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/**
* 水滴形状
* @module zrender/shape/Ellipse
* @example
* var Ellipse = require('zrender/shape/Ellipse');
* var shape = new Ellipse({
* style: {
* x: 100,
* y: 100,
* a: 40,
* b: 20,
* brushType: 'both',
* color: 'blue',
* strokeColor: 'red',
* lineWidth: 3,
* text: 'Ellipse'
* }
* });
* zr.addShape(shape);
*/
/**
* @typedef {Object} IEllipseStyle
* @property {number} x 圆心x坐标
* @property {number} y 圆心y坐标
* @property {number} a 横轴半径
* @property {number} b 纵轴半径
* @property {string} [brushType='fill']
* @property {string} [color='#000000'] 填充颜色
* @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/Ellipse
* @constructor
* @extends module:zrender/shape/Base
* @param {Object} options
*/
var Ellipse = function(options) {
Base.call(this, options);
/**
* 椭圆绘制样式
* @name module:zrender/shape/Ellipse#style
* @type {module:zrender/shape/Ellipse~IEllipseStyle}
*/
/**
* 椭圆高亮绘制样式
* @name module:zrender/shape/Ellipse#highlightStyle
* @type {module:zrender/shape/Ellipse~IEllipseStyle}
*/
};
Ellipse.prototype = {
type: 'ellipse',
/**
* 构建椭圆的Path
* @param {CanvasRenderingContext2D} ctx
* @param {module:zrender/shape/Ellipse~IEllipseStyle} style
*/
buildPath : function(ctx, style) {
var k = 0.5522848;
var x = style.x;
var y = style.y;
var a = style.a;
var b = style.b;
var ox = a * k; // 水平控制点偏移量
var oy = b * k; // 垂直控制点偏移量
// 从椭圆的左端点开始顺时针绘制四条三次贝塞尔曲线
ctx.moveTo(x - a, y);
ctx.bezierCurveTo(x - a, y - oy, x - ox, y - b, x, y - b);
ctx.bezierCurveTo(x + ox, y - b, x + a, y - oy, x + a, y);
ctx.bezierCurveTo(x + a, y + oy, x + ox, y + b, x, y + b);
ctx.bezierCurveTo(x - ox, y + b, x - a, y + oy, x - a, y);
ctx.closePath();
},
/**
/**
* 计算返回椭圆包围盒矩形。
* @param {module:zrender/shape/Ellipse~IEllipseStyle} style
* @return {module:zrender/shape/Base~IBoundingRect}
*/
getRect : function(style) {
if (style.__rect) {
return style.__rect;
}
var lineWidth;
if (style.brushType == 'stroke' || style.brushType == 'fill') {
lineWidth = style.lineWidth || 1;
}
else {
lineWidth = 0;
}
style.__rect = {
x : Math.round(style.x - style.a - lineWidth / 2),
y : Math.round(style.y - style.b - lineWidth / 2),
width : style.a * 2 + lineWidth,
height : style.b * 2 + lineWidth
};
return style.__rect;
}
};
require('../tool/util').inherits(Ellipse, Base);
return Ellipse;
}
);