C#绘制趋势图表代码示例

//获取数据
DataSet   ds=getData1(param1,param2,param3,param4);//自己替换掉
//建立图形对象
Graphics   objGraphics;//建立画板对象
Bitmap   objBitmap=new   Bitmap(1000,500);//建立位图对象
objGraphics=Graphics.FromImage(objBitmap);//根据位图对象建立画板对象
objGraphics.Clear(Color.White);//设置画板对象背景色
//绘制坐标轴
PointF   point1=new   PointF(30,420);//定义坐标轴原点
PointF   point2=new   PointF(970,420);//定义横坐标终点
PointF   point3=new   PointF(30,30);//定义纵坐标终点
PointF   point4=new   PointF(25,40);//定义箭头左侧点
PointF   point5=new   PointF(35,40);//定义箭头右侧点
PointF   line1Start=new   PointF(30,320);//定义水平线100单位起点
PointF   line1End=new   PointF(970,320);//定义水平线100单位终点
PointF   line2Start=new   PointF(30,220);//定义水平线200单位起点
PointF   line2End=new   PointF(970,220);//定义水平线200单位终点
PointF   line3Start=new   PointF(30,120);//定义水平线300单位起点
PointF   line3End=new   PointF(970,120);//定义水平线300单位终点
objGraphics.DrawLine(Pens.Black,point1,point2);//绘制横坐标
objGraphics.DrawLine(Pens.Black,point1,point3);//绘制纵坐标
objGraphics.DrawLine(Pens.Black,point3,point4);//绘制左侧箭头线
objGraphics.DrawLine(Pens.Black,point3,point5);//绘制右侧箭头线
objGraphics.DrawLine(Pens.YellowGreen,line1Start,line1End);//绘制水平线100单位
objGraphics.DrawLine(Pens.YellowGreen,line2Start,line2End);//绘制水平线200单位
objGraphics.DrawLine(Pens.YellowGreen,line3Start,line3End);//绘制水平线300单位
//获取数据
float[]   arrValues=new   float[ds.Tables[0].Rows.Count];
float   flag=0;//获取最大的数值
for(int   i=0;i <ds.Tables[0].Rows.Count;i++)