C#可视化编程——画板 画图

using System;

using System.Collections.Generic;

using https://www.360docs.net/doc/0118706899.html,ponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

namespace drawing

{

public partial class Form1 : Form

{

public int i = 0;//定义循环变量

public int f=0;//定义填充色判断符

public int n=3;//定义多边形边数

public int t;

Brush nbrush = new SolidBrush(Color.Black);//定义填充色笔刷

public void clear()//点组清零

{

for(int k=0;k<100;k++)

{

p[k].X=0;p[k].Y=0;

pp[k].X=0;pp[k].Y=0;

}

i = 0;

}

public Form1()

{InitializeComponent();

}

public Point[] p = new Point[100];//画直线、矩形、椭圆的取点

public Point[] pp = new Point[100];//画多边形的取点

public int flag = 0;//画直线、矩形、椭圆、多边形的判断符

Pen npen = new Pen(Color.Black, 1);//

private void Form1_MouseDown(object sender, MouseEventArgs e)

{

p[0].X = e.X;//直线、矩形、椭圆的起点

p[0].Y = e.Y;

pp[i].X = e.X;//给多边形取点

pp[i].Y = e.Y;

i++;

if (flag == 4)

{

Graphics gobj = this.CreateGraphics();

if (i > 1)

{

gobj.DrawLine(npen,pp[i - 2].X, pp[i - 2].Y, pp[i-1].X, pp[i-1].Y);

}

if (i == n)

{

gobj.DrawLine(npen, pp[i - 1].X, pp[i - 1].Y, pp[0].X, pp[0].Y);

if (f == 1)

{

Point[] pp1 = new Point[n];//新建一点组

for (t = 0; t < n; t++)

pp1[t] = pp[t];

gobj.FillPolygon(nbrush, pp1);

}

clear();

}

}

}

private void Form1_MouseUp(object sender, MouseEventArgs e)

{

if (flag != 4)

{

p[1].X = e.X;

p[1].Y = e.Y;

if (flag == 1)

{

Graphics gobj = this.CreateGraphics();

gobj.DrawLine(npen, p[0].X, p[0].Y, p[1].X, p[1].Y);

}

else if (flag == 2)

{

Graphics gobj = this.CreateGraphics();

gobj.DrawRectangle(npen, p[0].X, p[0].Y, p[1].X - p[0].X, p[1].Y - p[0].Y);

if (f == 1)

gobj.FillRectangle(nbrush, p[0].X, p[0].Y, p[1].X - p[0].X, p[1].Y - p[0].Y);

}

else if (flag == 3)

{

Graphics gobj = this.CreateGraphics();

gobj.DrawEllipse(npen, p[0].X, p[0].Y, p[1].X - p[0].X, p[1].Y - p[0].Y);

if(f==1)

gobj.FillEllipse(nbrush, p[0].X, p[0].Y, p[1].X - p[0].X, p[1].Y - p[0].Y);

}

}

}

private void toolStripButton1_Click(object sender, EventArgs e)

{flag = 1; }

private void toolStripButton2_Click(object sender, EventArgs e)

{flag = 2;}

private void toolStripButton3_Click(object sender, EventArgs e)

{flag = 3;}

private void toolStripButton4_Click(object sender, EventArgs e)

{flag = 4;}

private void Form1_Load(object sender, EventArgs e)

{}

private void toolStripComboBox1_SelectedIndexChanged(object sender, EventArgs e)

{

n = Convert.ToInt32(toolStripComboBox1.Text);

}

private void toolStripComboBox2_Click(object sender, EventArgs e)

{}

private void toolStripComboBox2_SelectedIndexChanged(object sender, EventArgs e)

{

npen.Width = Convert.ToInt32(toolStripComboBox2.Text);

}

private void toolStripComboBox3_SelectedIndexChanged(object sender, EventArgs e)

{

switch (toolStripComboBox3.Text)

{

case"Custom": npen.DashStyle = System.Drawing.Drawing2D.DashStyle.Custom;break;

case"Dash": npen.DashStyle = System.Drawing.Drawing2D.DashStyle.Dash;break;

case"DashDot": npen.DashStyle = System.Drawing.Drawing2D.DashStyle.DashDot;break;

case"DashDotDot": npen.DashStyle = System.Drawing.Drawing2D.DashStyle.DashDotDot;break;

case"Dot": npen.DashStyle = System.Drawing.Drawing2D.DashStyle.Dot;break;

case"Solid": npen.DashStyle = System.Drawing.Drawing2D.DashStyle.Solid;break;

}

}

private void toolStripComboBox5_Click(object sender, EventArgs e)

{}

private void toolStripComboBox5_SelectedIndexChanged(object sender, EventArgs e) {

f = 1;

switch (toolStripComboBox5.Text)

{

case"Black": nbrush = new SolidBrush(Color.Black); break;

case"Red": nbrush = new SolidBrush(Color.Red); break;

case"Blue": nbrush = new SolidBrush(Color.Blue); break;

case"Yellow": nbrush = new SolidBrush(Color.Yellow); break;

case"Green": nbrush = new SolidBrush(Color.Green); break;

case"Brown": nbrush = new SolidBrush(Color.Brown); break;

case"Pink": nbrush = new SolidBrush(Color.Pink); break;

case"White": nbrush = new SolidBrush(Color.White); break;

}

}

private void toolStripComboBox4_SelectedIndexChanged(object sender, EventArgs e) {

switch (toolStripComboBox4.Text)

{

case"Black":npen.Color = Color.Black;break;

case"Red":npen.Color = Color.Red;break;

case"Blue":npen.Color = Color.Blue;break;

case"Yellow":npen.Color = Color.Yellow;break;

case"Green":npen.Color = Color.Green;break;

case"Brown":npen.Color = Color.Brown;break;

case"Pink":npen.Color = Color.Pink;break;

case"White":npen.Color = Color.White;break;

}

}

private void button1_Click(object sender, EventArgs e)

{

Graphics gobj = this.CreateGraphics();

}

private void button1_MouseClick(object sender, MouseEventArgs e)

{

clear();

}

}

}