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468 lines
12 KiB
JavaScript
468 lines
12 KiB
JavaScript
import { getRgbaValue, getColorFromRgbValue } from '../color'
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import { deepClone } from '../plugin/util'
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/**
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* @description Class Style
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* @param {Object} style Style configuration
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* @return {Style} Instance of Style
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*/
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export default class Style {
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constructor (style) {
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this.colorProcessor(style)
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const defaultStyle = {
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/**
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* @description Rgba value of graph fill color
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* @type {Array}
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* @default fill = [0, 0, 0, 1]
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*/
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fill: [0, 0, 0, 1],
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/**
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* @description Rgba value of graph stroke color
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* @type {Array}
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* @default stroke = [0, 0, 0, 1]
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*/
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stroke: [0, 0, 0, 0],
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/**
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* @description Opacity of graph
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* @type {Number}
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* @default opacity = 1
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*/
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opacity: 1,
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/**
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* @description LineCap of Ctx
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* @type {String}
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* @default lineCap = null
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* @example lineCap = 'butt'|'round'|'square'
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*/
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lineCap: null,
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/**
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* @description Linejoin of Ctx
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* @type {String}
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* @default lineJoin = null
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* @example lineJoin = 'round'|'bevel'|'miter'
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*/
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lineJoin: null,
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/**
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* @description LineDash of Ctx
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* @type {Array}
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* @default lineDash = null
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* @example lineDash = [10, 10]
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*/
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lineDash: null,
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/**
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* @description LineDashOffset of Ctx
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* @type {Number}
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* @default lineDashOffset = null
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* @example lineDashOffset = 10
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*/
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lineDashOffset: null,
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/**
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* @description ShadowBlur of Ctx
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* @type {Number}
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* @default shadowBlur = 0
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*/
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shadowBlur: 0,
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/**
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* @description Rgba value of graph shadow color
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* @type {Array}
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* @default shadowColor = [0, 0, 0, 0]
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*/
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shadowColor: [0, 0, 0, 0],
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/**
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* @description ShadowOffsetX of Ctx
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* @type {Number}
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* @default shadowOffsetX = 0
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*/
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shadowOffsetX: 0,
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/**
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* @description ShadowOffsetY of Ctx
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* @type {Number}
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* @default shadowOffsetY = 0
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*/
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shadowOffsetY: 0,
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/**
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* @description LineWidth of Ctx
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* @type {Number}
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* @default lineWidth = 0
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*/
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lineWidth: 0,
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/**
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* @description Center point of the graph
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* @type {Array}
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* @default graphCenter = null
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* @example graphCenter = [10, 10]
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*/
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graphCenter: null,
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/**
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* @description Graph scale
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* @type {Array}
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* @default scale = null
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* @example scale = [1.5, 1.5]
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*/
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scale: null,
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/**
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* @description Graph rotation degree
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* @type {Number}
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* @default rotate = null
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* @example rotate = 10
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*/
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rotate: null,
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/**
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* @description Graph translate distance
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* @type {Array}
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* @default translate = null
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* @example translate = [10, 10]
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*/
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translate: null,
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/**
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* @description Cursor status when hover
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* @type {String}
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* @default hoverCursor = 'pointer'
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* @example hoverCursor = 'default'|'pointer'|'auto'|'crosshair'|'move'|'wait'|...
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*/
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hoverCursor: 'pointer',
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/**
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* @description Font style of Ctx
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* @type {String}
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* @default fontStyle = 'normal'
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* @example fontStyle = 'normal'|'italic'|'oblique'
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*/
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fontStyle: 'normal',
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/**
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* @description Font varient of Ctx
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* @type {String}
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* @default fontVarient = 'normal'
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* @example fontVarient = 'normal'|'small-caps'
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*/
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fontVarient: 'normal',
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/**
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* @description Font weight of Ctx
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* @type {String|Number}
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* @default fontWeight = 'normal'
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* @example fontWeight = 'normal'|'bold'|'bolder'|'lighter'|Number
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*/
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fontWeight: 'normal',
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/**
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* @description Font size of Ctx
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* @type {Number}
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* @default fontSize = 10
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*/
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fontSize: 10,
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/**
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* @description Font family of Ctx
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* @type {String}
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* @default fontFamily = 'Arial'
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*/
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padding:0,
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lineHeight:1,//行高
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wrap:true,//是否自动断行。
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ellipsis:false,//一行，超过省略号。
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letterSpacing:0,
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fontFamily: 'Arial',
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textDecoration:'none',
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/**
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* @description TextAlign of Ctx
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* @type {String}
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* @default textAlign = 'center'
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* @example textAlign = 'start'|'end'|'left'|'right'|'center'
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*/
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textAlign: 'left',
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/**
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* @description TextBaseline of Ctx
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* @type {String}
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* @default textBaseline = 'middle'
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* @example textBaseline = 'top'|'bottom'|'middle'|'alphabetic'|'hanging'
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*/
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textBaseline: 'middle',
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/**
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* @description The color used to create the gradient
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* @type {Array}
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* @default gradientColor = null
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* @example gradientColor = ['#000', '#111', '#222']
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*/
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gradientColor: null,
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/**
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* @description Gradient type
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* @type {String}
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* @default gradientType = 'linear'
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* @example gradientType = 'linear' | 'radial'
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*/
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gradientType: 'linear',
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/**
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* @description Gradient params
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* @type {Array}
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* @default gradientParams = null
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* @example gradientParams = [x0, y0, x1, y1] (Linear Gradient)
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* @example gradientParams = [x0, y0, r0, x1, y1, r1] (Radial Gradient)
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*/
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gradientParams: null,
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/**
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* @description When to use gradients
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* @type {String}
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* @default gradientWith = 'stroke'
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* @example gradientWith = 'stroke' | 'fill'
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*/
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gradientWith: 'stroke',
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/**
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* @description Gradient color stops
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* @type {String}
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* @default gradientStops = 'auto'
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* @example gradientStops = 'auto' | [0, .2, .3, 1]
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*/
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gradientStops: 'auto',
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/**
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* @description Extended color that supports animation transition
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* @type {Array|Object}
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* @default colors = null
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* @example colors = ['#000', '#111', '#222', 'red' ]
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* @example colors = { a: '#000', b: '#111' }
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*/
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colors: null
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}
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Object.assign(this, defaultStyle, style)
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}
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}
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/**
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* @description Set colors to rgba value
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* @param {Object} style style config
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* @param {Boolean} reverse Whether to perform reverse operation
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* @return {Undefined} Void
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*/
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Style.prototype.colorProcessor = function (style, reverse = false) {
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const processor = reverse ? getColorFromRgbValue : getRgbaValue
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const colorProcessorKeys = ['fill', 'stroke', 'shadowColor']
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const allKeys = Object.keys(style)
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const colorKeys = allKeys.filter(key => colorProcessorKeys.find(k => k === key))
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colorKeys.forEach(key => (style[key] = processor(style[key])))
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const { gradientColor, colors } = style
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if (gradientColor) style.gradientColor = gradientColor.map(c => processor(c))
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if (colors) {
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const colorsKeys = Object.keys(colors)
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colorsKeys.forEach(key => (colors[key] = processor(colors[key])))
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}
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}
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/**
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* @description Init graph style
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* @param {Object} ctx Context of canvas
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* @return {Undefined} Void
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*/
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Style.prototype.initStyle = function (ctx,shape) {
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initTransform(ctx, this)
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initGraphStyle(ctx, this)
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initGradient(ctx, this,shape)
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}
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/**
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* @description Init canvas transform
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* @param {Object} ctx Context of canvas
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* @param {Style} style Instance of Style
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* @return {Undefined} Void
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*/
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function initTransform (ctx, style) {
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ctx.save()
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const { graphCenter, rotate, scale, translate } = style
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if (!(graphCenter instanceof Array)) return
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if(graphCenter.length>0) ctx.translate(...graphCenter);
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if (rotate) ctx.rotate(rotate * Math.PI / 180)
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if (scale instanceof Array) ctx.scale(...scale)
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if (translate) ctx.translate(...translate)
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ctx.translate(-graphCenter[0], -graphCenter[1])
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}
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const autoSetStyleKeys = [
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'lineCap', 'lineJoin', 'lineDashOffset',
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'shadowOffsetX', 'shadowOffsetY', 'lineWidth',
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'textAlign', 'textBaseline'
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]
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/**
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* @description Set the style of canvas ctx
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* @param {Object} ctx Context of canvas
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* @param {Style} style Instance of Style
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* @return {Undefined} Void
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*/
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function initGraphStyle (ctx, style) {
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let { fill, stroke, shadowColor, opacity } = style
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autoSetStyleKeys.forEach(key => {
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if (key || typeof key === 'number') ctx[key] = style[key]
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})
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fill = [...fill]
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stroke = [...stroke]
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shadowColor = [...shadowColor]
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fill[3] *= opacity
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stroke[3] *= opacity
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shadowColor[3] *= opacity
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ctx.fillStyle = getColorFromRgbValue(fill)
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ctx.strokeStyle = getColorFromRgbValue(stroke)
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ctx.shadowColor = getColorFromRgbValue(shadowColor)
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let { lineDash, shadowBlur } = style
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if (lineDash) {
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lineDash = lineDash.map(v => v >= 0 ? v : 0)
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ctx.setLineDash(lineDash)
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}
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if (typeof shadowBlur === 'number') ctx.shadowBlur = shadowBlur > 0 ? shadowBlur : 0.001
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const { fontStyle, fontVarient, fontWeight, fontSize, fontFamily } = style
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ctx.font = fontStyle + ' ' + fontVarient + ' ' + fontWeight + ' ' + fontSize + 'px' + ' ' + fontFamily
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}
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/**
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* @description Set the gradient color of canvas ctx
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* @param {Object} ctx Context of canvas
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* @param {Style} style Instance of Style
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* @return {Undefined} Void
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*/
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function initGradient (ctx, style,shape) {
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if (!gradientValidator(style)) return
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let { gradientColor, gradientParams, gradientType, gradientWith, gradientStops, opacity } = style
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gradientColor = gradientColor.map(color => {
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let colorOpacity = color[3] * opacity
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let clonedColor = [...color]
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clonedColor[3] = colorOpacity
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return clonedColor
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})
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gradientColor = gradientColor.map(c => getColorFromRgbValue(c))
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if (gradientStops === 'auto') gradientStops = getAutoColorStops(gradientColor)
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let gra = [...gradientParams];
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if(gradientType =='linear'){
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gra[0] =shape.x + gradientParams[0]
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gra[1] =shape.y + gradientParams[1]
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gra[2] =shape.x +gradientParams[2]
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gra[3] =shape.y +gradientParams[3]
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}
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const gradient = ctx[`create${gradientType.slice(0, 1).toUpperCase() + gradientType.slice(1)}Gradient`](...gra)
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gradientStops.forEach((stop, i) => gradient.addColorStop(stop, gradientColor[i]))
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ctx[`${gradientWith}Style`] = gradient
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}
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/**
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* @description Check if the gradient configuration is legal
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* @param {Style} style Instance of Style
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* @return {Boolean} Check Result
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*/
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function gradientValidator (style) {
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const { gradientColor, gradientParams, gradientType, gradientWith, gradientStops } = style
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if (!gradientColor || !gradientParams) return false
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if (gradientColor.length === 1) {
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console.warn('The gradient needs to provide at least two colors')
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return false
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}
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if (gradientType !== 'linear' && gradientType !== 'radial') {
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console.warn('GradientType only supports linear or radial, current value is ' + gradientType)
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return false
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}
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const gradientParamsLength = gradientParams.length
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if (
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(gradientType === 'linear' && gradientParamsLength !== 4) ||
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(gradientType === 'radial' && gradientParamsLength !== 6)
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) {
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console.warn('The expected length of gradientParams is ' + (gradientType === 'linear' ? '4' : '6'))
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return false
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}
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if (gradientWith !== 'fill' && gradientWith !== 'stroke') {
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console.warn('GradientWith only supports fill or stroke, current value is ' + gradientWith)
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return false
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}
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if (gradientStops !== 'auto' && !(gradientStops instanceof Array)) {
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console.warn(`gradientStops only supports 'auto' or Number Array ([0, .5, 1]), current value is ` + gradientStops)
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return false
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}
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return true
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}
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/**
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* @description Get a uniform gradient color stop
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* @param {Array} color Gradient color
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* @return {Array} Gradient color stop
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*/
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function getAutoColorStops (color) {
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const stopGap = 1 / (color.length - 1)
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return color.map((foo, i) => stopGap * i)
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}
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/**
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* @description Restore canvas ctx transform
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* @param {Object} ctx Context of canvas
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* @return {Undefined} Void
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*/
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Style.prototype.restoreTransform = function (ctx) {
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ctx.restore()
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}
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/**
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* @description Update style data
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* @param {Object} change Changed data
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* @return {Undefined} Void
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*/
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Style.prototype.update = function (change) {
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this.colorProcessor(change)
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Object.assign(this, change)
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}
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/**
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* @description Get the current style configuration
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* @return {Object} Style configuration
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*/
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Style.prototype.getStyle = function () {
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const clonedStyle = deepClone(this, true)
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this.colorProcessor(clonedStyle, true)
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return clonedStyle
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}
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