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/**
* 内外旋轮曲线
* @module zrender/shape/Trochold
* @author Neil (杨骥, 511415343@qq.com)
* @example
* var Trochold = require('zrender/shape/Trochold');
* var shape = new Trochold({
* style: {
* x: 100,
* y: 100,
* r: 50,
* r0: 30,
* d: 50,
* strokeColor: '#eee',
* text: 'trochold'
* }
* });
* zr.addShape(shape);
*/
/**
* @typedef {Object} ITrocholdStyle
* @property {number} x 中心x坐标
* @property {number} y 中心y坐标
* @property {number} r 固定圆半径 内旋曲线时必须大于转动圆半径
* @property {number} r0 转动圆半径
* @property {number} d 点到内部转动圆的距离，等于r时曲线为摆线
* @property {string} [location='in'] 内旋 out 外旋
* @property {string} [strokeColor='#000000'] 描边颜色
* @property {string} [lineCape='butt'] 线帽样式，可以是 butt, round, square
* @property {number} [lineWidth=1] 描边宽度
* @property {number} [opacity=1] 绘制透明度
* @property {number} [shadowBlur=0] 阴影模糊度，大于0有效
* @property {string} [shadowColor='#000000'] 阴影颜色
* @property {number} [shadowOffsetX=0] 阴影横向偏移
* @property {number} [shadowOffsetY=0] 阴影纵向偏移
* @property {string} [text] 图形中的附加文本
* @property {string} [textColor='#000000'] 文本颜色
* @property {string} [textFont] 附加文本样式，eg:'bold 18px verdana'
* @property {string} [textPosition='end'] 附加文本位置, 可以是 inside, left, right, top, bottom
* @property {string} [textAlign] 默认根据textPosition自动设置，附加文本水平对齐。
* 可以是start, end, left, right, center
* @property {string} [textBaseline] 默认根据textPosition自动设置，附加文本垂直对齐。
* 可以是top, bottom, middle, alphabetic, hanging, ideographic
*/
define(
function (require) {
var Base = require('./Base');
/**
* @alias module:zrender/shape/Trochold
* @param {Object} options
* @constructor
* @extends zrender/shape/Base
*/
var Trochoid = function (options) {
this.brushTypeOnly = 'stroke'; // 线条只能描边，填充后果自负
Base.call(this, options);
/**
* 内外旋轮曲线绘制样式
* @name module:zrender/shape/Trochold#style
* @type {module:zrender/shape/Trochold~ITrocholdStyle}
*/
/**
* 内外旋轮曲线高亮绘制样式
* @name module:zrender/shape/Trochold#highlightStyle
* @type {module:zrender/shape/Trochold~ITrocholdStyle}
*/
};
Trochoid.prototype = {
type: 'trochoid',
/**
* 创建内外旋轮曲线路径
* @param {CanvasRenderingContext2D} ctx
* @param {module:zrender/shape/Trochold~ITrocholdStyle} style
*/
buildPath : function (ctx, style) {
var _x1;
var _y1;
var _x2;
var _y2;
var _R = style.r;
var _r = style.r0;
var _d = style.d;
var _offsetX = style.x;
var _offsetY = style.y;
var _delta = style.location == 'out' ? 1 : -1;
var _math = require('../tool/math');
if (style.location && _R <= _r) {
alert('参数错误');
return;
}
var _num = 0;
var i = 1;
var _theta;
_x1 = (_R + _delta * _r) * _math.cos(0)
- _delta * _d * _math.cos(0) + _offsetX;
_y1 = (_R + _delta * _r) * _math.sin(0)
- _d * _math.sin(0) + _offsetY;
ctx.moveTo(_x1, _y1);
// 计算结束时的i
do {
_num++;
}
while ((_r * _num) % (_R + _delta * _r) !== 0);
do {
_theta = Math.PI / 180 * i;
_x2 = (_R + _delta * _r) * _math.cos(_theta)
- _delta * _d * _math.cos((_R / _r + _delta) * _theta)
+ _offsetX;
_y2 = (_R + _delta * _r) * _math.sin(_theta)
- _d * _math.sin((_R / _r + _delta) * _theta)
+ _offsetY;
ctx.lineTo(_x2, _y2);
i++;
}
while (i <= (_r * _num) / (_R + _delta * _r) * 360);
},
/**
* 返回内外旋轮曲线包围盒矩形
* @param {module:zrender/shape/Trochold~ITrocholdStyle} style
* @return {module:zrender/shape/Base~IBoundingRect}
*/
getRect : function (style) {
if (style.__rect) {
return style.__rect;
}
var _R = style.r;
var _r = style.r0;
var _d = style.d;
var _delta = style.location == 'out' ? 1 : -1;
var _s = _R + _d + _delta * _r;
var _offsetX = style.x;
var _offsetY = style.y;
var lineWidth;
if (style.brushType == 'stroke' || style.brushType == 'fill') {
lineWidth = style.lineWidth || 1;
}
else {
lineWidth = 0;
}
style.__rect = {
x : -_s - lineWidth + _offsetX,
y : -_s - lineWidth + _offsetY,
width : 2 * _s + 2 * lineWidth,
height : 2 * _s + 2 * lineWidth
};
return style.__rect;
}
};
require('../tool/util').inherits(Trochoid, Base);
return Trochoid;
}
);