Commit 2e645cf3 authored by Wenyuan Cui's avatar Wenyuan Cui
Browse files

Update Vector3D.java

parent 1a7bba35

src/main/java/bouncingshape/Vector3D.java

+29 −17
Original line number Diff line number Diff line 
package bouncingshape;



import java.util.Objects;

public class Vector3D {

	//矢量在 x y, z 轴上的分量



	public float x, y, z;

	

	//构造函数，传入矢量的三个分量



    public Vector3D(float x, float y, float z) {

        this.x = x;

        this.y = y;

        this.z = z;

    }

    

    //把 x, y, z赋值为另一个  Vector3D 的 x, y, z



    public void set(Vector3D v) {

        this.x=v.x;

        this.y=v.y;
@@ -23,8 +23,21 @@ public class Vector3D { 
        this.y=y;

        this.z=z;

    }

	@Override

	public boolean equals(Object obj) {

		if (this == obj) return true;

		if (obj == null || getClass() != obj.getClass()) return false;

		Vector3D vector3D = (Vector3D) obj;

		return Float.compare(vector3D.x, x) == 0 &&

				Float.compare(vector3D.y, y) == 0 &&

				Float.compare(vector3D.z, z) == 0;

	}



	@Override

	public int hashCode() {

		return Objects.hash(x, y, z);

	}



    //与另一个矢量相加

    public void add(Vector3D v) {

        this.x+=v.x;

        this.y+=v.y;
@@ -43,7 +56,7 @@ public class Vector3D { 
		this.z += v.z * scaler;

    }

    

    //矢量减法



    public void subtract(Vector3D v) {

    	 this.x-=v.x;

         this.y-=v.y;
@@ -56,7 +69,7 @@ public class Vector3D { 
    	z -= v.z * scaler;

    }

    

    //矢量点积, 结果代表两个矢量之间的相似程度



    public float dot(Vector3D v2){

		return this.x*v2.x + this.y*v2.y + this.z*v2.z;

	}
@@ -65,7 +78,7 @@ public class Vector3D { 
		return this.x*x + this.y*y + this.z*z;

	}

    

    //矢量叉积，来求一个与这两个矢量都垂直的矢量



    public void cross(Vector3D v1, Vector3D v2){

		x = v1.y*v2.z - v1.z*v2.y;

		y = v1.z*v2.x - v1.x*v2.z;
@@ -76,12 +89,12 @@ public class Vector3D { 
		return new Vector3D(y*v.z - z*v.y, z*v.x - x*v.z, x*v.y - y*v.x);

	}

    

    //返回矢量的长度



    public float getLength() {

        return (float) Math.sqrt(x * x + y * y + z * z);

    }

    

    //将矢量单位化



	public void unit(){

		float length = getLength();

		x = x/length;
@@ -89,14 +102,14 @@ public class Vector3D { 
		z = z/length;

	}

	

	//将矢量乘以一个标量



    public void scale(float scalar) {

    	x*=scalar;

		y*=scalar;

		z*=scalar;

    }

    

    //绕 Y 轴旋转矢量，使其顺时针旋转指定角度



  	public void  rotate_Y(int angle){

  		float sin = LookupTables.sin[angle];

  		float cos = LookupTables.cos[angle];
@@ -113,7 +126,7 @@ public class Vector3D { 
  		z = -sin*old_X + cos*old_Z;

  	}



  	//绕 X 轴旋转矢量，使其顺时针旋转指定角度



  	public void rotate_X(int angle){

  		float sin = LookupTables.sin[angle];

  		float cos = LookupTables.cos[angle];
@@ -130,7 +143,7 @@ public class Vector3D { 
  		z = -sin*old_Y + cos*old_Z;

  	}

  	

  	//绕 Z 轴旋转矢量，使其顺时针旋转指定角度



  	public void rotate_Z(int angle){

  		float sin = LookupTables.sin[angle];

  		float cos = LookupTables.cos[angle];
@@ -148,7 +161,6 @@ public class Vector3D { 
  	}

    



	//将Vector3D换成字符串

    public String toString() {

    	return "(" + x + ", " + y + ", " + z + ")";

    }