Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

public class Main {
    public static void setRotateM(float[] rm, float a, float x, float y, float z) {
        rm[3] = 0;
        rm[7] = 0;
        rm[11] = 0;
        rm[12] = 0;
        rm[13] = 0;
        rm[14] = 0;
        rm[15] = 1;
        a *= (float) (Math.PI / 180.0f);
        float s = (float) Math.sin(a);
        float c = (float) Math.cos(a);
        if (1.0f == x && 0.0f == y && 0.0f == z) {
            rm[5] = c;
            rm[10] = c;
            rm[6] = s;
            rm[9] = -s;
            rm[1] = 0;
            rm[2] = 0;
            rm[4] = 0;
            rm[8] = 0;
            rm[0] = 1;
        } else if (0.0f == x && 1.0f == y && 0.0f == z) {
            rm[0] = c;
            rm[10] = c;
            rm[8] = s;
            rm[2] = -s;
            rm[1] = 0;
            rm[4] = 0;
            rm[6] = 0;
            rm[9] = 0;
            rm[5] = 1;
        } else if (0.0f == x && 0.0f == y && 1.0f == z) {
            rm[0] = c;
            rm[5] = c;
            rm[1] = s;
            rm[4] = -s;
            rm[2] = 0;
            rm[6] = 0;
            rm[8] = 0;
            rm[9] = 0;
            rm[10] = 1;
        } else {
            float len = length(x, y, z);
            if (1.0f != len) {
                float recipLen = 1.0f / len;
                x *= recipLen;
                y *= recipLen;
                z *= recipLen;
            }
            float nc = 1.0f - c;
            float xy = x * y;
            float yz = y * z;
            float zx = z * x;
            float xs = x * s;
            float ys = y * s;
            float zs = z * s;
            rm[0] = x * x * nc + c;
            rm[4] = xy * nc - zs;
            rm[8] = zx * nc + ys;
            rm[1] = xy * nc + zs;
            rm[5] = y * y * nc + c;
            rm[9] = yz * nc - xs;
            rm[2] = zx * nc - ys;
            rm[6] = yz * nc + xs;
            rm[10] = z * z * nc + c;
        }
    }

    /**
     * Computes the length of a vector.
     *
     * @param x x coordinate of a vector
     * @param y y coordinate of a vector
     * @param z z coordinate of a vector
     * @return the length of a vector
     */
    public static float length(float x, float y, float z) {
        return (float) Math.sqrt(x * x + y * y + z * z);
    }
}