package?Javagames.util;

public?class?Matrix3x3f?{
????public?static?final?int?DIMENSION?=?3;
????private?float[][]?m?=?new?float[DIMENSION][DIMENSION];
????//m[2][2]=0時，只對第一次向量變換有效，變換后，w?=?0

????public?Matrix3x3f（）?{}

????public?Matrix3x3f（float[][]?m）?{
????????setMatrix（m）;
????}

????public?Matrix3x3f?add（Matrix3x3f?m1）?{
????????float[][]?tmp?=?new?float[DIMENSION][DIMENSION];
????????for?（int?i?=?0;?i?????????????for?（int?j?=?0;?j?????????????????tmp[i][j]?=?m[i][j]?+?m1.m[i][j];
????????????}
????????}
????????return?new?Matrix3x3f（tmp）;
????}

????public?Matrix3x3f?sub（Matrix3x3f?m1）?{
????????float[][]?tmp?=?new?float[DIMENSION][DIMENSION];
????????for?（int?i?=?0;?i?????????????for?（int?j?=?0;?j?????????????????tmp[i][j]?=?m[i][j]?-?m1.m[i][j];
????????????}
????????}
????????return?new?Matrix3x3f（tmp）;
????}

????public?Matrix3x3f?mul（Matrix3x3f?m1）?{
????????float[][]?tmp?=?new?float[DIMENSION][DIMENSION];
????????for?（int?i?=?0;?i?????????????for?（int?k?=?0;?k?????????????????for（int?j=0;j????????????????????tmp[i][j]?+=?m[i][k]?*?m1.m[k][j];
????????????????}
????????????}
????????}
????????return?new?Matrix3x3f（tmp）;
????}

????public?void?setMatrix（float[][]?m）?{
????????if?（m.length?==?DIMENSION?&&?m[0].length?==?DIMENSION）?{
????????????this.m?=?m;
????????}
????}

????public?static?Matrix3x3f?zero（）?{
????????return?new?Matrix3x3f（new?float[DIMENSION][DIMENSION]）;
????}

????public?static?Matrix3x3f?identity（）?{
????????float[][]?tmp?=?new?float[DIMENSION][DIMENSION];
????????for?（int?i?=?0;?i?????????????tmp[i][i]?=?1.0f;
????????}
????????return?new?Matrix3x3f（tmp）;
????}

????public?static?Matrix3x3f?translate（Vector2f?v）?{
????????return?translate（v.x?v.y）;
????}

????public?static?Matrix3x3f?translate（float?x?float?y）?{
????????return?new?Matrix3x