类图
1) 具有渐变色的Label控件MyLabel：具有渐变色的标签
2) 实现坐标系控件 MyCoordinate
代码
1) MyLabel
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Drawing;
using System.ComponentModel;
using System.Drawing.Drawing2D;
namespace WindowsFormsControlLibrary
{
/// <summary>
/// 自定义Label
/// </summary>
/// <remarks>
/// 渐变背景的Label
/// </remarks>
public class MyLabel:Control
{
/// <summary>
/// 背景渐变颜色2
/// </summary>
private Color backColor2;
/// <summary>
/// 背景渐变颜色2
/// </summary>
public Color BackColor2
{
get
{
return backColor2;
}
set
{
//重绘控件
this.Invalidate();
backColor2 = value;
}
}
public override string Text
{
get
{
return base.Text;
}
set
{
//重绘控件
this.Invalidate();
base.Text = value;
}
}
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
LinearGradientBrush currentBrush = new LinearGradientBrush
(
new Point(0, 0),
new Point(0, Height),
BackColor, backColor2
);
e.Graphics.FillRectangle(currentBrush, ClientRectangle);
//测量字体所占的矩形大小
SizeF textSize = e.Graphics.MeasureString(Text, Font);
Brush foreBrush = new SolidBrush(ForeColor);
e.Graphics.DrawString(Text, Font, foreBrush,
new PointF(
(Width - textSize.Width) / 2,
(Height - textSize.Height) / 2
)
);
currentBrush.Dispose();
foreBrush.Dispose();
}
private void InitializeComponent()
{
this.SuspendLayout();
this.ResumeLayout(false);
}
}
}
2) MyCoordinate
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Drawing;
using System.ComponentModel;
using System.Drawing.Drawing2D;
namespace WindowsFormsControlLibrary
{
public class MyCoordinate:Control
{
//坐标轴X与控件边缘的距离
private const int xPad = 80;
//坐标轴Y与控件边缘的距离
private const int yPad = 60;
/// <summary>
/// X坐标标签间距
/// </summary>
private int coordinateLablePadX = 20;
public int CoordinateLablePadX
{
get
{
return coordinateLablePadX;
}
set
{
Invalidate();
coordinateLablePadX = value;
}
}
/// <summary>
/// Y坐标标签间距
/// </summary>
private int coordinateLablePadY = 30;
public int CoordinateLablePadY
{
get
{
return coordinateLablePadY;
}
set
{
Invalidate();
coordinateLablePadY = value;
}
}
/// <summary>
/// y坐标轴起点坐标
/// </summary>
public Point YCoordinateStartPoint
{
get
{
return new Point(xPad, this.Height - yPad);
}
}
/// <summary>
/// y坐标轴终点坐标
/// </summary>
public Point YCoordinateEndPoint
{
get
{
return new Point(xPad, yPad);
}
}
/// <summary>
/// x坐标轴起点坐标
/// </summary>
public Point XCoordinateStartPoint
{
get
{
return YCoordinateStartPoint;
}
}
/// <summary>
/// x坐标轴终点坐标
/// </summary>
public Point XCoordinateEndPoint
{
get
{
Point current = new Point();
current.X = Width-xPad ;
current.Y = Height - yPad ;
return current;
}
}
/// <summary>
/// 当前鼠标的位置坐标
/// </summary>
private Point currentMouseLocation = new Point();
private void InitializeComponent()
{
this.SuspendLayout();
//
// MyCoordinate
//
this.ResumeLayout(false);
}
/// <summary>
/// 重载绘制事件
/// </summary>
/// <param name="e"></param>
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
Pen currentPen=new Pen(Color.Black ) ;
currentPen.EndCap = LineCap.ArrowAnchor ;
//绘制Y轴
e.Graphics.DrawLine(
currentPen,
YCoordinateStartPoint,
YCoordinateEndPoint
);
//绘制Y轴
e.Graphics.DrawLine(
currentPen,
XCoordinateStartPoint,
XCoordinateEndPoint
);
currentPen.Dispose();
//绘制X,Y 标签
DrawCoordinateLabel(e.Graphics, YCoordinateStartPoint, YCoordinateEndPoint,XCoordinateStartPoint, XCoordinateEndPoint);
}
/// <summary>
/// 重载鼠标移动事件
/// </summary>
/// <param name="e"></param>
protected override void OnMouseMove(MouseEventArgs e)
{
base.OnMouseMove(e);
currentMouseLocation = e.Location;
this.Invalidate();
}
/// <summary>
/// 绘制坐标标记
/// </summary>
private void DrawCoordinateLabel(Graphics gp,Point startYPoint,Point endYPoint,Point startXPoint,Point endXPoint)
{
//int y = YCoordinateStartPoint .Y - YCoordinateEndPoint.Y;
int currentValue=-1;
float labelX = 0,labelY=0;
int pad = 5;
//绘制Y轴
for (int current = YCoordinateStartPoint.Y; current >YCoordinateEndPoint.Y ; current -= CoordinateLablePadY)
{
currentValue++;
SizeF textSize= gp.MeasureString(currentValue.ToString(), Font);
labelX=YCoordinateStartPoint.X - xPad / 2;
labelY=current-textSize.Height/2;
//绘制label
gp.DrawString(currentValue.ToString () ,Font,Brushes.Black,
new PointF(labelX ,labelY)
);
//绘制|-
gp.DrawLine(Pens.Black,new Point(YCoordinateStartPoint.X,current),new Point(YCoordinateStartPoint.X+pad,current ));
}
currentValue = -1;
//绘制X轴
for (int current = XCoordinateStartPoint.X ; current < XCoordinateEndPoint.X ; current += CoordinateLablePadX)
{
currentValue++;
SizeF textSize = gp.MeasureString(currentValue.ToString(), Font);
labelY = XCoordinateStartPoint.Y + yPad / 2;
labelX = current;
//绘制label
gp.DrawString(currentValue.ToString(), Font, Brushes.Black,
new PointF(labelX, labelY)
);
//绘制_|_
gp.DrawLine(Pens.Black,
new Point(current, XCoordinateStartPoint.Y ),
new Point(current, XCoordinateStartPoint.Y-pad )
);
}
//绘制交叉线
List<Point> list = GetCurrentArrowLinesPoints(currentMouseLocation);
gp.DrawLine(Pens.Blue , list[0], list[1]);
gp.DrawLine(Pens.Blue, list[2], list[3]);
//绘制交叉点的坐标
DrawMousePointLabel(gp, currentMouseLocation);
}
/// <summary>
/// 绘制当前鼠标所指的坐标位置
/// </summary>
/// <param name="ph"></param>
/// <param name="current"></param>
private void DrawMousePointLabel(Graphics ph,Point current)
{
int margin = 15;
current = LimitMouseLocation(current);
string text = string.Format("X:{0} Y:{1}",
(current.X -xPad)/ CoordinateLablePadX,
((YCoordinateStartPoint.Y-YCoordinateEndPoint.Y)/CoordinateLablePadY)-(current.Y-yPad)/CoordinateLablePadY
);
ph.DrawString(text, Font, Brushes.Black , new PointF((float)current.X+margin , (float)current.Y));
}
/// <summary>
/// 当前鼠标经过位置点的交叉线坐标
/// </summary>
/// <param name="p"></param>
/// <returns></returns>
private List<Point> GetCurrentArrowLinesPoints(Point p)
{
List<Point> list = new List<Point>();
p = LimitMouseLocation(p);
Point px1 = new Point(p.X, YCoordinateStartPoint.Y);
list.Add(px1);
Point px2 = new Point(p.X, YCoordinateEndPoint.Y);
list.Add(px2);
Point py1 = new Point(XCoordinateStartPoint.X ,p.Y );
list.Add(py1);
Point py2 = new Point(XCoordinateEndPoint.X, p.Y );
list.Add(py2);
return list;
}
/// <summary>
/// 修正鼠标位置
/// </summary>
/// <param name="p"></param>
/// <returns></returns>
private Point LimitMouseLocation(Point p)
{
//X越界后修正
if (p.X > XCoordinateEndPoint.X)
{
p.X = XCoordinateEndPoint.X;
}
else if (p.X < XCoordinateStartPoint.X)
{
p.X = XCoordinateStartPoint.X;
}
//Y越界后修正
if (p.Y < YCoordinateEndPoint.Y)
{
p.Y = YCoordinateEndPoint.Y;
}
else if (p.Y > YCoordinateStartPoint.Y)
{
p.Y = YCoordinateStartPoint.Y;
}
return p;
}
}
}
运行效果
