渐变五角星

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Drawing2D;
using System.Drawing.Printing;

namespace testgrid
...{
    public partial class Form1 : Form
    ...{
        public Form1()
        ...{
            InitializeComponent();
        }

        private void dataGridView1_CellEnter(object sender, DataGridViewCellEventArgs e)
        ...{
            
           
        }

        private void Form1_Load(object sender, EventArgs e)
        ...{

        }

        private void dataGridView1_KeyDown(object sender, KeyEventArgs e)
        ...{
            MessageBox.Show(e.ToString());
            e.Handled = true;
        }
        protected override void OnPaint(PaintEventArgs e)
        ...{
            //Graphics g = e.Graphics;
            //Pen pen = new Pen(ForeColor);
            //g.SmoothingMode = SmoothingMode.None;
            //g.PixelOffsetMode = PixelOffsetMode.Default;
            //g.DrawLine(pen, 2, 2, 180, 100);
            DoPage(e.Graphics, ForeColor, ClientSize.Width, ClientSize.Height);
        }
        protected override void OnClick(EventArgs e)
        ...{
            PrintDocument prndoc = new PrintDocument();
            prndoc.DocumentName = Text;
            prndoc.PrintPage += new PrintPageEventHandler(prndoc_PrintPage);
        }

        void prndoc_PrintPage(object sender, PrintPageEventArgs e)
        ...{
            Graphics g = e.Graphics;
            SizeF sizef = g.VisibleClipBounds.Size;
            DoPage(g, Color.Black, (int)sizef.Width, (int)sizef.Height);
        }
        protected virtual void DoPage(Graphics g, Color clr, int cx, int cy)
        ...{
            Pen pen=new Pen(clr);
            g.DrawLine(pen,0,0,cx-1,cy-1);
            g.DrawLine(pen, cx - 1, 0, 0, cy - 1);
        }

        public void Form1_SizeChanged(object sender, EventArgs e)
        ...{
            this.Refresh();
        }
    }
}

 

 

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Drawing2D;

namespace testgrid
...{
    public partial class StarGradientBrush : Form1
    ...{
        public StarGradientBrush()
        ...{
            InitializeComponent();
        }
        protected override void DoPage(Graphics g, Color clr, int cx, int cy)
        ...{
            //base.DoPage(g, clr, cx, cy);
            Point[] apt = new Point[5];
            for (int i = 0; i < apt.Length; i++)
            ...{
                double dAngle = (i * 0.8 - 0.5) * Math.PI;
                apt[i] = new Point((int)(cx * (0.5 + 0.48 * Math.Cos(dAngle))),(int)(cy*(0.5+0.48*Math.Sin(dAngle))));

            }
            PathGradientBrush pgbrush = new PathGradientBrush(apt);
            pgbrush.CenterColor = Color.White;
            pgbrush.SurroundColors = new Color[1] ...{ Color.Black };
            g.FillRectangle(pgbrush, 0, 0, cx, cy);
        }
    }
}