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Mini Shell
Mini Shell
/**
* 提供变换扩展
* @module zrender/mixin/Transformable
* @author pissang (https://www.github.com/pissang)
*/
define(function (require) {
'use strict';
var matrix = require('../core/matrix');
var vector = require('../core/vector');
var mIdentity = matrix.identity;
var EPSILON = 5e-5;
function isNotAroundZero(val) {
return val > EPSILON || val < -EPSILON;
}
/**
* @alias module:zrender/mixin/Transformable
* @constructor
*/
var Transformable = function (opts) {
opts = opts || {};
// If there are no given position, rotation, scale
if (!opts.position) {
/**
* 平移
* @type {Array.<number>}
* @default [0, 0]
*/
this.position = [0, 0];
}
if (opts.rotation == null) {
/**
* 旋转
* @type {Array.<number>}
* @default 0
*/
this.rotation = 0;
}
if (!opts.scale) {
/**
* 缩放
* @type {Array.<number>}
* @default [1, 1]
*/
this.scale = [1, 1];
}
/**
* 旋转和缩放的原点
* @type {Array.<number>}
* @default null
*/
this.origin = this.origin || null;
};
var transformableProto = Transformable.prototype;
transformableProto.transform = null;
/**
* 判断是否需要有坐标变换
* 如果有坐标变换, 则从position, rotation, scale以及父节点的transform计算出自身的transform矩阵
*/
transformableProto.needLocalTransform = function () {
return isNotAroundZero(this.rotation)
|| isNotAroundZero(this.position[0])
|| isNotAroundZero(this.position[1])
|| isNotAroundZero(this.scale[0] - 1)
|| isNotAroundZero(this.scale[1] - 1);
};
transformableProto.updateTransform = function () {
var parent = this.parent;
var parentHasTransform = parent && parent.transform;
var needLocalTransform = this.needLocalTransform();
var m = this.transform;
if (!(needLocalTransform || parentHasTransform)) {
m && mIdentity(m);
return;
}
m = m || matrix.create();
if (needLocalTransform) {
this.getLocalTransform(m);
}
else {
mIdentity(m);
}
// 应用父节点变换
if (parentHasTransform) {
if (needLocalTransform) {
matrix.mul(m, parent.transform, m);
}
else {
matrix.copy(m, parent.transform);
}
}
// 保存这个变换矩阵
this.transform = m;
this.invTransform = this.invTransform || matrix.create();
matrix.invert(this.invTransform, m);
};
transformableProto.getLocalTransform = function (m) {
m = m || [];
mIdentity(m);
var origin = this.origin;
var scale = this.scale;
var rotation = this.rotation;
var position = this.position;
if (origin) {
// Translate to origin
m[4] -= origin[0];
m[5] -= origin[1];
}
matrix.scale(m, m, scale);
if (rotation) {
matrix.rotate(m, m, rotation);
}
if (origin) {
// Translate back from origin
m[4] += origin[0];
m[5] += origin[1];
}
m[4] += position[0];
m[5] += position[1];
return m;
};
/**
* 将自己的transform应用到context上
* @param {Context2D} ctx
*/
transformableProto.setTransform = function (ctx) {
var m = this.transform;
if (m) {
ctx.transform(m[0], m[1], m[2], m[3], m[4], m[5]);
}
};
var tmpTransform = [];
/**
* 分解`transform`矩阵到`position`, `rotation`, `scale`
*/
transformableProto.decomposeTransform = function () {
if (!this.transform) {
return;
}
var parent = this.parent;
var m = this.transform;
if (parent && parent.transform) {
// Get local transform and decompose them to position, scale, rotation
matrix.mul(tmpTransform, parent.invTransform, m);
m = tmpTransform;
}
var sx = m[0] * m[0] + m[1] * m[1];
var sy = m[2] * m[2] + m[3] * m[3];
var position = this.position;
var scale = this.scale;
if (isNotAroundZero(sx - 1)) {
sx = Math.sqrt(sx);
}
if (isNotAroundZero(sy - 1)) {
sy = Math.sqrt(sy);
}
if (m[0] < 0) {
sx = -sx;
}
if (m[3] < 0) {
sy = -sy;
}
position[0] = m[4];
position[1] = m[5];
scale[0] = sx;
scale[1] = sy;
this.rotation = Math.atan2(-m[1] / sy, m[0] / sx);
};
/**
* Get global scale
* @return {Array.<number>}
*/
transformableProto.getGlobalScale = function () {
var m = this.transform;
if (!m) {
return [1, 1];
}
var sx = Math.sqrt(m[0] * m[0] + m[1] * m[1]);
var sy = Math.sqrt(m[2] * m[2] + m[3] * m[3]);
if (m[0] < 0) {
sx = -sx;
}
if (m[3] < 0) {
sy = -sy;
}
return [sx, sy];
};
/**
* 变换坐标位置到 shape 的局部坐标空间
* @method
* @param {number} x
* @param {number} y
* @return {Array.<number>}
*/
transformableProto.transformCoordToLocal = function (x, y) {
var v2 = [x, y];
var invTransform = this.invTransform;
if (invTransform) {
vector.applyTransform(v2, v2, invTransform);
}
return v2;
};
/**
* 变换局部坐标位置到全局坐标空间
* @method
* @param {number} x
* @param {number} y
* @return {Array.<number>}
*/
transformableProto.transformCoordToGlobal = function (x, y) {
var v2 = [x, y];
var transform = this.transform;
if (transform) {
vector.applyTransform(v2, v2, transform);
}
return v2;
};
return Transformable;
});
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