实例介绍
【实例简介】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。
【实例截图】
【核心代码】
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 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;
}
}
}
}
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