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java函数曲线运动代码 java 曲线
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java从数据库中读取数据画曲线图
1、自己编写java程序java函数曲线运动代码，也就几十行代码java函数曲线运动代码，先访问数据库取数java函数曲线运动代码，再封装数据.
2、很多啊，eclipse,myeclipse,jbuilder。。。
3、getconnection()
String DBDriver = SysConfig.getProperty("database.defaultProvider.driver");
String DBUser = SysConfig.getProperty("database.defaultProvider.username");
String DBPassword = SysConfig.getProperty("database.defaultProvider.password");
String DBUrl = SysConfig.getProperty("database.defaultProvider.serverURL");
//
Class.forName(DBDriver);
Properties myprop = System.getProperties();
myprop.setProperty("user",DBUser);
myprop.setProperty("password",DBPassword);
conn = DriverManager.getConnection(DBUrl,myprop);
..........
PreparedStatement pstmt = conn.prepareStatement(query);
ResultSet rs = pstmt.executeQuery();
.......
4.下载jfreechart的jar包，调用里面的方法，参考它的api,就是一步一步的多试验下
相关问答
Q1: 基于java图形类实现函数曲线的绘制
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import com.bruceeckel.swing.*;// 这个包你要自己去下，此处无法上传，整个程序你还要修改一下，以满足f(x)=x^2+sin(x)在区间[-3,3]的函数图像
class SineDraw extends JPanel {
static final int SCALEFACTOR = 200;
int cycles;
int points;
double[] sines;
int[] pts;
SineDraw() { setCycles(5); }
public void setCycles(int newCycles) {
cycles = newCycles;
points = SCALEFACTOR * cycles * 2;
sines = new double[points];
pts = new int[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();
for(int i = 0; i points; i++)
pts[i] = (int)(sines[i] * maxHeight/2 * .95
+ maxHeight/2);
g.setColor(Color.red);
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 SineWave extends JApplet {
SineDraw sines = new SineDraw();
JSlider cycles = new JSlider(1, 30, 5);
public void init() {
Container cp = getContentPane();
cp.add(sines);
cycles.addChangeListener(new ChangeListener(){
public void stateChanged(ChangeEvent e) {
System.out.println( ((JSlider)e.getSource()).getValue());
sines.setCycles( ((JSlider)e.getSource()).getValue());
}
});
cp.add(BorderLayout.SOUTH, cycles);
}
public static void main(String[] args) {
Console.run(new SineWave(), 700, 400);
}
} ///:~
Q2: 用java语言绘制正弦曲线
很简单，程序写给你，给分：
---------------------------------------------
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();
}
}
-------------------------------------------------
再给你一个截图：
Q3: 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();
}
});
}
}
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