///?<summary>
///?繪制折線圖
///?</summary>
///?<param?name="sender"></param>
///?<param?name="e"></param>

private?void?Form2_Paint(object?sender,?PaintEventArgs?e)
{
//首先確定原點
Point?centerPoint=new?Point(180,340);
//自定義一個帶有箭頭的畫筆
Pen?pen?=?new?Pen(Color.Black,1);
pen.EndCap?=?System.Drawing.Drawing2D.LineCap.ArrowAnchor;
//得到當前窗體的Graphics對象
Graphics?g?=?e.Graphics;
//畫X軸和Y軸
//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));
//繪制X軸的點
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));
//繪制Y軸的點
for?(int?i?=?0;?i?<?12;?i++)
{
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));
}

//計算十二個月銷售額對應的坐標點
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;
}
//繪制十二個點的折線
for?(int?i?=?0;?i?<?data.Length?;?i++)
{
g.DrawRectangle(Pens.Black,?dataPoint[i].X,?dataPoint[i].Y,?2,?2);
}

//將十二個點串成線
g.DrawLines(Pens.Black,?dataPoint);

//方法二：Path方法
//GraphicsPath?path?=?new?GraphicsPath();//要導入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("銷售額：單位（萬元）",?this.Font,?Brushes.Black,?new?Point(14,?14));
g.DrawString("某工廠某產品年度銷售額圖表",this.Font,?Brushes.Black,?new?Point(420,14));
pen.Dispose();
}

轉載于:https://blog.51cto.com/dingxiaowei/1366814

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