cube.java

立方体透视投影绘图程序

package pjt;

public class Cube {

	private double a=100;
	private double theta=0, t;
	double[] px, py, pz;
	
	public void setA(double a) {
		if(a>0)
			this.a = a;
	}
	
	public void create() {
		px = new double[9];
		py = new double[9];
		pz = new double[9];
		px[1]=px[2]=px[5]=px[6]=a;
		px[3]=px[4]=px[7]=px[8]=-a;
		py[1]=py[2]=py[3]=py[4]=a;
		py[5]=py[6]=py[7]=py[8]=-a;
		pz[1]=pz[4]=pz[5]=pz[8]=a;
		pz[2]=pz[3]=pz[6]=pz[7]=-a;
	}
	
	public void whirl() {
		t = theta*Math.PI/180;
		for (int i=1; i<9; i++) {
			px[0] = px[i];
			pz[0] = pz[i];
			px[i] = px[0]*Math.cos(t) + pz[0]*Math.sin(t);
			pz[i] = pz[0]*Math.cos(t) - px[0]*Math.sin(t);
		}
	}
	
	public void setTheta (double theta) {
		this.theta = theta;
	}
}