计算机图形学直线生成算法

计算机图形学直线生成算法
包含DDA算法,中点Bresenham算法,改进的Bresenham算法的完整c语言程序代码,

我连画圆的一块给你吧
需要橡皮筋 椭圆 树什么的可以和我说 我是用 c#写的
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace line
{
public partial class Form1 : Form
{
Graphics g;

public Form1()
{
InitializeComponent();
g = pictureBox1.CreateGraphics();

}
private void button1_Click_1(object sender, EventArgs e)
{
// g.TranslateTransform(-300,-300);
g.Clear(BackColor);
double x1, x2, y1, y2;
double x, y;
x1 = System.Convert.ToSingle(textBox1.Text);
y1 = System.Convert.ToSingle(textBox2.Text);
x2 = System.Convert.ToSingle(textBox3.Text);
y2 = System.Convert.ToSingle(textBox4.Text);
x = x1;
double k = (y1 - y2) / (x1 - x2);
Color color1 = Color.FromArgb(255, 0, 0); //定义颜色
Brush bru1 = new SolidBrush(color1);//定义笔
Color color2 = Color.FromArgb(0, 255, 0); //定义颜色
Brush bru2 = new SolidBrush(color2);//定义笔
Pen pen1 = new Pen(bru1, 1);
Pen pen2 = new Pen(bru2, 1);
while (x < x2)
{
// textBox3.Text = System.Convert.ToString(k);
y = (double)k * (x - x1) + y1;
double a;
a=y%1;
float xx = Convert.ToSingle(x);
float yy = Convert.ToSingle(y);
if (a > 0.5)
{

g.DrawLine(pen1, xx, yy, xx,yy+1);
}
else
{
g.DrawLine(pen2, xx, yy, xx, yy+1);
}
x++;

}
//g.DrawLine(p,10,10,100,100);

}
private void button2_Click(object sender, EventArgs e)
{
g.TranslateTransform(300, 300);
g.Clear(BackColor);
float r;//r为圆的圆心
r =System.Convert.ToSingle(textBox6.Text);
Color color1 = Color.FromArgb(255, 0, 0); //定义颜色
Brush bru1 = new SolidBrush(color1);//定义笔
Color color2 = Color.FromArgb(0, 255, 0); //定义颜色
Brush bru2 = new SolidBrush(color2);//定义笔
Pen pen1 = new Pen(bru1,1);
Pen pen2 = new Pen(bru2, 1);
float x = 0;
float y = r;
while (x 0.5)
{
g.DrawLine(pen1, x, y, x, y+1);
g.DrawLine(pen1, -x, y, -x, y + 1);
g.DrawLine(pen1, x, -y, x, -y + 1);
g.DrawLine(pen1, -x, -y, -x, -y + 1);
}
else
{
g.DrawLine(pen2, x, y, x, y+1);
g.DrawLine(pen2, -x, y, -x, y + 1);
g.DrawLine(pen2, x,- y, x,- y + 1);
g.DrawLine(pen2, -x, -y,- x, -y + 1);
}
x++;
}
g.TranslateTransform(-300, -300);
}
private void button3_Click(object sender, EventArgs e)
{

}
private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
switch (comboBox1.Text)
{
case "画圆":
{

textBox1.Visible = false;
textBox2.Visible = false;
textBox3.Visible = false;
textBox4.Visible = false;
textBox5.Visible = true;
textBox6.Visible = true;
textBox7.Visible = false;
textBox8.Visible = false;
label1.Visible = false;
label2.Visible = false;
label3.Visible = false;
label4.Visible = false;
label5.Visible = true;
label6.Visible = true;
label7.Visible = false;
label8.Visible = false;
label9.Visible = true;
button1.Visible = false;
button2.Visible = true;
button3.Visible = false;
break;
}
case"画线":
{
textBox1.Visible = true;
textBox2.Visible = true;
textBox3.Visible = true;
textBox4.Visible = true;
textBox5.Visible = false;
textBox6.Visible = false;
textBox7.Visible = false;
textBox8.Visible = false;
label1.Visible = true;
label2.Visible = true;
label3.Visible = true;
label4.Visible = true;
label5.Visible = false;
label6.Visible = false;
label7.Visible = false;
label8.Visible = false;
label9.Visible = false;
button1.Visible = true;
button2.Visible = false;
button3.Visible = false;
break;
}
case"画椭圆":
{
textBox1.Visible = false;
textBox2.Visible = false;
textBox3.Visible = false;
textBox4.Visible = false;
textBox5.Visible = false;
textBox6.Visible = false;
textBox7.Visible = true;
textBox8.Visible = true;
label1.Visible = false;
label2.Visible = false;
label3.Visible = false;
label4.Visible = false;
label5.Visible = false;
label6.Visible = false;
label7.Visible = true;
label8.Visible = true;
label9.Visible = false;
button1.Visible = false;
button2.Visible = false;
button3.Visible = true;
break;
}
}
}

}
}