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java画正弦函数代码 用java编写正三角
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用java语言绘制正弦曲线
很简单，程序写给你，给分：
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import java.awt.*;
import javax.swing.JFrame;
import java.util.Random;
import java.text.DecimalFormat;
public class SinDemo extends JFrame {
private double cx = 1, cy = 1;
private double toCx = 1, toCy = 1;
private Random rnd = new Random();
private DecimalFormat df = new DecimalFormat("0.00");
private SinDemo () {
super("Sin-Demo");
setSize(600, 600);
setLocationRelativeTo(null);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
run();
}
private int translateX (double x) {
return (int)(x*getWidth()/Math.PI/4 + getWidth()/2);
}
private int translateY (double y) {
return (int)(getHeight()/2 - y*getWidth()/Math.PI/4);
}
private double sin (double x) {
return (cy * Math.sin(cx * x));
}
@Override
public void paint (Graphics g) {
super.paint(g);
g.setColor(Color.BLUE);
g.drawString("y = " + df.format(cx) + " * sin( " + df.format(cy) + " * x)", 50, 50);
g.setColor(Color.LIGHT_GRAY);
g.drawLine(0, getHeight()/2, getWidth(), getHeight()/2);
g.drawLine(getWidth()/2, 0, getWidth()/2, getHeight());
g.setColor(Color.BLACK);
for (double i=-Math.PI/cx; iMath.PI/cx; i+=0.1)
g.drawLine(translateX(i), translateY(sin(i)),
translateX(i+0.1), translateY(sin(i+0.1)));
}
public void run () {
while (true) {
if (Math.abs(cx - toCx) 0.1) {
toCx = rnd.nextDouble()*2;
toCy = rnd.nextDouble()*2;
}
cx += (toCx - cx)/50;
cy += (toCy - cy)/50;
paint(getGraphics());
try {
Thread.sleep(80);
} catch (InterruptedException ie) {}
}
}
public static void main (String args[]) {
new SinDemo();
}
}
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再给你一个截图：
java中怎样绘制正弦函数图象？
import java.awt.*;
import java.applet.*;
import java.math.*;
import java.awt.event.*;
public class dffg extends Applet implements ActionListener
{
Button bb,bn;
TextField tt;
int aa;
public void init()
{
bb=new Button("画图");
bn=new Button("清除重画");
tt=new TextField(5);
add(bb);
add(tt);
add(bn);
bb.addActionListener(this);
bn.addActionListener(this);
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==bb)
{
int aa=Integer.parseInt(tt.getText());
Graphics g=getGraphics();
for(int i=1;i500;i++)
{
int x=i;
int y=(int)(Math.sin(aa*x*3.14/181)*100+150);
g.drawString("s",x,y);
}
}
if(e.getSource()==bn)
{
repaint();
}
}
}
JAVA画正弦曲线
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
public class SinCos extends JFrame{
private final int WIDTH = 900, HEIGHT = 450;//窗口默认的宽度、高度
private final int offsetX=15;//原点的距离窗口左边空白
private final int offsetY=5; //原点的距离窗口顶边空白
private final int stepX=200; //横向步进
private final int stepY=200; //纵向步进
private final Color colBack = Color.white; //背景颜色
private final Color colText = Color.blue; //文字标签颜色
private final Color colCros = Color.DARK_GRAY; //轴颜色
private final Color colLine = Color.red; //线颜色
private JRadioButton rdSin=new JRadioButton("Sin");
private JRadioButton rdCos=new JRadioButton("Cos");
private JButton btnDraws = new JButton("画线");
private JButton btnClear = new JButton("清空");
private boolean bDraw = false;
public void paint(Graphics g){
super.paint(g); //让父类先处理
int w=getWidth(); //窗口的宽度
int h=getHeight();//窗口的高度
g.setColor(colBack); //底色用白色
g.fillRect(0, 0, w, h); //填充整个窗口
rdSin.repaint();
rdCos.repaint();
btnDraws.repaint();
btnClear.repaint();
if(!bDraw){
return ;
}
int mid_y=(h-offsetY)/2+10;//半高
g.setFont(g.getFont().deriveFont(10f));//字体大小
g.setColor(colCros); //横线和竖线，用深灰色
g.drawLine(0, offsetY+mid_y, w, mid_y+offsetY); //横线中线
g.drawLine(offsetX, offsetY, offsetX, h); //竖线中线
g.setColor(colText); //刻度用蓝色
int maxX=(int)Math.round( (w-offsetX) / stepX);//计算一下横向最大刻度
for(int i=0;i=maxX;i++){
g.drawLine(offsetX+stepX*i, offsetY+mid_y-5, offsetX+stepX*i, offsetY+mid_y+5);//横线刻度,90步进，方便后面画线的计算
g.drawString(String.valueOf(90*i), offsetX+stepX*i-5, offsetY+mid_y+10+5); //刻度是90度
}
int maxY=(int)Math.round( mid_y / stepY);//计算一下纵向最大刻度
for(int i=1;i=maxY;i++){
g.drawLine(offsetX-5, offsetY+mid_y-stepY*i, offsetX+5, offsetY+mid_y-stepY*i);//竖线正刻度,100步进
g.drawString(String.valueOf(stepY*i), offsetX+10, offsetY+mid_y-stepY*i+5);
g.drawLine(offsetX-5, offsetY+mid_y+stepY*i, offsetX+5, offsetY+mid_y+stepY*i);//竖线负刻度,100步进
g.drawString(String.valueOf(-stepY*i), offsetX+10, offsetY+mid_y+stepY*i+5);
}
g.setColor(colLine); //曲线用红色
int x1, y1, x_=-1,y_=0;
for(int i=0; i=w; i++){ //从0度到窗口宽度，开始画Sin()点
x1=((Double)(offsetX+i/90.0*stepX) ).intValue();
if(rdSin.isSelected()){
y1=offsetY+((Double)( mid_y+stepY*Math.sin( Math.toRadians(i) )) ).intValue();
}else{
y1=offsetY+((Double)( mid_y+stepY*Math.cos( Math.toRadians(i) )) ).intValue();
}
if(x_==-1){
x_=x1;y_=y1;
}
g.drawLine(x_, y_, x1, y1);
x_=x1;y_=y1;
}
}
public SinCos(){
super("测试Graphics+Sin/Cos");
this.setSize(WIDTH, HEIGHT);
this.setLayout(null);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
ButtonGroup group = new ButtonGroup();
group.add(rdSin);
group.add(rdCos);
this.getContentPane().add(rdSin);
this.getContentPane().add(rdCos);
this.getContentPane().add(btnDraws);
this.getContentPane().add(btnClear);
this.setVisible(true);
this.doLayout();
btnDraws.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
bDraw=true; SinCos.this.repaint();
}
});
btnClear.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
bDraw=false;SinCos.this.repaint();
}
});
rdSin.setSelected(true);
}
public void doLayout(){
super.doLayout();
rdSin.setBounds(10, 15, 50, 20);
rdCos.setBounds(rdSin.getX()+rdSin.getWidth()+5, 15, 50, 20);
btnDraws.setBounds(rdCos.getX()+rdCos.getWidth()+5, 12, 70, 25);
btnClear.setBounds(btnDraws.getX()+btnDraws.getWidth()+3, 12, 70, 25);
}
public static void main(String[] args){
EventQueue.invokeLater(new Runnable() {
public void run() {
new SinCos();
}
});
}
}
java中怎样绘制正弦函数图象
一下为一个代码示例
import javax.swing.*;
import java.awt.*;
/**
* @author a href="mailto:ge.y.yang@hotmail.com"杨舸/a
* @version 1.0.0
* @since jdk 1.8
*/
class Diagram extends JPanel {
static final int SCALEFACTOR = 200;
int cycles;
int points;
double[] sines;
int[] pts;
Diagram() {
}
public void setCycles(int newCycles) {
cycles = newCycles;
points = SCALEFACTOR * cycles * 2;
sines = new double[points];
for (int i = 0; i points; i++) {
double radians = (Math.PI / SCALEFACTOR) * i;
sines[i] = Math.sin(radians);
}
repaint();
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
int maxWidth = getWidth();
double hstep = (double) maxWidth / (double) points;
int maxHeight = getHeight();
pts = new int[points];
for (int i = 0; i points; i++)
pts[i] = (int) (sines[i] * maxHeight / 2 * .95 + maxHeight / 2);
g.setColor(Color.BLUE);
for (int i = 1; i points; i++) {
int x1 = (int) ((i - 1) * hstep);
int x2 = (int) (i * hstep);
int y1 = pts[i - 1];
int y2 = pts[i];
g.drawLine(x1, y1, x2, y2);
}
}
}
public class Test {
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(500, 200);
Diagram sines = new Diagram();
sines.setCycles(5);
frame.getContentPane().add(sines);
frame.setVisible(true);
}
}
用java代码做正弦波， 求代码
double x=0;
double d=10;
while(x100){
y=sina(x)*d;
//x,y是坐标值，画出来即可
}
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