C#绘制柱状图和折线图
VIProgram 人气:2运行效果如下图：
设计上面的柱状图和折线图其实并没有什么难度，主要是各个坐标的计算，完全是精细活。首先在窗体在添加了一个tabControl控件来切换柱状图和折线图的显示，在tabPage1中显示柱状图，在tabPage2中显示折线图。然后在各自的Page页属性中定义Paint事件，具体实现过程可以从下面的代码中看到。
代码如下：
添加头文件：
using System.Drawing.Drawing2D;
tabPage1的Paint事件(画柱状图)：
private void tabPage1_Paint(object sender, PaintEventArgs e)
{
BackColor = Color.White;
//标题
Graphics g = tabPage1.CreateGraphics();
Font f = new Font("宋体", 24, FontStyle.Regular);
Pen p = new Pen(Color.Blue);
g.DrawString("报名及考试统计柱状图", f, p.Brush, 200, 20);
//画表格
for (int i = 0; i <= 9; i++)
{
g.DrawLine(p, 30, 90 + 31 * i, 620, 90 + 31 * i);
}
for (int i = 1; i <= 14; i++)
{
g.DrawLine(p, 30 + 42 * i, 60, 30 + 42 * i, 370);
}
Pen MyPen = new Pen(Color.Blue, 2);
Point p1 = new Point(30, 60);
Point p2 = new Point(30, 370);
Point p3 = new Point(30, 370);
Point p4 = new Point(620, 370);
g.DrawLine(MyPen, p1, p2);
g.DrawLine(MyPen, p3, p4);
//红色图形部分
Pen drawPen = new Pen(Color.Red, 1);
SolidBrush mybrush = new SolidBrush(Color.Red);
e.Graphics.DrawRectangle(drawPen, 30 + 21, 370 - 41, 21, 41);
e.Graphics.FillRectangle(mybrush, 30 + 21, 370 - 41, 21, 41);
e.Graphics.DrawRectangle(drawPen, 30 + 42 * 2 + 21, 370 - 31 * 4 - 10, 21, 31 * 4 + 10);
e.Graphics.FillRectangle(mybrush, 30 + 42 * 2 + 21, 370 - 31 * 4 - 10, 21, 31 * 4 + 10);
e.Graphics.DrawRectangle(drawPen, 30 + 42 * 4 + 21, 370 - 31 * 2 - 20, 21, 31 * 2 + 20);
e.Graphics.FillRectangle(mybrush, 30 + 42 * 4 + 21, 370 - 31 * 2 - 20, 21, 31 * 2 + 20);
e.Graphics.DrawRectangle(drawPen, 30 + 42 * 6 + 21, 370 - 31 * 1 - 20, 21, 31 * 1 + 20);
e.Graphics.FillRectangle(mybrush, 30 + 42 * 6 + 21, 370 - 31 * 1 - 20, 21, 31 * 1 + 20);
e.Graphics.DrawRectangle(drawPen, 30 + 42 * 8 + 21, 370 - 31 * 5 - 25, 21, 31 * 5 + 25);
e.Graphics.FillRectangle(mybrush, 30 + 42 * 8 + 21, 370 - 31 * 5 - 25, 21, 31 * 5 + 25);
e.Graphics.DrawRectangle(drawPen, 30 + 42 * 10 + 21, 370 - 31 * 4 - 7, 21, 31 * 4 + 7);
e.Graphics.FillRectangle(mybrush, 30 + 42 * 10 + 21, 370 - 31 * 4 - 7, 21, 31 * 4 + 7);
e.Graphics.DrawRectangle(drawPen, 30 + 42 * 12 + 21, 60, 21, 370 - 60);
e.Graphics.FillRectangle(mybrush, 30 + 42 * 12 + 21, 60, 21, 370 - 60);
//绿色图形部分
Pen drawPen2 = new Pen(Color.Green, 1);
SolidBrush brush = new SolidBrush(Color.Green);
e.Graphics.DrawRectangle(drawPen2, 30 + 42, 370 - 31, 21, 31);
e.Graphics.FillRectangle(brush, 30 + 42, 370 - 31, 21, 31);
e.Graphics.DrawRectangle(drawPen2, 30 + 42 * 3, 370 - 31 * 2 - 15, 21, 31 * 2 + 15);
e.Graphics.FillRectangle(brush, 30 + 42 * 3, 370 - 31 * 2 - 15, 21, 31 * 2 + 15);
e.Graphics.DrawRectangle(drawPen2, 30 + 42 * 5, 370 - 31 - 10, 21, 41);
e.Graphics.FillRectangle(brush, 30 + 42 * 5, 370 - 31 - 10, 21, 41);
e.Graphics.DrawRectangle(drawPen2, 30 + 42 * 7, 370 - 16, 21, 16);
e.Graphics.FillRectangle(brush, 30 + 42 * 7, 370 - 16, 21, 16);
e.Graphics.DrawRectangle(drawPen2, 30 + 42 * 9, 370 - 31 * 3 - 20, 21, 31 * 3 + 20);
e.Graphics.FillRectangle(brush, 30 + 42 * 9, 370 - 31 * 3 - 20, 21, 31 * 3 + 20);
e.Graphics.DrawRectangle(drawPen2, 30 + 42 * 11, 370 - 31 * 1 - 28, 21, 31 * 1 + 28);
e.Graphics.FillRectangle(brush, 30 + 42 * 11, 370 - 31 * 1 - 28, 21, 31 * 1 + 28);
e.Graphics.DrawRectangle(drawPen2, 30 + 42 * 13, 370 - 31 * 5 - 15, 21, 31 * 5 + 15);
e.Graphics.FillRectangle(brush, 30 + 42 * 13, 370 - 31 * 5 - 15, 21, 31 * 5 + 15);
//图上的文字部分
Font font2 = new Font("宋体", 10, FontStyle.Regular);
g.DrawString("第一期", font2, p.Brush, 30 + 21, 375);
g.DrawString("第二期", font2, p.Brush, 30 + 42 * 2 + 21, 375);
g.DrawString("第三期", font2, p.Brush, 30 + 42 * 4 + 21, 375);
g.DrawString("第四期", font2, p.Brush, 30 + 42 * 6 + 21, 375);
g.DrawString("上半年", font2, p.Brush, 30 + 42 * 8 + 21, 375);
g.DrawString("下半年", font2, p.Brush, 30 + 42 * 10 + 21, 375);
g.DrawString("全年统计", font2, p.Brush, 30 + 42 * 12 + 21, 375);
//图上数字部分
g.DrawString("25", font2, p.Brush, 10, 370 - 35);
g.DrawString("50", font2, p.Brush, 10, 370 - 35 * 2);
g.DrawString("75", font2, p.Brush, 10, 370 - 34 * 3);
g.DrawString("100", font2, p.Brush, 5, 370 - 33 * 4);
g.DrawString("125", font2, p.Brush, 5, 370 - 33 * 5);
g.DrawString("150", font2, p.Brush, 5, 370 - 32 * 6);
g.DrawString("175", font2, p.Brush, 5, 370 - 32 * 7);
g.DrawString("200", font2, p.Brush, 5, 370 - 32 * 8);
g.DrawString("225", font2, p.Brush, 5, 370 - 32 * 9);
g.DrawString("250", font2, p.Brush, 5, 370 - 32 * 10);
//红色数
Pen pen2 = new Pen(Color.Red);
g.DrawString("39", font2, pen2.Brush, 30 + 21, 370 - 41 - 15);
g.DrawString("111", font2, pen2.Brush, 30 + 42 * 2 + 21, 370 - 31 * 4 - 10 - 15);
g.DrawString("71", font2, pen2.Brush, 30 + 42 * 4 + 21, 370 - 31 * 2 - 20 - 15);
g.DrawString("40", font2, pen2.Brush, 30 + 42 * 6 + 21, 370 - 31 * 1 - 20 - 15);
g.DrawString("150", font2, pen2.Brush, 30 + 42 * 8 + 21, 370 - 31 * 5 - 25 - 15);
g.DrawString("111", font2, pen2.Brush, 30 + 42 * 10 + 21, 370 - 31 * 4 - 7 - 15);
g.DrawString("261", font2, pen2.Brush, 30 + 42 * 12 + 21, 60 - 15);
//绿色数
Pen pen3 = new Pen(Color.Green);
g.DrawString("39", font2, pen2.Brush, 30 + 21, 370 - 41 - 15);
g.DrawString("111", font2, pen2.Brush, 30 + 42 * 2 + 21, 370 - 31 * 4 - 10 - 15);
g.DrawString("71", font2, pen2.Brush, 30 + 42 * 4 + 21, 370 - 31 * 2 - 20 - 15);
g.DrawString("40", font2, pen2.Brush, 30 + 42 * 6 + 21, 370 - 31 * 1 - 20 - 15);
g.DrawString("150", font2, pen2.Brush, 30 + 42 * 8 + 21, 370 - 31 * 5 - 25 - 15);
g.DrawString("111", font2, pen2.Brush, 30 + 42 * 10 + 21, 370 - 31 * 4 - 7 - 15);
g.DrawString("261", font2, pen2.Brush, 30 + 42 * 12 + 21, 60 - 15);
//最下面的矩形框
e.Graphics.DrawRectangle(p, 30 + 42 * 2 + 30, 400, 42 * 7, 31 * 2);
e.Graphics.DrawRectangle(drawPen, 30 + 42 * 5, 410, 21, 10);
e.Graphics.FillRectangle(mybrush, 30 + 42 * 5, 410, 21, 10);
g.DrawString("报名人数", font2, pen2.Brush, 30 + 42 * 6, 410);
e.Graphics.DrawRectangle(drawPen2, 30 + 42 * 5, 440, 21, 10);
e.Graphics.FillRectangle(brush, 30 + 42 * 5, 440, 21, 10);
g.DrawString("通过人数", font2, pen3.Brush, 30 + 42 * 6, 440);
}tabPage2的Paint事件(画折线图)：
private void tabPage2_Paint(object sender, PaintEventArgs e)
{
BackColor = Color.White;
//标题
Graphics g = tabPage2.CreateGraphics();
Font f = new Font("宋体", 24, FontStyle.Regular);
Pen p = new Pen(Color.Blue);
g.DrawString("报名及考试统计折线图", f, p.Brush, 200, 20);
//画表格
for (int i = 0; i <= 9; i++)
{
g.DrawLine(p, 30, 90 + 31 * i, 620, 90 + 31 * i);
}
for (int i = 1; i <= 7; i++)
{
g.DrawLine(p, 30 + 84 * i, 60, 30 + 84 * i, 370);
}
Pen MyPen = new Pen(Color.Blue, 2);
Point p1 = new Point(30, 60);
Point p2 = new Point(30, 370);
Point p3 = new Point(30, 370);
Point p4 = new Point(620, 370);
g.DrawLine(MyPen, p1, p2);
g.DrawLine(MyPen, p3, p4);
//绘制折线
Pen pen1 = new Pen(Color.Red, 2);
Pen pen2 = new Pen(Color.Green,2);
//红色折线
Point a1, a2, a3, a4, a5, a6, a7;
a1 = new Point(30,370-31-20);
a2 = new Point(30+84*1,370-(31*4+9));
a3 = new Point(30 + 84 * 2,370-(31*2+28));
a4 = new Point(30 + 84 * 3, 370 - (31 * 1 + 20));
a5 = new Point(30 + 84 * 4, 370 - (31 * 5 + 21));
a6 = new Point(30 + 84 * 5, 370 - (31 * 4 + 10));
a7 = new Point(30 + 84 * 6, 60);
Point[] points = { a1,a2,a3,a4,a5,a6,a7};
g.DrawLines(pen1, points);
//绿色折线
Point b1, b2, b3, b4, b5, b6, b7;
b1 = new Point(30,370-(31*1+1));
b2 = new Point(30+84*1,370-(31*2+15));
b3 = new Point(30 + 84 * 2, 370 - (31 * 1 + 10));
b4 = new Point(30 + 84 * 3, 370 - (31 * 0 + 15));
b5 = new Point(30 + 84 * 4, 370 - (31 * 3 + 15));
b6 = new Point(30 + 84 * 5, 370 - (31 * 1 + 29));
b7 = new Point(30 + 84 * 6, 370 - (31 * 5 + 14));
Point[] points2 = { b1, b2, b3, b4, b5, b6, b7 };
g.DrawLines(pen2,points2);
//图上数字部分
Font font2 = new Font("宋体", 10, FontStyle.Regular);
g.DrawString("25", font2, pen1.Brush, 10, 370 - 35);
g.DrawString("50", font2, pen1.Brush, 10, 370 - 35 * 2);
g.DrawString("75", font2, pen1.Brush, 10, 370 - 34 * 3);
g.DrawString("100", font2, pen1.Brush, 5, 370 - 33 * 4);
g.DrawString("125", font2, pen1.Brush, 5, 370 - 33 * 5);
g.DrawString("150", font2, pen1.Brush, 5, 370 - 32 * 6);
g.DrawString("175", font2, pen1.Brush, 5, 370 - 32 * 7);
g.DrawString("200", font2, pen1.Brush, 5, 370 - 32 * 8);
g.DrawString("225", font2, pen1.Brush, 5, 370 - 32 * 9);
g.DrawString("250", font2, pen1.Brush, 5, 370 - 32 * 10);
//文字
g.DrawString("第一期", font2, pen1.Brush, 15, 375);
g.DrawString("第二期", font2, pen1.Brush, 15 + 84 * 1, 375);
g.DrawString("第三期", font2, pen1.Brush, 15 + 84 * 2, 375);
g.DrawString("第四期", font2, pen1.Brush, 15 + 84 * 3, 375);
g.DrawString("上半年", font2, pen1.Brush, 15 + 84 * 4, 375);
g.DrawString("下半年", font2, pen1.Brush, 15 + 84 * 5, 375);
g.DrawString("全年统计", font2, pen1.Brush, 15 + 84 * 6, 375);
//折线图上的数字
g.DrawString("39", font2, pen1.Brush, 30, 370 - 31 - 20 - 15);
g.DrawString("111", font2, pen1.Brush, 30 + 84 * 1, 370 - (31 * 4 + 9) - 15);
g.DrawString("71", font2, pen1.Brush, 30 + 84 * 2, 370 - (31 * 2 + 28) - 15);
g.DrawString("40", font2, pen1.Brush, 30 + 84 * 3, 370 - (31 * 1 + 20) - 15);
g.DrawString("150", font2, pen1.Brush, 30 + 84 * 4, 370 - (31 * 5 + 21) - 15);
g.DrawString("111", font2, pen1.Brush, 30 + 84 * 5, 370 - (31 * 4 + 10) - 15);
g.DrawString("261", font2, pen1.Brush, 30 + 84 * 6, 60 - 15);
g.DrawString("26", font2, pen2.Brush, 30, 370 - (31 * 1 + 1) - 15);
g.DrawString("68", font2, pen2.Brush, 30 + 84 * 1, 370 - (31 * 2 + 15) - 15);
g.DrawString("35", font2, pen2.Brush, 30 + 84 * 2, 370 - (31 * 1 + 10) - 15);
g.DrawString("14", font2, pen2.Brush, 30 + 84 * 3, 370 - (31 * 0 + 15) - 15);
g.DrawString("94", font2, pen2.Brush, 30 + 84 * 4, 370 - (31 * 3 + 15) - 15);
g.DrawString("49", font2, pen2.Brush, 30 + 84 * 5, 370 - (31 * 1 + 29) - 15);
g.DrawString("143", font2, pen2.Brush, 30 + 84 * 6, 370 - (31 * 5 + 14) - 15);
//最下面的矩形框
SolidBrush mybrush = new SolidBrush(Color.Red);
SolidBrush brush = new SolidBrush(Color.Green);
e.Graphics.DrawRectangle(pen1, 30 + 42 * 2 + 30, 400, 42 * 7, 31 * 2);
e.Graphics.DrawRectangle(pen1, 30 + 42 * 5, 410, 21, 10);
e.Graphics.FillRectangle(mybrush, 30 + 42 * 5, 410, 21, 10);
g.DrawString("报名人数", font2, pen1.Brush, 30 + 42 * 6, 410);
e.Graphics.DrawRectangle(pen2, 30 + 42 * 5, 440, 21, 10);
e.Graphics.FillRectangle(brush, 30 + 42 * 5, 440, 21, 10);
g.DrawString("通过人数", font2, pen2.Brush, 30 + 42 * 6, 440);
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