C#GDI+自定义绘制曲线图表控件DataChart 简单实现
2021-06-28 04:07
标签：pen 技术分享 rri rgs spn ack latest 添加 bip 这里只说明在计算刻度和曲线绘制的时候 只提供思路，只是做了下简单的计算，不喜勿喷 还望见谅，高手直接飘过吧。这个要做好，还是需要研究研究算法的，比如刻度随着控件的大小发生改变的时候计算不同的值，根据刻度范围来计算刻度以及刻度值等，这里没有研究，制作简单的绘制，让其知道自定义曲线控件的画法，对于新手来讲应该是有一些帮助的。有时间我把研究过后的算法加上做一个通用可靠一点的控件分享。 首先百度一张图片，就按照它的样子来绘制 该图片链接地址 在绘制曲线控件之前首先得 C#GDI+ 绘制线段（实线或虚线）、矩形、字符串、圆、椭圆 这里提供思路，没有仔细去计算， 这里绘制曲线只提供思路，没有仔细研究算法 源代码工程文件下载 C#GDI+自定义绘制曲线图表控件DataChart 简单实现 标签：pen 技术分享 rri rgs spn ack latest 添加 bip 原文地址：https://www.cnblogs.com/JiYF/p/10042536.htmlC#GDI+自定义绘制曲线图表控件DataChart
例子如下图所示
DataChart控件制作
1.添加一个用户控件
2.重写OnPaint方法
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
Graphics graphics = e.Graphics;
//绘制代码部分。。。
}
3.绘制绘图区域
1 #region 绘图区域
2
3 int plotBorder = 0;
4 if (this.plotBorderWith % 2 == 0)
5 plotBorder = this.plotBorderWith / 2;
6 else
7 plotBorder = this.plotBorderWith / 2 + 1;
8
9 int plotWidth = this.Width - this.Padding.Left - this.Padding.Right - this.plotBorderWith;
10 int plotHeitht = this.Height - this.Padding.Top - this.Padding.Bottom - this.plotBorderWith;
11
12
13 Rectangle plotArea = new Rectangle(
14 this.Padding.Left + plotBorder,
15 this.Padding.Top + plotBorder,
16 plotWidth,
17 plotHeitht);
18
19 using (SolidBrush brush = new SolidBrush(this.plotBackColor))
20 {
21 graphics.FillRectangle(brush, plotArea);
22 }
23
24 #endregion
4.绘制曲线区域
1 #region 绘制曲线区域
2
3 int borderwith = 0;
4 if (this.gridBorderWith % 2 == 0)
5 borderwith = this.gridBorderWith / 2;
6 else
7 borderwith = this.gridBorderWith / 2;
8
9 int gridWith = this.Width - this.Padding.Left - this.Padding.Right - this.FontHeight - this.FontHeight - this.gridBorderWith - 2 * this.plotBorderWith;
10 int gridHeight = this.Height - this.FontHeight - 2 * this.FontHeight - this.gridBorderWith;
11
12 Rectangle rectangle = new Rectangle(
13 this.Padding.Left + this.FontHeight + this.FontHeight + this.plotBorderWith + this.gridBorderWith / 2,
14 this.Padding.Top + this.FontHeight,
15 gridWith,
16 gridHeight);
17
18 using (SolidBrush solidGridBrush = new SolidBrush(this.gridBackColor))
19 {
20 graphics.FillRectangle(solidGridBrush, rectangle);
21 }
22 using (Pen penGrid = new Pen(this.gridBorderColor, this.gridBorderWith))
23 {
24 graphics.DrawRectangle(penGrid, rectangle);
25 }
26 #endregion
5.绘制文本区域
1 #region 绘制文本区域
2
3 SizeF szfTitle;
4 SizeF szfyLabel;
5 SizeF szfxLabel;
6
7 szfTitle = graphics.MeasureString(this.title, this.Font);
8 szfyLabel = graphics.MeasureString(this.yLabel, this.Font);
9 szfxLabel = graphics.MeasureString(this.xLabel, this.Font);
10
11 //绘制标题
12 if (this.title != null)
13 {
14 int strLeft = rectangle.X + rectangle.Width / 2 - (int)szfTitle.Width / 2;
15 int strHeight = this.Padding.Top + this.plotBorderWith;
16
17 graphics.DrawString(this.title, this.Font, Brushes.Black, strLeft, strHeight);
18 }
19 //绘制垂直方向文本
20 if (this.yLabel != null)
21 {
22 graphics.TranslateTransform(0, this.Height); //坐标平移
23 graphics.RotateTransform(-90); //坐标旋转
24
25 int strLeft = 0;
26 if (this.xLabel != "")
27 strLeft = this.Padding.Bottom + this.gridBorderWith + 2 * (int)szfxLabel.Height + rectangle.Height / 2 - (int)szfyLabel.Width / 2;
28 else
29 strLeft = this.Padding.Bottom + this.gridBorderWith + (int)szfxLabel.Height + rectangle.Height / 2 - (int)szfyLabel.Width / 2;
30
31 int strHeight = 0;
32
33 graphics.DrawString(this.yLabel, this.Font, Brushes.Black, strLeft, strHeight);
34
35 graphics.RotateTransform(90);
36 graphics.TranslateTransform(0, -this.Height);
37
38 }
39 //绘制水平方向文本
40 if (this.xLabel != null)
41 {
42 int strLeft = rectangle.X + rectangle.Width / 2 - (int)szfxLabel.Width / 2;
43 int strHeight = rectangle.Y + rectangle.Height + (int)szfxLabel.Height;
44
45 graphics.DrawString(this.xLabel, this.Font, Brushes.Black, strLeft, strHeight);
46 }
47 #endregion
6.绘制坐标轴
1 #region x轴
2
3 double scale = (this.xMax - this.xMin) / rectangle.Width;
4
5 int number = 10; //将x轴分为10份实际根据控件的大小来做分配，这里简单举例10份为例
6 double perPixel = rectangle.Width / number; //每一份的占用的像素宽度
7 double value = 100; //间隔值 这里只是写测试例子直接写死了，按照使用来讲不能这么干有时间了，这是个算法问题，重新补上
8
9 int position = 0;
10 double positionValue = this.xMin;
11 using (Pen pen = new Pen(this.gridLineColor, 1))
12 {
13 for (int i = 0; i )
14 {
15 pen.DashStyle = DashStyle.Solid;
16
17 //x轴刻度
18
19 graphics.DrawLine(pen,
20 rectangle.X + position,
21 rectangle.Y + rectangle.Height,
22 rectangle.X + position,
23 rectangle.Y + rectangle.Height - 8);
24
25
26 string scaleValue = positionValue.ToString("F0");
27 SizeF szfValue = graphics.MeasureString(scaleValue, this.Font);
28
29 int strX = rectangle.X + position - (int)szfValue.Width / 2;
30 int strY = rectangle.Y + rectangle.Height;
31
32 //x轴刻度值
33 graphics.DrawString(scaleValue, this.Font, Brushes.Black, strX, strY);
34
35 positionValue += value;
36 position += (int)perPixel;
37 }
38
39 }
40
41 #endregion
42
43 #region y轴
44 double scaley = (this.yMax - this.yMin) / this.Width;
45
46 int numbery = 6;
47 double perPixelY = rectangle.Height / numbery;
48 double valueYinterval = 10;
49
50 int positiony = 0;
51 double positionValueY = this.yMin;
52 using (Pen pen = new Pen(this.gridLineColor, 1))
53 {
54 for (int i = 0; i )
55 {
56
57 pen.DashStyle = DashStyle.Solid;
58
59 //y轴刻度
60
61 graphics.DrawLine(pen,
62 rectangle.X,
63 rectangle.Y + rectangle.Height - positiony,
64 rectangle.X + 8,
65 rectangle.Y + rectangle.Height - positiony);
66
67
68 string scaleValueY = positionValueY.ToString("F0");
69 SizeF szfValue = graphics.MeasureString(scaleValueY, this.Font);
70
71 int strX = rectangle.X - (int)szfValue.Width;
72 int strY = rectangle.Y + rectangle.Height - positiony - (int)szfValue.Height/2;
73
74 //x轴刻度值
75 graphics.DrawString(scaleValueY, this.Font, Brushes.Black, strX, strY);
76 positionValueY += valueYinterval;
77 positiony += (int)perPixelY;
78 }
79
80 }
81 #endregion
7.绘制曲线
1 #region 绘制曲线
2
3 if (x == null || y == null) return;
4
5 float scaleX = (float)(rectangle.Width / (this.xMax - this.xMin));
6 float scaleY = (float)(rectangle.Height / (this.yMax - this.yMin));
7
8 PointF[] points = new PointF[x.Length];
9
10 for (int i = 0; i this.x.Length; i++)
11 {
12 points[i] = new PointF(
13 (float)((this.x[i] - this.xMin) * scaleX + rectangle.X),
14 rectangle.Y + rectangle.Height - (float)((this.y[i] - this.yMin) * scaleY));
15 }
16
17 using (Pen pen = new Pen(this.curveColor))
18 {
19 graphics.DrawLines(pen, points);
20 }
21
22 #endregion
8.效果展示
9.程序源代码下载
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