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define(
function () {
var ArrayCtor = typeof Float32Array === 'undefined'
? Array
: Float32Array;
/**
* @typedef {Float32Array|Array.<number>} Vector2
*/
/**
* 二维向量类
* @exports zrender/tool/vector
*/
var vector = {
/**
* 创建一个向量
* @param {number} [x=0]
* @param {number} [y=0]
* @return {Vector2}
*/
create: function (x, y) {
var out = new ArrayCtor(2);
out[0] = x || 0;
out[1] = y || 0;
return out;
},
/**
* 复制一个向量
* @return {Vector2} out
* @return {Vector2} v
*/
copy: function (out, v) {
out[0] = v[0];
out[1] = v[1];
return out;
},
/**
* 设置向量的两个项
* @param {Vector2} out
* @param {number} a
* @param {number} b
* @return {Vector2} 结果
*/
set: function (out, a, b) {
out[0] = a;
out[1] = b;
return out;
},
/**
* 向量相加
* @param {Vector2} out
* @param {Vector2} v1
* @param {Vector2} v2
*/
add: function (out, v1, v2) {
out[0] = v1[0] + v2[0];
out[1] = v1[1] + v2[1];
return out;
},
/**
* 向量缩放后相加
* @param {Vector2} out
* @param {Vector2} v1
* @param {Vector2} v2
* @param {number} a
*/
scaleAndAdd: function (out, v1, v2, a) {
out[0] = v1[0] + v2[0] * a;
out[1] = v1[1] + v2[1] * a;
return out;
},
/**
* 向量相减
* @param {Vector2} out
* @param {Vector2} v1
* @param {Vector2} v2
*/
sub: function (out, v1, v2) {
out[0] = v1[0] - v2[0];
out[1] = v1[1] - v2[1];
return out;
},
/**
* 向量长度
* @param {Vector2} v
* @return {number}
*/
len: function (v) {
return Math.sqrt(this.lenSquare(v));
},
/**
* 向量长度平方
* @param {Vector2} v
* @return {number}
*/
lenSquare: function (v) {
return v[0] * v[0] + v[1] * v[1];
},
/**
* 向量乘法
* @param {Vector2} out
* @param {Vector2} v1
* @param {Vector2} v2
*/
mul: function (out, v1, v2) {
out[0] = v1[0] * v2[0];
out[1] = v1[1] * v2[1];
return out;
},
/**
* 向量除法
* @param {Vector2} out
* @param {Vector2} v1
* @param {Vector2} v2
*/
div: function (out, v1, v2) {
out[0] = v1[0] / v2[0];
out[1] = v1[1] / v2[1];
return out;
},
/**
* 向量点乘
* @param {Vector2} v1
* @param {Vector2} v2
* @return {number}
*/
dot: function (v1, v2) {
return v1[0] * v2[0] + v1[1] * v2[1];
},
/**
* 向量缩放
* @param {Vector2} out
* @param {Vector2} v
* @param {number} s
*/
scale: function (out, v, s) {
out[0] = v[0] * s;
out[1] = v[1] * s;
return out;
},
/**
* 向量归一化
* @param {Vector2} out
* @param {Vector2} v
*/
normalize: function (out, v) {
var d = vector.len(v);
if (d === 0) {
out[0] = 0;
out[1] = 0;
}
else {
out[0] = v[0] / d;
out[1] = v[1] / d;
}
return out;
},
/**
* 计算向量间距离
* @param {Vector2} v1
* @param {Vector2} v2
* @return {number}
*/
distance: function (v1, v2) {
return Math.sqrt(
(v1[0] - v2[0]) * (v1[0] - v2[0])
+ (v1[1] - v2[1]) * (v1[1] - v2[1])
);
},
/**
* 向量距离平方
* @param {Vector2} v1
* @param {Vector2} v2
* @return {number}
*/
distanceSquare: function (v1, v2) {
return (v1[0] - v2[0]) * (v1[0] - v2[0])
+ (v1[1] - v2[1]) * (v1[1] - v2[1]);
},
/**
* 求负向量
* @param {Vector2} out
* @param {Vector2} v
*/
negate: function (out, v) {
out[0] = -v[0];
out[1] = -v[1];
return out;
},
/**
* 插值两个点
* @param {Vector2} out
* @param {Vector2} v1
* @param {Vector2} v2
* @param {number} t
*/
lerp: function (out, v1, v2, t) {
// var ax = v1[0];
// var ay = v1[1];
out[0] = v1[0] + t * (v2[0] - v1[0]);
out[1] = v1[1] + t * (v2[1] - v1[1]);
return out;
},
/**
* 矩阵左乘向量
* @param {Vector2} out
* @param {Vector2} v
* @param {Vector2} m
*/
applyTransform: function (out, v, m) {
var x = v[0];
var y = v[1];
out[0] = m[0] * x + m[2] * y + m[4];
out[1] = m[1] * x + m[3] * y + m[5];
return out;
},
/**
* 求两个向量最小值
* @param {Vector2} out
* @param {Vector2} v1
* @param {Vector2} v2
*/
min: function (out, v1, v2) {
out[0] = Math.min(v1[0], v2[0]);
out[1] = Math.min(v1[1], v2[1]);
return out;
},
/**
* 求两个向量最大值
* @param {Vector2} out
* @param {Vector2} v1
* @param {Vector2} v2
*/
max: function (out, v1, v2) {
out[0] = Math.max(v1[0], v2[0]);
out[1] = Math.max(v1[1], v2[1]);
return out;
}
};
vector.length = vector.len;
vector.lengthSquare = vector.lenSquare;
vector.dist = vector.distance;
vector.distSquare = vector.distanceSquare;
return vector;
}
);