Java 使用drawpolygon方法绘制等边三角形？
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Drawing equilateral triangle using drawpolygon method?
提问by user2999690
How can I draw an equilateral triangle using the graphics method especially the draw polygon method. My issue is that to make an equilateral triangle I need the square root 3/2 and the drawPolygon method I can only use int[],int[],int, the compiler will not let me double because it differ in lengh.
如何使用图形方法尤其是绘制多边形方法绘制等边三角形。我的问题是，要制作一个等边三角形，我需要平方根 3/2 和 drawPolygon 方法，我只能使用 int[],int[],int，编译器不会让我加倍，因为它的长度不同。
Any help is appreciated.
任何帮助表示赞赏。
import java.awt.*;
public class Triangle extends Shape {
// Instance variables
private int leng;
// Constructor
public Triangle(int x, int y, Color color,
int leng) {
super(x, y, color);
this.leng=leng;
}
// Instance methods
public void draw(Graphics g) {
double[] Xcoord = { getX(), getX() + leng, getX() + leng / 2};
double[] Ycoord = { getY(), getY(), getY()*(1.0+ Math.sqrt(3) / (2.0))};
g.drawPolygon(Xcoord,Ycoord,3);
}
public int getHeight() {
return leng;
}
public int getWidth() {
return leng;
}
}
回答by Peter_James
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Polygon;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
public class JRisk {
private JFrame mainMap;
private Polygon poly;
public JRisk() {
initComponents();
}
private void initComponents() {
mainMap = new JFrame();
mainMap.setResizable(false);
mainMap.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
int xPoly[] = {150, 250, 325, 375, 450, 275, 100};
int yPoly[] = {150, 100, 125, 225, 250, 375, 300};
poly = new Polygon(xPoly, yPoly, xPoly.length);
JPanel p = new JPanel() {
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(Color.BLUE);
g.drawPolygon(poly);
}
@Override
public Dimension getPreferredSize() {
return new Dimension(800, 600);
}
};
mainMap.add(p);
mainMap.pack();
mainMap.setVisible(true);
}
/**
* @param args
*/
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new JRisk();
}
});
}
}
This was found from about drawing a Polygon in javaafter searching in google.
这是在谷歌搜索后从关于在java中绘制多边形中发现的。
