关于java迪卡儿曲线代码的信息

java画双曲线

public class Test3 {

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public static void main(String[] args) {

TriFunc tri = new TriFunc();

// 生成一块25×100的画布

Canvas canvas = new Canvas(25, 100);

// 画sin曲线，周期为2

tri.drawSin(canvas, 2.0);

canvas.printCanvas();

System.out.println();

canvas.reset();

// 画cos曲线，周期为2

tri.drawCos(canvas, 2.0);

canvas.printCanvas();

}

}

class TriFunc {

/**

* 画sin曲线

* @param canvas 画布

* @param period 曲线周期

*/

public void drawSin(Canvas canvas, double period) {

char[][] chars = canvas.getCanvas();

// x 轴的比率

double xRatio = (2 * period * Math.PI) / (canvas.getWidth() - 1);

// y 轴的放大倍率

int yMulti = (canvas.getHeight() - 1) / 2;

for(int i = 0; i canvas.getWidth(); i++) {

// 将数组索引映射为横坐标值

double k = (i - canvas.getWidth() / 2) * xRatio;

// 将sin值映射为数组索引

int h = yMulti - (int)Math.round(Math.sin(k) * yMulti);

chars[h][i] = Canvas.FILL_CHAR;

}

}

/**

* 画cos曲线

* @param canvas 画布

* @param period 曲线周期

*/

public void drawCos(Canvas canvas, double period) {

char[][] chars = canvas.getCanvas();

double xRatio = (2 * period * Math.PI) / (canvas.getWidth() - 1);

int yMulti = (canvas.getHeight() - 1) / 2;

for(int i = 0; i canvas.getWidth(); i++) {

double k = (i - canvas.getWidth() / 2) * xRatio;

int h = yMulti - (int)Math.round(Math.cos(k) * yMulti);

chars[h][i] = Canvas.FILL_CHAR;

}

}

}

class Canvas {

private int height;

private int width;

private char[][] canvas;

// 填充字符

public static char FILL_CHAR = '#';

// 空白字符

public static char BLANK_CHAR = ' ';

/**

* 构建一块画布

* @param height

* @param width

*/

public Canvas(int height, int width) {

// 由于需要画坐标轴，所以得采用奇数

this.height = height % 2 == 0 ? height + 1 : height;

this.width = width % 2 == 0 ? width + 1 : width;

init();

}

/**

* 初始化画布

*/

private void init() {

this.canvas = new char[height][width];

for(int i = 0; i height; i++) {

for(int j = 0; j width; j++) {

canvas[i][j] = BLANK_CHAR;

}

}

addAxis();

}

/**

* 添加坐标轴

*/

private void addAxis() {

// 添加横坐标

int y = height / 2;

for(int x = 0; x width; x++) {

canvas[y][x] = '-';

}

// 添加纵坐标

int xx = width / 2;

for(int yy = 0; yy height; yy++) {

canvas[yy][xx] = '|';

}

// 添加原点

canvas[y][xx] = '+';

}

/**

* 输出画布

*/

public void printCanvas() {

for(int i = 0; i height; i++) {

for(int j = 0; j width; j++) {

System.out.print(canvas[i][j]);

}

System.out.println();

}

}

/**

* 清空画布

*/

public void reset() {

init();

}

public int getHeight() {

return height;

}

public int getWidth() {

return width;

}

public char[][] getCanvas() {

return canvas;

}

}

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已知曲线的公式，如何用JAVA编程将曲线显示出来，要JAVA源代码

代码如下，只是时间仓促有些简陋，没有坐标轴，而且大小比例问题也没有调好。不过功能实现了。嘎嘎，新手上路，腾云驾雾。

import java.awt.Graphics;

import javax.swing.JFrame;

import javax.swing.JPanel;

public class Bbso extends JPanel{

int x,y,x1,y1,m=100;

double d;

public Bbso() {

JFrame f = new JFrame();

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

f.setBounds(100,100,500,300);

f.setTitle("画曲线");

f.setVisible(true);

f.getContentPane().add(this);

}

public static void main(String arg[]) {

new Bbso();

}

public void paint(Graphics g) {

super.paintComponent(g);

x1=0;

y1=0;

for(x=-250;x250;x++) {

d=-0.2045*x*x+100.41*x-6736.8; //这里填写公式

y=(int)d;

g.drawLine(x1,y1+m,x,y+m);

x1=x;

y1=y;

}

}

}

java list怎么笛卡尔积

ListString list1=new ArrayListString();

ListString list2=new ArrayListString();

ListString list3=new ArrayListString();   //用来接收笛卡尔积

list1.add("str1");

list1.add("str2");

list1.add("str3");

list2.add("aaa");

list2.add("bbb");

for(String value1 : list1)

{

for(String value2 : list2)

{

String temp=value1+","+value2;

list3.add(temp);

}

}