MIF_E31211879/desain/assets/node_modules/echarts/util/shape/GaugePointer.js

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/**
* zrender
*
* @author Kener (@Kener-林峰, kener.linfeng@gmail.com)
*
* shape类仪表盘指针
* 可配图形属性:
{
// 基础属性
shape : 'gauge-pointer', // 必须shape类标识需要显式指定
id : {string}, // 必须,图形唯一标识,可通过'zrender/tool/guid'方法生成
zlevel : {number}, // 默认为0z层level决定绘画在哪层canvas中
invisible : {boolean}, // 默认为false是否可见
// 样式属性,默认状态样式样式属性
style : {
xStart : {number}, // 必须,起点横坐标
yStart : {number}, // 必须,起点纵坐标
xEnd : {number}, // 必须,终点横坐标
yEnd : {number}, // 必须,终点纵坐标
strokeColor : {color}, // 默认为'#000'线条颜色轮廓支持rgba
lineWidth : {number}, // 线条宽度
},
// 交互属性详见shape.Base
// 事件属性详见shape.Base
}
*/
define(function (require) {
var Base = require('zrender/shape/Base');
var zrUtil = require('zrender/tool/util');
function GaugePointer(options) {
Base.call(this, options);
}
GaugePointer.prototype = {
type: 'gauge-pointer',
/**
* 创建矩形路径
* @param {Context2D} ctx Canvas 2D上下文
* @param {Object} style 样式
*/
buildPath : function (ctx, style) {
var r = style.r;
var width = style.width;
var angle = style.angle;
var x = style.x - Math.cos(angle) * width * (width >= r / 3 ? 1 : 2);
var y = style.y + Math.sin(angle) * width * (width >= r / 3 ? 1 : 2);
angle = style.angle - Math.PI / 2;
ctx.moveTo(x, y);
ctx.lineTo(
style.x + Math.cos(angle) * width,
style.y - Math.sin(angle) * width
);
ctx.lineTo(
style.x + Math.cos(style.angle) * r,
style.y - Math.sin(style.angle) * r
);
ctx.lineTo(
style.x - Math.cos(angle) * width,
style.y + Math.sin(angle) * width
);
ctx.lineTo(x, y);
return;
},
/**
* 返回矩形区域,用于局部刷新和文字定位
* @param {Object} style
*/
getRect : function(style) {
if (style.__rect) {
return style.__rect;
}
var width = style.width * 2;
var xStart = style.x;
var yStart = style.y;
var xEnd = xStart + Math.cos(style.angle) * style.r;
var yEnd = yStart - Math.sin(style.angle) * style.r;
style.__rect = {
x : Math.min(xStart, xEnd) - width,
y : Math.min(yStart, yEnd) - width,
width : Math.abs(xStart - xEnd) + width,
height : Math.abs(yStart - yEnd) + width
};
return style.__rect;
},
isCover : require('./normalIsCover')
};
zrUtil.inherits(GaugePointer, Base);
return GaugePointer;
});