rect.Right - offset, rect.Y, rect.Right, centerPoint.Y);
break;
case ThumbArrowDirection.Up:
path.AddLine(centerPoint.X, rect.Y, rect.X, rect.Y + offset);
path.AddLine(rect.X, rect.Bottom, rect.Right, rect.Bottom);
path.AddLine(rect.Right, rect.Y + offset, centerPoint.X, rect.Y);
break;
case ThumbArrowDirection.Down:
path.AddLine(centerPoint.X, rect.Bottom, rect.X, rect.Bottom - offset);
path.AddLine(rect.X, rect.Y, rect.Right, rect.Y);
path.AddLine(rect.Right, rect.Bottom - offset, centerPoint.X, rect.Bottom);
break;
case ThumbArrowDirection.LeftRight:
break;
case ThumbArrowDirection.UpDown:
break;
case ThumbArrowDirection.None:
path.AddRectangle(rect);
break;
}
path.CloseFigure();
return(path);
}
public static GraphicsPath CreateTrackBarThumbPath(
Rectangle rect, ThumbArrowDirection arrowDirection)
{
GraphicsPath path = new GraphicsPath();
PointF centerPoint = new PointF(
rect.X + rect.Width / 2f, rect.Y + rect.Height / 2f);
float offset = 0;
switch (arrowDirection)
{
case ThumbArrowDirection.Left:
case ThumbArrowDirection.Right:
offset = rect.Width / 2f - 4;
break;
case ThumbArrowDirection.Up:
case ThumbArrowDirection.Down:
offset = rect.Height / 2f - 4;
break;
}
switch (arrowDirection)
{
case ThumbArrowDirection.Left:
path.AddLine(
rect.X, centerPoint.Y, rect.X + offset, rect.Y);
path.AddLine(
rect.Right, rect.Y, rect.Right, rect.Bottom);
path.AddLine(
rect.X + offset, rect.Bottom, rect.X, centerPoint.Y);
break;
case ThumbArrowDirection.Right:
path.AddLine(
rect.Right, centerPoint.Y, rect.Right - offset, rect.Bottom);
path.AddLine(
rect.X, rect.Bottom, rect.X, rect.Y);
path.AddLine(
rect.Right - offset, rect.Y, rect.Right, centerPoint.Y);
break;
case ThumbArrowDirection.Up:
path.AddLine(
centerPoint.X, rect.Y, rect.X, rect.Y + offset);
path.AddLine(
rect.X, rect.Bottom, rect.Right, rect.Bottom);
path.AddLine(
rect.Right, rect.Y + offset, centerPoint.X, rect.Y);
break;
case ThumbArrowDirection.Down:
path.AddLine(
centerPoint.X, rect.Bottom, rect.X, rect.Bottom - offset);
path.AddLine(
rect.X, rect.Y, rect.Right, rect.Y);
path.AddLine(
rect.Right, rect.Bottom - offset, centerPoint.X, rect.Bottom);
break;
case ThumbArrowDirection.LeftRight:
break;
case ThumbArrowDirection.UpDown:
break;
case ThumbArrowDirection.None:
path.AddRectangle(rect);
break;
}
path.CloseFigure();
return path;
}
private void DrawDefaultThunm(
Graphics g, Rectangle thumbRect,
Color begin, Color end, Color border, float mode,
Orientation orientation, TickStyle tickStyle)
{
ThumbArrowDirection direction = ThumbArrowDirection.None;
switch (orientation)
{
case Orientation.Horizontal:
switch (tickStyle)
{
case TickStyle.None:
case TickStyle.BottomRight:
direction = ThumbArrowDirection.Down;
break;
case TickStyle.TopLeft:
direction = ThumbArrowDirection.Up;
break;
case TickStyle.Both:
direction = ThumbArrowDirection.None;
break;
}
break;
case Orientation.Vertical:
switch (tickStyle)
{
case TickStyle.TopLeft:
direction = ThumbArrowDirection.Left;
break;
case TickStyle.None:
case TickStyle.BottomRight:
direction = ThumbArrowDirection.Right;
break;
case TickStyle.Both:
direction = ThumbArrowDirection.None;
break;
}
break;
}
using (GraphicsPath path =
GraphicsPathHelper.CreateTrackBarThumbPath(
thumbRect, direction))
{
using (LinearGradientBrush brush = new LinearGradientBrush(
thumbRect, begin, end, mode))
{
Blend blend = new Blend();
blend.Positions = new float[] { 0, .2f, .5f, .8f, 1f };
blend.Factors = new float[] { 1f, .7f, 0, .7f, 1f };
brush.Blend = blend;
g.FillPath(brush, path);
}
using (Pen pen = new Pen(border))
{
g.DrawPath(pen, path);
}
}
thumbRect.Inflate(-1, -1);
using (GraphicsPath path =
GraphicsPathHelper.CreateTrackBarThumbPath(
thumbRect, direction))
{
using (Pen pen = new Pen(InnerBorderColor))
{
g.DrawPath(pen, path);
}
}
}
protected virtual void OnRenderThumb(PaintThumbEventArgs e)
{
Graphics g = e.Graphics;
Rectangle rect = e.ClipRectangle;
ControlState state = e.ControlState;
ThumbArrowDirection direction = ThumbArrowDirection.None;
Color begin = ColorTable.ThumbBackNormal;
Color end = ColorTable.TrackInnerBorder;
Color border = ColorTable.ThumbBorderNormal;
float mode =
base.Orientation == Orientation.Horizontal ?
90f : 0f;
switch (base.Orientation)
{
case Orientation.Horizontal:
switch (base.TickStyle)
{
case TickStyle.None:
case TickStyle.BottomRight:
direction = ThumbArrowDirection.Down;
break;
case TickStyle.TopLeft:
direction = ThumbArrowDirection.Up;
break;
case TickStyle.Both:
direction = ThumbArrowDirection.None;
break;
}
break;
case Orientation.Vertical:
switch (base.TickStyle)
{
case TickStyle.TopLeft:
direction = ThumbArrowDirection.Left;
break;
case TickStyle.None:
case TickStyle.BottomRight:
direction = ThumbArrowDirection.Right;
break;
case TickStyle.Both:
direction = ThumbArrowDirection.None;
break;
}
break;
}
switch (state)
{
case ControlState.Hover:
begin = ColorTable.ThumbBackHover;
border = ColorTable.ThumbBorderHover;
break;
}
using (SmoothingModeGraphics sg = new SmoothingModeGraphics(g))
{
using (GraphicsPath path =
GraphicsPathHelper.CreateTrackBarThumbPath(
rect, direction))
{
using (LinearGradientBrush brush = new LinearGradientBrush(
rect, begin, end, mode))
{
Blend blend = new Blend();
blend.Positions = new float[] { 0, .2f, .5f, .8f, 1f };
blend.Factors = new float[] { 1f, .7f, 0, .7f, 1f };
brush.Blend = blend;
g.FillPath(brush, path);
}
using (Pen pen = new Pen(border))
{
g.DrawPath(pen, path);
}
}
rect.Inflate(-1, -1);
using (GraphicsPath path =
GraphicsPathHelper.CreateTrackBarThumbPath(
rect, direction))
{
using (Pen pen = new Pen(ColorTable.TrackInnerBorder))
{
g.DrawPath(pen, path);
}
}
}
}
