C# winform绘制条形统计图的例子

条形统计图，的高度，颜色的填充，实质上是把各个数据按照一定的数据处理方式，做成合适的矩形宽与高，在用颜色填充即可。

本次从C#入门到精通的摘取一个例子。代码略作适当的调整。

        public void createImage() {

            int Tp1 = 13;

            int Tp2 = 1;

            int Tp3 = 2;

            int Tp4 = 1;

            double tp1 = 13.0/ 27*100;

            double tp2 = 1.0 / 27*100;

            double tp3 = 2.0 / 27*100;

            double tp4 = 1.0 / 27*100;

            int width = 300, height = 300;//声明宽与高

            Bitmap bitmap = new Bitmap(width, height);//创建一个绘图对象

            Graphics g = Graphics.FromImage(bitmap);

            try

            {

                g.Clear(Color.White);

                //创建6个brush，用于填充颜色

                Brush brush1 = new SolidBrush(Color.White);

                Brush brush2 = new SolidBrush(Color.Black);

                Brush brush3 = new SolidBrush(Color.Red);

                Brush brush4 = new SolidBrush(Color.Green);

                Brush brush5 = new SolidBrush(Color.Orange);

                Brush brush6 = new SolidBrush(Color.DarkBlue);

                //创建两个Font对象，用于设置字体

                Font font1 = new Font("Courier New", 16, FontStyle.Bold);

                Font font2 = new Font("Courier New", 8);

                g.FillRectangle(brush1, 0, 0, width, height);//绘制背景图

                g.DrawString("投票结果", font1, brush2, new Point(90, 20));//绘制标题

                Point p1 = new Point(70, 50);

                Point p2 = new Point(230, 50);

                g.DrawLine(new Pen(Color.Black), p1, p2);//绘制一条直线

                g.DrawString("用一生去下载你",font2,brush2,new Point(10,80));

                g.DrawString("一生所爱", font2, brush2, new Point(32, 110));

                g.DrawString("云也相逢", font2, brush2, new Point(32, 140));

                g.DrawString("情茧", font2, brush2, new Point(54, 170));

                g.FillRectangle(brush3, 100, 80, (int)tp1, 17);//100,代表是横向，80代表是纵向，(int)tp1代表是矩形长，17代表是宽

                g.FillRectangle(brush4, 100, 110, (int)tp2, 17);

                g.FillRectangle(brush5, 100, 140, (int)tp3, 17);

                g.FillRectangle(brush6, 100, 170, (int)tp4, 17);

              

                g.DrawString("用一生去下载：13票", font2, brush2, new Point(25, 220));

                g.DrawString("一生所爱：1票", font2, brush2, new Point(155, 220));

                g.DrawString("云也相逢：1票", font2, brush2, new Point(25, 250));

                g.DrawString("情茧：1票", font2, brush2, new Point(155, 250));

                g.DrawRectangle(new Pen(Color.Green), 10, 210, 280, 80);

                pictureBox1.Image = bitmap;

            }

            catch (Exception)

            {

               

                throw;

            }

       

        }