C#如何用Graphics画出一幅图表

/// <summary>

/// 绘制折线图

/// </summary>

/// <param name="sender"></param>

/// <param name="e"></param>

private void Form2_Paint(object sender, PaintEventArgs e)

{

//首先确定原点

Point centerPoint=new Point(180,340);

//自定义一个带有箭头的画笔

Pen pen = new Pen(Color.Black,1);

pen.EndCap = System.Drawing.Drawing2D.LineCap.ArrowAnchor;

//得到当前窗体的Graphics对象

Graphics g = e.Graphics;

//画X轴和Y轴

//g.DrawLine(pens.Black,centerPoint,new Point(centerPoint.X+600,centerPoint.Y));

//g.DrawLine(Pens.Black, centerPoint, new Point(centerPoint.X, 40));

g.DrawLine(pen, centerPoint, new Point(centerPoint.X + 650, centerPoint.Y));

g.DrawLine(pen, centerPoint, new Point(centerPoint.X, 20));

//绘制X轴的点

for (int i = 0; i < 12; i++)

g.DrawLine(Pens.Black, new Point(centerPoint.X + (i + 1) * 50, centerPoint.Y), new Point(centerPoint.X + (i + 1) * 50, centerPoint.Y-5));

g.DrawString((i + 1).ToString() + "月", this.Font, Brushes.Black, new PointF((centerPoint.X + (i + 1) * 50) - 7, centerPoint.Y + 3));

}

g.DrawString("X:月份",this.Font,Brushes.Black,new Point(828,355));

//绘制Y轴的点

g.DrawLine(Pens.Black, new Point(centerPoint.X, centerPoint.Y - (i + 1) * 25), new Point(centerPoint.X + 5, centerPoint.Y-(i + 1) * 25));

//g.DrawLine(Pens.Black, new Point(centerPoint.X , centerPoint.Y), new Point(centerPoint.X + (i + 1) * 50, centerPoint.Y - 5));

g.DrawString(string.Format("{0}",(i+1)*10), this.Font, Brushes.Black, new PointF((centerPoint.X + 5) - 35, (centerPoint.Y - (i + 1) * 25)-5));

//计算十二个月销售额对应的坐标点

double[] data = { 56.2, 66.3, 98.4, 34.5, 55.6, 87.3, 81.4, 33.3, 46.4, 34.6, 114.5, 80.4};

PointF[] dataPoint = new PointF[data.Length];

for (int i = 0; i < data.Length ; i++)

float y = (float)(340 - data[i] * 2.5);

float x = centerPoint.X + (i + 1) * 50;

PointF point = new PointF(x, y);

dataPoint[i] = point;

//绘制十二个点的折线

g.DrawRectangle(Pens.Black, dataPoint[i].X, dataPoint[i].Y, 2, 2);

//将十二个点串成线

g.DrawLines(Pens.Black, dataPoint);

//方法二：Path方法

//GraphicsPath path = new GraphicsPath();//要导入using System.Drawing.Drawing2D;

//for (int i = 0; i < data.Length; i++)

//{

// path.AddRectangle(new RectangleF(dataPoint[i], new SizeF(2, 2)));

//}

//path.AddLines(dataPoint);

//g.DrawPath(Pens.Black, path);

g.DrawString("Y", this.Font, Brushes.Black, new Point(155,7));

g.DrawString("销售额：单位（万元）", this.Font, Brushes.Black, new Point(14, 14));

g.DrawString("某工厂某产品年度销售额图表",this.Font, Brushes.Black, new Point(420,14));

pen.Dispose();