com.dongbat.game.util.PlaneMathCalculator.java Source code

Introduction

Here is the source code for com.dongbat.game.util.PlaneMathCalculator.java

Source

/*
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package com.dongbat.game.util;

import com.badlogic.gdx.math.Vector2;

/**
 *
 * @author Admin
 */
public class PlaneMathCalculator {

    public static Vector2 getPerpendicularVector(Vector2 oldVector) {
        Vector2 newVector = new Vector2(oldVector.y, -oldVector.x);
        return newVector;
    }

    public static float getAlpha(Vector2 centerPosition, Vector2 collisionPosition, Vector2 bulletDirection) {
        Vector2 perpendicularVector = getPerpendicularVector(bulletDirection.cpy());
        Vector2 centerToConner = collisionPosition.cpy().sub(centerPosition.cpy());
        float angleRad = centerToConner.angleRad(perpendicularVector);
        return angleRad * 2;
    }

    public static float getPercentTaken(Vector2 centerPosition, Vector2 collisionPosition, Vector2 bulletDirection,
            float radius) {
        float alpha = getAlpha(centerPosition, collisionPosition, bulletDirection);
        float percentTaken = getPercentTaken(alpha);
        return percentTaken;
    }

    public static float getPercentTaken(float alpla) {
        return (float) ((alpla - Math.sin(alpla)) / (2 * Math.PI));
    }

    public static Vector2 giaiPtBacNhat2An(float a1, float b1, float c1, float a2, float b2, float c2) {
        float d = a1 * b2 - b1 * a2;
        float dX = c1 * b2 - b1 * c2;
        float dY = a1 * c2 - c1 * a2;
        if (d == 0) {
            //vo nghiem hoac vo so nghiem, ma ke no
            return null;
        }
        Vector2 newVector = new Vector2();
        if (d != 0) {
            newVector.x = dX / d;
            newVector.y = dY / d;
        }
        return newVector;
    }

}