「java画曲线」java画曲线图
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本文目录一览：
java编程绘制正弦曲线。
写得比较简单哈。
package OnlineUserCount;
import java.awt.*;
import javax.swing.*;
public class Sin extends JPanel{
private double x;
private double y;
@Override
protected void paintComponent(Graphics g) {
// TODO Auto-generated method stub
super.paintComponent(g);
g.setColor(Color.WHITE);//设置面板背景色
g.fillRect(0, 0, 400, 300);//填充面板
g.setColor(Color.RED);//设置画线的颜色
for(x=0;x=360;x+=0.1)//一个周期
{
y=Math.sin(x*Math. PI/180);//转化为弧度,1度=π/180弧度
y=(100+80*y);//便于在屏幕上显示
//g.drawString(".",(int)x,(int)y);//用这种方式也可以
g.drawLine((int)x, (int)y, (int)x,(int) y);//画点
}
}
public static void main(String []args){
Sin s= new Sin();
JFrame j=new JFrame();
j.setTitle("一个周期的正弦曲线");
j.add(s);
j.setSize(400, 300);
j.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
j.setVisible(true);
}
}
//效果截图
java编程绘制正弦曲线是什么？
写得比较简单哈。
package OnlineUserCount;
import java.awt.*;
import javax.swing.*;
public class Sin extends JPanel{
private double x;
private double y;
@Override
protected void paintComponent(Graphics g) {
// TODO Auto-generated method stub
super.paintComponent(g);
g.setColor(Color.WHITE);//设置面板背景色
g.fillRect(0, 0, 400, 300);//填充面板
g.setColor(Color.RED);//设置画线的颜色
for(x=0;x=360;x+=0.1)//一个周期
{
y=Math.sin(x*Math. PI/180);//转化为弧度,1度=π/180弧度
y=(100+80*y);//便于在屏幕上显示
//g.drawString(".",(int)x,(int)y);//用这种方式也可以
g.drawLine((int)x, (int)y, (int)x,(int) y);//画点
}
}
public static void main(String []args){
Sin s= new Sin();
JFrame j=new JFrame();
j.setTitle("一个周期的正弦曲线");
j.add(s);
j.setSize(400, 300);
j.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
j.setVisible(true);
}
}
//效果截图
java怎样绘制螺旋曲线
用极坐标方程，一个点一个点的画。给你段我以前写的程序，虽然不是螺旋曲线，但也差不多。import java.awt.*;
import javax.swing.*;public class Spirograph extends JApplet {
public static void main(String s[]) {
JFrame frame = new JFrame();
frame.setTitle("Spirograph");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JApplet applet = new Spirograph();
applet.init();
frame.getContentPane().add(applet);
frame.pack();
frame.setVisible(true);
}
public void init() {
JPanel panel = new SpiroPanel();
getContentPane().add(panel);
}
}class SpiroPanel extends JPanel{
int nPoints = 1000;
double r1 = 60;
double r2 = 50;
double p = 70;
public SpiroPanel() {
setPreferredSize(new Dimension(400, 400));
setBackground(Color.white);
} public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D)g;
g2.translate(200,200);
int x1=(int)(r1+r2-p);
int y1=0;
int x2;
int y2;
for (int i=0; inPoints; i++) {
double t = i*Math.PI/90;
x2 = (int)((r1+r2)*Math.cos(t)-p*Math.cos((r1+r2)*t/r2));
y2 = (int)((r1+r2)*Math.sin(t)-p*Math.sin((r1+r2)*t/r2));
g2.drawLine(x1, y1, x2, y2);
x1 = x2;
y1 = y2;
}
}
}
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 怎么画一个曲线
我做了一个简单的例子，还没有完善好，只是起到一个抛砖引玉的作用，希望你能自己把它补完整。
package test;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.border.LineBorder;
public class DrawFn extends JFrame{
private JTextField txt_interval;
private JTextField txt_c;
private JTextField txt_b;
private JTextField txt_a;
private drawFnPanel panel = new drawFnPanel();
/**
* @param args
*/
public static void main(String[] args) {
DrawFn frame=new DrawFn();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
public DrawFn() {
super();
getContentPane().setLayout(null);
final JLabel aLabel = new JLabel();
aLabel.setText("a=");
aLabel.setBounds(10, 10, 21, 18);
getContentPane().add(aLabel);
txt_a = new JTextField();
txt_a.setBounds(31, 8, 87, 22);
getContentPane().add(txt_a);
final JLabel bLabel = new JLabel();
bLabel.setText("b=");
bLabel.setBounds(136, 10, 21, 18);
getContentPane().add(bLabel);
txt_b = new JTextField();
txt_b.setBounds(159, 8, 87, 22);
getContentPane().add(txt_b);
final JLabel cLabel = new JLabel();
cLabel.setText("c=");
cLabel.setBounds(267, 10, 32, 18);
getContentPane().add(cLabel);
txt_c = new JTextField();
txt_c.setBounds(290, 8, 87, 22);
getContentPane().add(txt_c);
final JLabel label = new JLabel();
label.setText("步长=");
label.setBounds(398, 10, 47, 18);
getContentPane().add(label);
txt_interval = new JTextField();
txt_interval.setBounds(440, 8, 87, 22);
getContentPane().add(txt_interval);
final JButton button = new JButton();
button.addActionListener(new draw_actionAdapter(this));
button.setText("绘制");
button.setBounds(533, 5, 61, 28);
getContentPane().add(button);
panel.setBorder(new LineBorder(Color.black, 1, false));
panel.setBounds(10, 36, 599, 389);
getContentPane().add(panel);
}
public void paintFn(ActionEvent e){
panel.paintFn(Integer.parseInt(txt_a.getText()), Integer.parseInt(txt_b.getText()), Integer.parseInt(txt_c.getText()), Integer.parseInt(txt_interval.getText()));
}
}
class drawFnPanel extends JPanel{
private int _a=0;
private int _b=0;
private int _c=0;
private float _interval=0.01f;
public void paintFn(int a,int b,int c,int interval){
_a=a;
_b=b;
_c=c;
_interval=interval;
repaint();
}
private double getY(float x){
return _a*x*x+_b*x+_c;
}
public void paintComponent(Graphics g){
Graphics2D g2d=(Graphics2D)g;
if(_a==0 _b==0 _c==0){
return;
}
for(float i=-100f;i100f;i=i+_interval){
g2d.drawRect((int)i, (int)getY(i), 1, 1);
}
}
}
class draw_actionAdapter implements ActionListener{
private DrawFn adapter;
public draw_actionAdapter(DrawFn adapter){
this.adapter=adapter;
}
public void actionPerformed(ActionEvent e) {
adapter.paintFn(e);
}
java画曲线的介绍就聊到这里吧，感谢你花时间阅读本站内容，更多关于java画曲线图、java画曲线的信息别忘了在本站进行查找喔。