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   源码介绍

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仿制Windows画图板程序；新建一个Windows窗体应用程序，将窗体Form1调整到适当大小，在窗体Form1中分别添加1个Panel、1个PictureBox和1个StatusStrip控件，在Panel控件中分别放入3个GroupBox控件，3个GroupBox控件中再分别放入9个Button、5个Button和7个Button控件，添加1个ColorDialog控件，在StatusStrip控件中添加1个ToolStripStatusLabe。

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

namespace WinFormsApp1

{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

Graphics g;

Point pStart, pEnd;

int ChoiceGraph;

int penWidth;

enum mySelected

{

Pencil,

Line,

Ellipse,

FillEllipse,

Rec,

FillRec,

Eraser

};

private void Form1_Load(object sender, EventArgs e)

{

g = this.pictureBox1.CreateGraphics();

ChoiceGraph = (int)mySelected.Pencil;

penWidth = 3;

btnControl.BackColor = btnBlack.BackColor;

}

private void btnPencil_Click(object sender, EventArgs e)

{

ChoiceGraph = Convert.ToInt32(((Button)sender).Tag);

}

private void btnEllipse_Click(object sender, EventArgs e)

{

ChoiceGraph = Convert.ToInt32(((Button)sender).Tag);

}

private void btnFillEllipse_Click(object sender, EventArgs e)

{

ChoiceGraph = Convert.ToInt32(((Button)sender).Tag);

}

private void btnRec_Click(object sender, EventArgs e)

{

ChoiceGraph = Convert.ToInt32(((Button)sender).Tag);

}

private void btnFillRec_Click(object sender, EventArgs e)

{

ChoiceGraph = Convert.ToInt32(((Button)sender).Tag);

}

private void btnEraser_Click(object sender, EventArgs e)

{

ChoiceGraph = Convert.ToInt32(((Button)sender).Tag);

}

private void btnLine1_Click(object sender, EventArgs e)

{

btnLine1.BackColor = Color.White;

btnLine2.BackColor = Color.White;

btnLine3.BackColor = Color.White;

btnLine4.BackColor = Color.White;

btnLine5.BackColor = Color.White;

((Button)sender).BackColor = Color.Black;

penWidth = Convert.ToInt32(((Button)sender).Tag);

}

private void btnLine2_Click(object sender, EventArgs e)

{

btnLine1.BackColor = Color.White;

btnLine2.BackColor = Color.White;

btnLine3.BackColor = Color.White;

btnLine4.BackColor = Color.White;

btnLine5.BackColor = Color.White;

((Button)sender).BackColor = Color.Black;

penWidth = Convert.ToInt32(((Button)sender).Tag);

}

private void btnLine3_Click(object sender, EventArgs e)

{

btnLine1.BackColor = Color.White;

btnLine2.BackColor = Color.White;

btnLine3.BackColor = Color.White;

btnLine4.BackColor = Color.White;

btnLine5.BackColor = Color.White;

((Button)sender).BackColor = Color.Black;

penWidth = Convert.ToInt32(((Button)sender).Tag);

}

private void btnLine4_Click(object sender, EventArgs e)

{

btnLine1.BackColor = Color.White;

btnLine2.BackColor = Color.White;

btnLine3.BackColor = Color.White;

btnLine4.BackColor = Color.White;

btnLine5.BackColor = Color.White;

((Button)sender).BackColor = Color.Black;

penWidth = Convert.ToInt32(((Button)sender).Tag);

}

private void btnLine5_Click(object sender, EventArgs e)

{

btnLine1.BackColor = Color.White;

btnLine2.BackColor = Color.White;

btnLine3.BackColor = Color.White;

btnLine4.BackColor = Color.White;

btnLine5.BackColor = Color.White;

((Button)sender).BackColor = Color.Black;

penWidth = Convert.ToInt32(((Button)sender).Tag);

}

private void btnRed_Click(object sender, EventArgs e)

{

if (((Button)sender).Text == "C")

if (colorDialog1.ShowDialog() == DialogResult.OK)

btnControl.BackColor = colorDialog1.Color;

else btnControl.BackColor = ((Button)sender).BackColor;

}

private void btnYellow_Click(object sender, EventArgs e)

{

if (((Button)sender).Text == "C")

if (colorDialog1.ShowDialog() == DialogResult.OK)

btnControl.BackColor = colorDialog1.Color;

else btnControl.BackColor = ((Button)sender).BackColor;

}

private void btnGreen_Click(object sender, EventArgs e)

{

if (((Button)sender).Text == "C")

if (colorDialog1.ShowDialog() == DialogResult.OK)

btnControl.BackColor = colorDialog1.Color;

else btnControl.BackColor = ((Button)sender).BackColor;

}

private void btnBlack_Click(object sender, EventArgs e)

{

if (((Button)sender).Text == "C")

if (colorDialog1.ShowDialog() == DialogResult.OK)

btnControl.BackColor = colorDialog1.Color;

else btnControl.BackColor = ((Button)sender).BackColor;

}

private void btnBlue_Click(object sender, EventArgs e)

{

if (((Button)sender).Text == "C")

if (colorDialog1.ShowDialog() == DialogResult.OK)

btnControl.BackColor = colorDialog1.Color;

else btnControl.BackColor = ((Button)sender).BackColor;

}

private void btnNew_Click(object sender, EventArgs e)

{

pictureBox1.Refresh();

}

private void btnExit_Click(object sender, EventArgs e)

{

this.Close();

}

private void btnControl_Click(object sender, EventArgs e)

{

if (((Button)sender).Text == "C")

if (colorDialog1.ShowDialog() == DialogResult.OK)

btnControl.BackColor = colorDialog1.Color;

else btnControl.BackColor = ((Button)sender).BackColor;

}

private void btnClolorDialog_Click(object sender, EventArgs e)

{

if (((Button)sender).Text == "C")

if (colorDialog1.ShowDialog() == DialogResult.OK)

btnControl.BackColor = colorDialog1.Color;

else btnControl.BackColor = ((Button)sender).BackColor;

}

private void btnLine_Click_1(object sender, EventArgs e)

{

ChoiceGraph = Convert.ToInt32(((Button)sender).Tag);

}

private void pictureBox1_MouseMove(object sender, MouseEventArgs e)

{

toolStripStatusLabel1.Text = "X:"  e.X.ToString() ",Y:"  e.Y.ToString();

if (e.Button == MouseButtons.Left)

switch (ChoiceGraph)

{

case (int)mySelected.Pencil:

Pen pen1 = new Pen(btnControl.BackColor, penWidth);

pEnd.X = e.X;

pEnd.Y = e.Y;

g.DrawLine(pen1, pStart, pEnd);

pStart = pEnd;

break;

case (int)mySelected.Eraser:

Pen pen2 = new Pen(Color.White, penWidth);

pEnd.X = e.X;

pEnd.Y = e.Y;

g.DrawLine(pen2, pStart, pEnd);

pStart = pEnd;

break;

default:

break;

}

}

private void pictureBox1_MouseUp(object sender, MouseEventArgs e)

{

if (e.Button == MouseButtons.Left)

{

pEnd.X = e.X;

pEnd.Y = e.Y;

switch (ChoiceGraph)

{

case (int)mySelected.Line:

Pen pen1 = new Pen(btnControl.BackColor, penWidth);

g.DrawLine(pen1, pStart, pEnd);

break;

case (int)mySelected.Ellipse:

Change_Point();

Pen pen2 = new Pen(btnControl.BackColor, penWidth);

g.DrawEllipse(pen2, pStart.X, pStart.Y, pEnd.X - pStart.X, pEnd.Y - pStart.Y);

break;

case (int)mySelected.FillEllipse:

Change_Point();

SolidBrush myBrush1 = new SolidBrush(btnControl.BackColor);

Rectangle rec1 = new Rectangle(pStart.X, pStart.Y, pEnd.X - pStart.X, pEnd.Y - pStart.Y);

g.FillEllipse(myBrush1, rec1);

break;

case (int)mySelected.Rec:

Change_Point();

Pen pen3 = new Pen(btnControl.BackColor, penWidth);

g.DrawRectangle(pen3, pStart.X, pStart.Y, pEnd.X - pStart.X, pEnd.Y - pStart.Y);

break;

case (int)mySelected.FillRec:

Change_Point();

SolidBrush myBrush2 = new SolidBrush(btnControl.BackColor);

Rectangle rec2 = new Rectangle(pStart.X, pStart.Y, pEnd.X - pStart.X, pEnd.Y - pStart.Y);

g.FillRectangle(myBrush2, rec2);

break;

default:

break;

}

}

}

private void pictureBox1_Click(object sender, EventArgs e)

{ }

private void Change_Point()

{

Point pTemp = new Point();

if (pStart.X < pEnd.X)

if (pStart.Y > pEnd.Y)

{

pTemp.Y = pStart.Y;

pStart.Y = pEnd.Y;

pEnd.Y = pTemp.Y;

}

if (pStart.X > pEnd.X)

{

if (pStart.Y < pEnd.Y)

{

pTemp.X = pStart.X;

pStart.X = pEnd.X;

pEnd.X = pTemp.X;

}

if (pStart.Y > pEnd.Y)

{

pTemp = pStart;

pStart = pEnd;

pEnd = pTemp;

}

}

}

private void pictureBox1_MouseDown(object sender, MouseEventArgs e)

{

if (e.Button == MouseButtons.Left)

{

pStart.X = e.X;

pStart.Y = e.Y;

}

}

}

}