Windows应用程序（C#）画板画图
使用VS开发Windows画板应用程序，来实现画图的功能，使用C#语言开发。效果如图。
工具/原料
已安装VS2010或其它版本的VS编辑器软件的电脑一台
程序目录
新建两个Form，一个叫Form1为程序主窗体用来绘图，一个select_font，Resources文件夹下存放图标图片。图片123.bmp存放在bin/Debug下面，颜色为青绿色，它是写出的文字颜色纹理。
窗体设计
Form1窗体，画图窗体界面。
select_font窗体，用来调用计算机字体，会在画图面板写字时调用出来。
调用select_font窗体，效果如图。
select_font窗体代码
引用：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
全局变量：
public int fontsize;
public string fontname;
Load中代码:
private void select_font_Load(object sender, EventArgs e)
{ Graphics g = this.CreateGraphics(); for (int i = 0; i <= System.Drawing.FontFamily.GetFamilies(g).Length - 1; i++) { this.comboBox1.Items.Add(System.Drawing.FontFamily.GetFamilies(g)[i].Name.ToString()); for (int j = 7; j <= 72; j += 2) { this.comboBox2.Items.Add(j.ToString()); } this.comboBox1.SelectedItem = "隶书"; this.comboBox2.SelectedItem= "11"; } }
下拉列表代码：
private void comboBox1_SelectedIndexChanged(object sender, EventArgs e) { fontname = this.comboBox1.SelectedItem.ToString(); }
private void comboBox2_SelectedIndexChanged(object sender, EventArgs e) { fontsize = Convert.ToInt16(this.comboBox2.SelectedItem.ToString()); }
Form1主窗体代码
引用：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Drawing2D;
调用select_font和全局变量：
public Bitmap pbmap;
Graphics g;
Pen p;
Color color;
string drawlx;
int zx, x, y, xx, yy, xxx, yyy;
float x1, x2, y1, y2;
select_font sfont = new select_font();
Load中代码：
private void Form1_Load(object sender, EventArgs e) { this.toolStripStatusLabel2.Text = System.DateTime.Now.ToString(); }
所有鼠标点击代码;
private void label2_Click(object sender, EventArgs e) { color = this.label2.BackColor; }
private void 新建ToolStripMenuItem_Click(object sender, EventArgs e) { g = this.pictureBox1.CreateGraphics(); pbmap = new Bitmap(pictureBox1.Width, pictureBox1.Height); }
private void label7_Click(object sender, EventArgs e) { color = this.label7.BackColor; }
private void label8_Click(object sender, EventArgs e) { color = this.label8.BackColor; }
private void lineShape2_Click(object sender, EventArgs e) { zx = 3; }
private void lineShape3_Click(object sender, EventArgs e) { zx = 5; }
private void button8_Click(object sender, EventArgs e) { drawlx = "line"; }
private void 清空ToolStripMenuItem_Click(object sender, EventArgs e) { //g = this.pictureBox1.CreateGraphics(); //Bitmap image = new Bitmap("123.bmp"); //TextureBrush brush = new TextureBrush(image); this.pictureBox1.Image = null; }
private void button15_Click(object sender, EventArgs e) { drawlx = "ellipse"; /* this.panel3.Controls.Clear(); this.label10.Visible = true; this.label10.Left = 0; this.label10.Top = 20; this.panel3.Controls.Add(this.label10);*/ }
private void lineShape1_Click(object sender, EventArgs e) { zx = 1; }
private void button13_Click(object sender, EventArgs e) { drawlx = "polygon"; }
private void label9_Click(object sender, EventArgs e) { color = this.label9.BackColor; }
private void label5_Click(object sender, EventArgs e) { color = this.label5.BackColor; }
private void label4_Click(object sender, EventArgs e) { color = this.label4.BackColor; }
private void label6_Click(object sender, EventArgs e) { color = this.label6.BackColor; }
private void label3_Click(object sender, EventArgs e) { color = this.label3.BackColor; }
private void button16_Click(object sender, EventArgs e) { drawlx = "rectangle"; }
private void button14_Click(object sender, EventArgs e) { drawlx = "circle"; }
private void button9_Click(object sender, EventArgs e) { this.textBox1.Visible = true; sfont.Show(); }
private void button19_Click(object sender, EventArgs e) { Bitmap image = new Bitmap("123.bmp"); TextureBrush brush = new TextureBrush(image);//TextureBrush 纹理刷 Font font = new Font(sfont.fontname, sfont.fontsize); g.DrawString(this.textBox1.Text, font, brush, new Point(100, 100)); sfont.Hide(); }
private void 保存ToolStripMenuItem_Click(object sender, EventArgs e) { saveFileDialog1.InitialDirectory = "c:"; saveFileDialog1.Filter = "JPEG图片|*.jpg|Png图像(*.png)|*.png|所有格式(*.*)|*.*"; if (saveFileDialog1.ShowDialog() == DialogResult.OK) { string folderP = saveFileDialog1.FileName; //Image img = pbmap; this.pictureBox1.Image.Save(folderP); //img.Save(folderP); } }
private void button7_Click(object sender, EventArgs e) { drawlx = "Curve"; }
private void pictureBox1_MouseMove(object sender, MouseEventArgs e) { xx = e.X; yy = e.Y; }
private void 关闭ToolStripMenuItem1_Click(object sender, EventArgs e) { this.Close(); }
鼠标MouseDown和MouseUp事件代码：
private void pictureBox1_MouseDown(object sender, MouseEventArgs e) { x1 = e.X; y1 = e.Y; x = e.X; y = e.Y; }
private void pictureBox1_MouseUp(object sender, MouseEventArgs e) { xxx = e.X; yyy = e.Y; x2 = e.X; y2 = e.Y; Graphics g = Graphics.FromImage(pbmap); if (drawlx == "line") { p = new Pen(color, zx); g.DrawLine(p, x1, y1, x2, y2); } if (drawlx == "ellipse") { p = new Pen(color, zx); g.DrawEllipse(p, x1, y1, x2, y2); } if (drawlx == "polygon") { p = new Pen(color, zx); g.DrawPolygon(p, new Point[]{ new Point(x,y), new Point(x+10,y+25), new Point(x+35,y+25), new Point(x+10,y+35), new Point(x+20,y+55), new Point(x,y+40), new Point(x-20,y+55), new Point(x-10,y+35), new Point(x-35,y+25), new Point(x-10,y+25), new Point(x,y)}); } if (drawlx == "rectangle") { p = new Pen(color, zx); g.DrawRectangle(p, new Rectangle(x, y, x, y)); } if (drawlx == "circle") { Point centerPoint = new Point(x, y); int r = 60; GraphicsPath path = new GraphicsPath(); path.AddEllipse(centerPoint.X - r, centerPoint.Y - r, 2 * r, 2 * r); PathGradientBrush brush = new PathGradientBrush(path); brush.CenterPoint = centerPoint; brush.CenterColor = Color.White; brush.SurroundColors = new Color[] { color }; g.FillEllipse(brush, centerPoint.X - r, centerPoint.Y - r, 2 * r, 2 * r); } if (drawlx == "Curve") { // Graphics g ; Pen p = new Pen(color, zx); g.DrawCurve(p, new Point[]{ new Point(x,y), new Point(x+100,y-120), new Point(x+200,y+100), new Point(x+250,y-200), new Point(xxx,yyy)}, 0.8f); } this.pictureBox1.Image = pbmap; }
控件类型（补充）
select_font窗体：
comboBox1、comboBox2、radioButton1、radioButton2、radioButton3
Form1主绘图窗体：
菜单：ToolStripMenuItem
绘图工具、确认字体按钮：都是button按钮
线条粗细：lineShape
颜色面板：label
文字输入框：textBox
注意事项
各个版本VS可能有所区别，但方法基本一致。
注意全局变量和控件的使用。