其实是这样的，比如在第一象限，有两个点，他们距离圆心的距离肯定是一样的，这样呢，从第一个点（比如x0,y0）附近的一个点开始(可以让它为（x0-1，yo）)，如果这个点到原点的距离比半径大，说明当前点在圆外，那么下一个点：x坐标-1，y不变。如果这个点到原点的距离比半径小，说明在圆内，那么下一个点：x左边不变，y+1.如此下去。每一步都比较当前点和终点的x，y坐标值，有一个相等的话就可以结束了。。
也就是说每次只需要画一个点。或者谁给我一个完整的画一个点的代码也可以。。因为完全没用过c#,所以，请给个完整代码，能直接运行的，别只给画点的方法。
我想这对学过c#的大虾们是很简单的。请提供第一象限画弧的完整代码，谢谢
今晚12点前就要交，可以追加分。
也就是说每次只需要画一个点。或者谁给我一个完整的画一个点的代码也可以。。因为完全没用过c#,所以，请给个完整代码，能直接运行的，别只给画点的方法。
我想这对学过c#的大虾们是很简单的。请提供第一象限画弧的完整代码，谢谢
今晚12点前就要交，可以追加分。
这主要是数学问题，写一个输入x坐标输出y坐标的函数之后Grahpic里一个个点画上去就是了
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import javax.swing.JFrame;public class DrawArc extends JFrame{
int xs = 80;
int ys = 200;
int xe = 200;
int ye = 80;
int step = 1;
int xm = xs;
int ym = ys;
public DrawArc(String title) {
this.setBounds(300, 300, 300, 300);
this.setVisible(true);
this.setResizable(false);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setTitle(title);
} /**
* @param args
*/
public static void main(String[] args) {
new DrawArc("Draw Arc");
} public void paint(Graphics g) {
g.drawString("习题17：生成圆弧的逐点比较算法", 40, 100);
try {
Thread.currentThread().sleep(2000);
} catch (InterruptedException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
int width =0;
while(width<300){
width++;
try {
Thread.currentThread().sleep(2);
} catch (InterruptedException e) {
e.printStackTrace();
}
g.clearRect(0, 0, width, width);
}
g.drawLine(40, 40, 40, 40);
for (int i = 0; i < 3; i++) {
g.clearRect(41, 41, 50, 60);
try {
Thread.currentThread().sleep(300);
} catch (InterruptedException e) {
e.printStackTrace();
}
g.setColor(Color.RED);
g.drawString("O", 50, 60);// 坐标原点
try {
Thread.currentThread().sleep(300);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
g.setColor(Color.PINK);
int xx = 40;
int yy = 40;
while (xx <= 280) {
g.drawLine(30, 40, xx, 40);// x
xx++;
try {
Thread.currentThread().sleep(3);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
g.drawLine(280, 40, 275, 35);
g.drawLine(280, 40, 275, 45);
g.drawString("x", 270, 60); while (yy <= 280) {
g.drawLine(40, 30, 40, yy);// y
yy++;
try {
Thread.currentThread().sleep(3);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
g.drawLine(40, 280, 35, 275);
g.drawLine(40, 280, 45, 275);
g.drawString("y", 50, 275);
g.setColor(Color.BLACK);
g.drawLine(80, 200, 80, 200);// start
g.drawLine(200, 80, 200, 80);// end
g.setColor(Color.RED);
g.drawString("A(80,200)", 80, 215);// A
try {
Thread.currentThread().sleep(5);
} catch (InterruptedException e) {
e.printStackTrace();
}
g.setColor(Color.BLACK);
for (int i = 0; i < 2; i++) {
g.clearRect(215, 60, 160, 140);
try {
Thread.currentThread().sleep(300);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
g.setColor(Color.RED);
g.drawString("B(200,80)", 215, 80);// B,end point
try {
Thread.currentThread().sleep(300);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
for (int i = 0; i < 2; i++) {
g.clearRect(80, 202, 60, 40);
try {
Thread.currentThread().sleep(300);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
g.setColor(Color.RED);
g.drawString("A(80,200)", 80, 215);// A,start point
try {
Thread.currentThread().sleep(300);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
g.setColor(Color.BLACK);
int r = 60 * 60 + 180 * 180;
while (xm != xe && ym != ye) {
try {
Thread.currentThread().sleep(10);
} catch (InterruptedException e) {
e.printStackTrace();
}
if (((xm - 20) * (xm - 20) + (ym - 20) * (ym - 20)) < r) {
xm = xm + step;
}
if ((xm - 20) * (xm - 20) + (ym - 20) * (ym - 20) >= r) {
ym = ym - step;
}
g.drawLine(xm, ym, xm, ym);
}
xs = 80;
ys = 200;
xe = 200;
ye = 80;
xm = xs;
ym = ys;
width = 0;
while(width<300){
width++;
try {
Thread.currentThread().sleep(2);
} catch (InterruptedException e) {
e.printStackTrace();
}
g.clearRect(0, 0, width, width);
}
g.setColor(Color.RED);
g.setFont(new Font("宋体",Font.BOLD, 40));
g.drawString("Thank you!", 40, 170);
g.setFont(new Font("宋体",Font.BOLD, 12));
g.drawString("watch again?", 40, 230);
g.drawString("min the window then max it!", 70, 240);
g.setColor(Color.BLACK);
g.drawString("习题17：生成圆弧的逐点比较算法", 40, 50);
g.drawString("组员1 0658039", 40, 70);
g.drawString("组员2 0658047", 40, 90);
g.drawString("组员3 0658045", 40, 110);
g.drawString("组员4 0658035", 40, 130);
}}
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Windows.Forms;namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
DrawArc();
} private void DrawArc()
{
double r = Math.Sqrt(x0 * x0 + y0 * y0); int x = x0;
int y = y0;
Bitmap bmp = new Bitmap(pictureBox1.Width, pictureBox1.Height);
{
// 画点，这里使用的是点在pictureBox中的坐标
bmp.SetPixel(x, pictureBox1.Height - y, Color.Black);
x--;
while (x != x1 && y != y1)
{
bmp.SetPixel(x, pictureBox1.Height - y, Color.Black);
double r1 = Math.Sqrt(x * x + y * y);
if (r1 <= r)
y++;
else
x--;
}
bmp.SetPixel(x, pictureBox1.Height - y, Color.Black);
pictureBox1.BackgroundImage = bmp;
}
} // 表示坐标系的值，从（100，10）画到（10，100）的弧
int x0 = 100;
int y0 = 10; int x1 = 10;
int y1 = 100;
}
}
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
namespace _1001
{
/// <summary>
/// Form1 的摘要说明。
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.Container components = null;
Pen myPen = new Pen(Color.Red);
// int xs = 80;
// int ys = 200;
int xe = 200;
int ye = 80;
int step = 1;
int xm = 80;
int ym = 200;
public Form1()
{
//
// Windows 窗体设计器支持所必需的
//
InitializeComponent();
//
// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
//
}
/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
#region Windows Form Designer generated code
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.components = new System.ComponentModel.Container();
this.Size = new System.Drawing.Size(300,300);
this.Text = "Form1";
}
#endregion
/// <summary>
/// 应用程序的主入口点。
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new Form1());
}
protected override void OnPaint(PaintEventArgs e)
{
Graphics g = e.Graphics;
myPen.Width = 1;
g.DrawLine(myPen,40, 40, 40, 40);
g.DrawLine(myPen,30, 40, 280, 40);// x
g.DrawLine(myPen,280, 40, 275, 35);
g.DrawLine(myPen,280, 40, 275, 45);
g.DrawLine(myPen,40, 30, 40, 280);// y
g.DrawLine(myPen,40, 280, 35, 275);
g.DrawLine(myPen,40, 280, 45, 275);
g.DrawLine(myPen,80, 200, 80, 201);// start
g.DrawLine(myPen,200, 80, 200, 81);// end
int r = 60 * 60 + 180 * 180;
while (xm != xe && ym != ye)
{
if (((xm - 20) * (xm - 20) + (ym - 20) * (ym - 20)) < r) {
xm = xm + step;
}
if ((xm - 20) * (xm - 20) + (ym - 20) * (ym - 20) >= r) {
ym = ym - step;
}
g.DrawLine(myPen,xm, ym, xm, ym-1);
}
}
}
} 这是我在网上找到画直线的方法，把OnPaint（）方法改了一下，实现了，好像与楼上的是用不同的方式。
希望后来的人能批评或借鉴
* 说明：写一个画类似汽车码表的函数，无返回值。
* 参数：int Deg
* 要求：
* 在一个400*400的黑色画布中间画一个半径为100的圆，圆的上半部分被均分成0-180等分。传入一个角度值（画出指针指向的位置）
********************************************************************************/
protected void DrawWatchCircle()
{
int r = 150;//大圆半径
int r2 = 140;//小圆半径
int r3 = 130;//整刻度线
int x1=0;
int x2 = 0;
int y1 = 0;
int y2=0; Graphics g = panel2.CreateGraphics();
g.DrawArc(new Pen(Color.White, 2), 50, 50, 300, 300, 45, 360);//画大圆
//画刻度
for (int i = 0; i <= 180; i++)
{
if (i <= 90)
{
if (i % 2 == 0)
{
x1 = 200 - (int)(r * Math.Cos(i * Math.PI / 180));
y1 = 200 - (int)(r * Math.Sin(i * Math.PI / 180));
x2 = 200 - (int)(r2 * Math.Cos(i * Math.PI / 180));
y2 = 200 - (int)(r2 * Math.Sin(i * Math.PI / 180));
}
if (i % 10 == 0)
{
x2 = 200 - (int)(r3 * Math.Cos(i * Math.PI / 180));
y2 = 200 - (int)(r3 * Math.Sin(i * Math.PI / 180));
g.DrawString(Convert.ToString(i / 2), new Font("宋体", 10), Brushes.White, new Point(x2,y2));
}
}
else
{
if (i % 2 == 0)
{
x1 = 200 + (int)(r * Math.Cos((180 - i) * Math.PI / 180));
y1 = 200 - (int)(r * Math.Sin((180 - i) * Math.PI / 180));
x2 = 200 + (int)(r2 * Math.Cos((180 - i) * Math.PI / 180));
y2 = 200 - (int)(r2 * Math.Sin((180 - i) * Math.PI / 180));
}
if (i % 10 == 0)
{
x2 = 200 + (int)(r3 * Math.Cos((180 - i) * Math.PI / 180));
y2 = 200 - (int)(r3 * Math.Sin((180 - i) * Math.PI / 180));
// x2 -= 5;
//y2 -= 5;
g.DrawString(Convert.ToString(i / 2), new Font("宋体", 10), Brushes.White, new Point(x2-5, y2));
}
}
Point p1 = new Point(x1, y1);
Point p2 = new Point(x2, y2); //g.DrawString(Convert.ToString(i / 2), new Font("宋体", 5), Brushes.White, p2);
g.DrawLine(new Pen(Color.White), p2, p1);//画刻度线
}
} protected void DrawHand(int _Data)
{
_Data *= 2;
if (_Data > 180)
_Data = 180;
int r2 = 140;
int Handx = 0;
int Handy = 0;
Point CenterPoint=new Point(200,200);
if (_Data > 90)
{
Handx = 200 - (int)(r2 * Math.Cos(_Data * Math.PI / 180));
Handy = 200 - (int)(r2 * Math.Sin(_Data * Math.PI / 180));
}
else
{
Handx = 200 + (int)(r2 * Math.Cos((180 - _Data) * Math.PI / 180));
Handy = 200 - (int)(r2 * Math.Sin((180 - _Data) * Math.PI / 180));
} panel2.Refresh();
Graphics g = panel2.CreateGraphics();
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
// g.Clear(Color.Black);
Point HandPoint = new Point(Handx,Handy);
g.DrawLine(new Pen(Brushes.Blue), CenterPoint, HandPoint);
g.Dispose();
}
protected void DrawHand()
{
int _Data = int.Parse(textBoxSpeed.Text.ToString());
_Data *= 2;
if (_Data > 180)
_Data = 180;
int r2 = 140;
int Handx = 0;
int Handy = 0;
Point CenterPoint = new Point(200, 200);
if (_Data > 90)
{
Handx = 200 - (int)(r2 * Math.Cos(_Data * Math.PI / 180));
Handy = 200 - (int)(r2 * Math.Sin(_Data * Math.PI / 180));
}
else
{
Handx = 200 + (int)(r2 * Math.Cos((180 - _Data) * Math.PI / 180));
Handy = 200 - (int)(r2 * Math.Sin((180 - _Data) * Math.PI / 180));
} //panel2.Refresh();
Graphics g = panel2.CreateGraphics();
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; // g.Clear(Color.Black);
Point HandPoint = new Point(Handx, Handy); g.DrawLine(new Pen(Brushes.Blue), CenterPoint, HandPoint);
g.Dispose();
}