关于java编程的转折性问题 如何用不同策略画出写sin函数曲线,写出核心部分代码 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 mport java.awt.Color;import java.awt.Graphics;import java.awt.Polygon;import javax.swing.JFrame;import javax.swing.JPanel;public class DrawSinFunction extends JPanel{ private static final long serialVersionUID = 1L; public static void main(String[] args) { JFrame frame = new JFrame("Sin(x)"); frame.getContentPane().add(new DrawSinFunction()); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(600, 400); frame.setVisible(true); } protected void paintComponent(Graphics g) { super.paintComponent(g); g.setColor(Color.blue); g.drawLine(25,180, 575, 180); g.drawLine(300, 20, 300, 360); g.drawString("Y", 302, 20); g.drawString("X", 575, 190); Polygon p = new Polygon(); for(int x = -100; x <= 200; x ++) { p.addPoint(x + 250, 180-(int)(50*Math.sin((x/100.0)*2*Math.PI))); } g.drawPolygon(p); }}这是我写的,试试吧 能给我点分不? 这是改进以后的!import java.awt.Color;import java.awt.Graphics;import java.awt.Polygon;import javax.swing.JFrame;import javax.swing.JPanel;public class DrawSinFunction extends JPanel{ private static final long serialVersionUID = 1L; public static void main(String[] args) { JFrame frame = new JFrame("Sin(x)"); frame.getContentPane().add(new DrawSinFunction()); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(600, 400); frame.setVisible(true); } protected void paintComponent(Graphics g) { super.paintComponent(g); g.setColor(Color.blue); g.drawLine(25,180, 575, 180); g.drawLine(300, 20, 300, 360); g.drawString("Y", 302, 20); g.drawString("X", 575, 190); Polygon p = new Polygon(); for(int x = -100; x <= 100; x ++) { p.addPoint(x + 300, 180-(int)(80*Math.sin(((x + 300)/200.0)*2*Math.PI))); } g.drawPolygon(p); }} 抱歉,这是最终版!import java.awt.Color;import java.awt.Graphics;import java.awt.Polygon;import javax.swing.JFrame;import javax.swing.JPanel;public class DrawSinFunction extends JPanel{ private static final long serialVersionUID = 1L; public static void main(String[] args) { JFrame frame = new JFrame("Sin(x)"); frame.getContentPane().add(new DrawSinFunction()); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(600, 400); frame.setVisible(true); } protected void paintComponent(Graphics g) { super.paintComponent(g); g.setColor(Color.blue); g.drawLine(25,180, 575, 180); g.drawLine(300, 20, 300, 360); g.drawString("Y", 302, 20); g.drawString("X", 575, 190); Polygon p = new Polygon(); for(int x = -100; x <= 100; x ++) { p.addPoint(x + 300, 180-(int)(80*Math.sin(((x + 300)/200.0)*2*Math.PI))); } g.drawPolygon(p); }}注释: 在for循环中的 -100 到 100 为一个周期的长度 ,也就是200300 和 180 分别是所画的坐标系的原点在画板上的位置, 80只是一个缩放比例(可以任意选择) equals和==的区别,搞混了! 求助 JAVA菜鸟在线等回答 Oracle SQL小问题 又是java包的问题 请教高手帮看看数据库连接问题 大家谁做过这样的程序,能给我一份吗 JPanel 布局问题 破产求解 关于UI设计中图像的问题 如何在java中操作映射盘(网络盘)的文件? 菜鸟问题!请各位看看吧! 为什么图片按钮没有显示图片!? 请问:关于对象指向null表示什么意思?
import java.awt.Graphics;
import java.awt.Polygon;
import javax.swing.JFrame;
import javax.swing.JPanel;public class DrawSinFunction extends JPanel{
private static final long serialVersionUID = 1L; public static void main(String[] args) {
JFrame frame = new JFrame("Sin(x)");
frame.getContentPane().add(new DrawSinFunction());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(600, 400);
frame.setVisible(true);
} protected void paintComponent(Graphics g) {
super.paintComponent(g); g.setColor(Color.blue);
g.drawLine(25,180, 575, 180);
g.drawLine(300, 20, 300, 360);
g.drawString("Y", 302, 20);
g.drawString("X", 575, 190);
Polygon p = new Polygon();
for(int x = -100; x <= 200; x ++) {
p.addPoint(x + 250, 180-(int)(50*Math.sin((x/100.0)*2*Math.PI)));
}
g.drawPolygon(p);
}
}
这是我写的,试试吧 能给我点分不?
import java.awt.Graphics;
import java.awt.Polygon;
import javax.swing.JFrame;
import javax.swing.JPanel;public class DrawSinFunction extends JPanel{
private static final long serialVersionUID = 1L; public static void main(String[] args) {
JFrame frame = new JFrame("Sin(x)");
frame.getContentPane().add(new DrawSinFunction());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(600, 400);
frame.setVisible(true);
} protected void paintComponent(Graphics g) {
super.paintComponent(g); g.setColor(Color.blue);
g.drawLine(25,180, 575, 180);
g.drawLine(300, 20, 300, 360);
g.drawString("Y", 302, 20);
g.drawString("X", 575, 190);
Polygon p = new Polygon();
for(int x = -100; x <= 100; x ++) {
p.addPoint(x + 300, 180-(int)(80*Math.sin(((x + 300)/200.0)*2*Math.PI)));
}
g.drawPolygon(p);
}
}
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Polygon;
import javax.swing.JFrame;
import javax.swing.JPanel;public class DrawSinFunction extends JPanel{
private static final long serialVersionUID = 1L; public static void main(String[] args) {
JFrame frame = new JFrame("Sin(x)");
frame.getContentPane().add(new DrawSinFunction());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(600, 400);
frame.setVisible(true);
} protected void paintComponent(Graphics g) {
super.paintComponent(g); g.setColor(Color.blue);
g.drawLine(25,180, 575, 180);
g.drawLine(300, 20, 300, 360);
g.drawString("Y", 302, 20);
g.drawString("X", 575, 190);
Polygon p = new Polygon();
for(int x = -100; x <= 100; x ++) {
p.addPoint(x + 300, 180-(int)(80*Math.sin(((x + 300)/200.0)*2*Math.PI)));
}
g.drawPolygon(p);
}
}注释: 在for循环中的 -100 到 100 为一个周期的长度 ,也就是200
300 和 180 分别是所画的坐标系的原点在画板上的位置, 80只是一个缩放比例(可以任意选择)