仿制Windows画图板程序
控件
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。
代码
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 画图板程序
{
public partial class Form1 : Form
{
Graphics g;
Point pStart, pEnd; // 定义画图的起始终点
int ChoiceGraph; // 所选择图形枚举
int penWidth; // 画笔宽度
enum mySelected
{
Pencil, // 铅笔
Line, // 直线
Ellipse, // 空心椭圆
FillEllipse, // 填充椭圆
Rec, // 空心矩形
FillRec, // 填充矩形
Eraser // 橡皮擦
};
public Form1()
{
InitializeComponent();
}
private void btnNew_Click(object sender, EventArgs e)
{
pictureBox1.Refresh(); // 刷新
}
private void btnExit_Click(object sender, EventArgs e)
{
this.Close(); // 关闭
}
private void btnLine1_Click(object sender, EventArgs e)
{
//把所有按钮的背景色都设为 White
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; // 选中的按钮背景色为黑色
penWidth = Convert.ToInt32(((Button)sender).Tag); // 将宽度按钮的 Tag 值设为画笔宽度
}
private void btnLine2_Click(object sender, EventArgs e)
{
//把所有按钮的背景色都设为 White
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; // 选中的按钮背景色为黑色
penWidth = Convert.ToInt32(((Button)sender).Tag); // 将宽度按钮的 Tag 值设为画笔宽度
}
private void btnLine3_Click(object sender, EventArgs e)
{
//把所有按钮的背景色都设为 White
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; // 选中的按钮背景色为黑色
penWidth = Convert.ToInt32(((Button)sender).Tag); // 将宽度按钮的 Tag 值设为画笔宽度
}
private void btnLine4_Click(object sender, EventArgs e)
{
//把所有按钮的背景色都设为 White
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; // 选中的按钮背景色为黑色
penWidth = Convert.ToInt32(((Button)sender).Tag); // 将宽度按钮的 Tag 值设为画笔宽度
}
private void btnLine5_Click(object sender, EventArgs e)
{
//把所有按钮的背景色都设为 White
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; // 选中的按钮背景色为黑色
penWidth = Convert.ToInt32(((Button)sender).Tag); // 将宽度按钮的 Tag 值设为画笔宽度
}
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 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 btnColorDialog_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 pictureBox1_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left) // 如果单击鼠标左键，则将当前点坐标赋给起始点
{
pStart.X = e.X;
pStart.Y = e.Y;
}
}
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: // 选择的是铅笔
Pen pen1 = new Pen(btnControl.BackColor, penWidth);
pEnd.X = e.X;
pEnd.Y = e.Y;
g.DrawLine(pen1, pStart, pEnd);
pStart = pEnd; // 将已经绘制的终点作为下一次绘制的起点
break;
case (int)mySelected.Eraser:
Pen pen2 = new Pen(Color.White, penWidth); // 定义白色画笔作为擦除效果
pEnd.X = e.X;
pEnd.Y = e.Y;
g.DrawLine(pen2, pStart, pEnd);
pStart = pEnd; // 将已经绘制的终点作为下一次绘制的起点
break;
default:
break;
}
}
}
private void Change_Point()
{
Point pTemp = new Point(); // 定义临时点
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_MouseUp(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left) // 如果用户按下的是鼠标左键，记录终点坐标
{
pEnd.X = e.X;
pEnd.Y = e.Y;
switch (ChoiceGraph)
{
case (int)mySelected.Line: // 如果选择的是直线
Pen pen1 = new Pen(btnControl.BackColor, penWidth);
g.DrawLine(pen1, pStart, pEnd);
break;
case (int)mySelected.Ellipse: // 如果选择的是空心椭圆
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: // 如果选择的是实心椭圆
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: // 如果选择的是矩形
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: // 如果选择的是实心矩形
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 btnPencil_Click(object sender, EventArgs e)
{
ChoiceGraph = Convert.ToInt32(((Button)sender).Tag);
}
private void btnLine_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 Form1_Load(object sender, EventArgs e)
{
g = this.pictureBox1.CreateGraphics();
ChoiceGraph = (int)mySelected.Pencil; // 默认选择为铅笔工具
penWidth = 3; // 初始化画笔宽度
btnControl.BackColor = btnBlack.BackColor; // 默认黑色笔
}
}
}
效果图
