An Open Source library for multi-touch, WebGL powered applications.
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<li class="parent " data-name="DeepZoomImage#destroyTilesAboveLevel"><a href="DeepZoomImage.html#destroyTilesAboveLevel">destroyTilesAboveLevel</a></li>
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<li class="parent " data-name="DeepZoomImage#ensureTiles"><a href="DeepZoomImage.html#ensureTiles">ensureTiles</a></li>
<li class="parent " data-name="DeepZoomImage#levelAndAlphaForScale"><a href="DeepZoomImage.html#levelAndAlphaForScale">levelAndAlphaForScale</a></li>
<li class="parent " data-name="DeepZoomImage#levelForScale"><a href="DeepZoomImage.html#levelForScale">levelForScale</a></li>
<li class="parent " data-name="DeepZoomImage#neededTiles"><a href="DeepZoomImage.html#neededTiles">neededTiles</a></li>
<li class="parent " data-name="DeepZoomImage#populateAllTiles"><a href="DeepZoomImage.html#populateAllTiles">populateAllTiles</a></li>
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<span class="subtitle">Methods</span>
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<a href="LabeledGraphics.html">LabeledGraphics</a>
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<span class="subtitle">Methods</span>
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<a href="LabeledGraphics.exports.LabeledGraphics.html">LabeledGraphics.exports.LabeledGraphics</a>
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<span class="subtitle">Methods</span>
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<span class="title ">
<a href="ModalInteractivePopup.html">ModalInteractivePopup</a>
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<ul class="typedefs itemMembers">
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<li class="item" data-name="PIXIApp">
<span class="title ">
<a href="PIXIApp.html">PIXIApp</a>
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<li class="parent " data-name="PIXIApp#center"><a href="PIXIApp.html#center">center</a></li>
<li class="parent " data-name="PIXIApp#size"><a href="PIXIApp.html#size">size</a></li>
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<ul class="methods itemMembers">
<span class="subtitle">Methods</span>
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<li class="parent " data-name="PIXIApp#checkOrientation"><a href="PIXIApp.html#checkOrientation">checkOrientation</a></li>
<li class="parent " data-name="PIXIApp#convertPointFromNodeToPage"><a href="PIXIApp.html#convertPointFromNodeToPage">convertPointFromNodeToPage</a></li>
<li class="parent " data-name="PIXIApp#convertPointFromPageToNode"><a href="PIXIApp.html#convertPointFromPageToNode">convertPointFromPageToNode</a></li>
<li class="parent " data-name="PIXIApp#draw"><a href="PIXIApp.html#draw">draw</a></li>
<li class="parent " data-name="PIXIApp#expandRenderer"><a href="PIXIApp.html#expandRenderer">expandRenderer</a></li>
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<div class="main">
<h1 class="page-title" data-filename="pixi_labeledgraphics.js.html">Source: pixi/labeledgraphics.js</h1>
<section>
<header>
<div class="header content-size">
<h2>pixi/labeledgraphics.js</h2>
</div>
</header>
<article>
<pre id="source-code" class="prettyprint source linenums"><code>/**
* Defines usefull default text styles.
*/
export class FontInfo {
static get small() {
return app.theme.textStyleSmall
}
static get normal() {
return app.theme.textStyle
}
static get centered() {
return Object.assign({}, app.theme.textStyle, { align: 'center' })
}
}
/**
* Static methods to support hyphenation of lines.
*
* @class Hypenate
*/
export class Hypenate {
static splitPart(part) {
let parts = part.split('-')
if (parts.length == 1) return [part]
let result = []
let last = parts.pop()
for (let p of parts) {
result.push(p + '-')
}
result.push(last)
return result.filter(p => p.length > 0)
}
static splitWord(word) {
if (typeof language == 'undefined') {
if (word.indexOf('-') > -1) {
return word.split('-')
}
return [word]
}
let parts = language.hyphenate(word)
let result = []
for (let part of parts) {
for (let splitted of this.splitPart(part)) {
result.push(splitted)
}
}
return result
}
static abbreviateLine(label, style, width) {
const pixiStyle = new PIXI.TextStyle(style)
let metrics = PIXI.TextMetrics.measureText(label, pixiStyle)
while (metrics.width > width &amp;&amp; label.length > 3) {
label = label.slice(0, label.length - 1)
metrics = PIXI.TextMetrics.measureText(label, pixiStyle)
}
label = label.slice(0, label.length - 1)
return label + '…'
}
static splitLine(line, pixiStyle, width, space, minus) {
let x = 0
let result = ''
let words = line.split(' ')
for (let word of words) {
let wordMetrics = PIXI.TextMetrics.measureText(word, pixiStyle)
if (x + wordMetrics.width >= width) {
let parts = this.splitWord(word)
let newWord = ''
if (parts.length == 1) {
newWord += '\n' + word + ' '
x = wordMetrics.width + space.width
} else {
let first = true
let lastPart = ''
for (let part of parts) {
let partMetrics = PIXI.TextMetrics.measureText(
part,
pixiStyle
)
if (x + partMetrics.width + space.width > width) {
newWord +=
(first || lastPart.endsWith('-')
? '\n'
: '-\n') + part
x = partMetrics.width
} else {
newWord += part
x += partMetrics.width
}
lastPart = part
first = false
}
x += space.width
}
result += newWord + ' '
} else {
result += word + ' '
x += wordMetrics.width + space.width
}
}
return result
}
/**
* Main method and entry point for text hyphenation
*
* @static
* @param {*} text
* @param {*} style
* @param {*} width
* @memberof Hypenate
* @returns {string}
*/
static splitLines(text, style, width) {
const pixiStyle = new PIXI.TextStyle(style)
const lines = text.split('\n')
const space = PIXI.TextMetrics.measureText(' ', pixiStyle)
const minus = PIXI.TextMetrics.measureText('-', pixiStyle)
let result = []
for (let line of lines) {
result.push(this.splitLine(line, pixiStyle, width, space, minus))
}
return result.join('\n')
}
}
class TextLabel extends PIXI.Text {
/**
*Creates an instance of TextLabel.
* @param {string} text - The string that you would like the text to display
* @param {object|PIXI.TextStyle} [style] - The style parameters
* @param {canvas}
* @memberof TextLabel
*/
constructor(
text,
style = null,
canvas = null,
{ minZoom = 0.1, maxZoom = 10 } = {}
) {
super(text, style, canvas)
this.normFontSize = this.style.fontSize
this.minZoom = minZoom
this.maxZoom = maxZoom
}
zoom(factor) {
let oldValue = parseFloat(this.style.fontSize) / this.normFontSize
let value = oldValue * factor
this.setZoom(value)
}
setZoom(value) {
let oldValue = parseFloat(this.style.fontSize) / this.normFontSize
if (value > this.maxZoom) {
value = this.maxZoom
}
if (value &lt; this.minZoom) {
value = this.minZoom
}
if (value != oldValue) {
this.style.fontSize = Math.max(value * this.normFontSize, 1)
}
}
setZoomAndScale(scale) {
this.scale.set(1 / scale)
this.setZoom(scale)
}
}
/**
* A specialization of the PIXI.Graphics class that allows to
* resuse and place labels across different layout variants
*
* @export
* @class LabeledGraphics
* @extends {PIXI.Graphics}
*/
export class LabeledGraphics extends PIXI.Graphics {
/**
* Creates an instance of LabeledGraphics and defines a local label cache.
*
* @memberof LabeledGraphics
*/
constructor() {
super()
this.labels = new Map()
}
_createText(label, fontInfo) {
return new TextLabel(label, fontInfo)
}
/**
* Main additional method. Ensures that a text object is created that is cached
* under the given key.
*
* @param {*} key - The cache key
* @param {*} label - The label to show
* @param {*} [attrs={}] - Defines attributes of the text object.
* align: 'right', 'left', or 'center'
* justify: 'top', 'bottom', or 'center'
* maxLines: {integer} truncates the text and adds ellipsis
* maxHeight: {number} truncates text that needs more space and adds ellipsis
* maxWidth: {number} word wraps text using hyphenation if possible
* @param {*} [fontInfo=FontInfo.normal] - Defines PIXI.TextStyle attributes
* @returns {PIXI.Text} - instance
* @memberof LabeledGraphics
*/
ensureLabel(key, label, attrs = {}, fontInfo = FontInfo.normal) {
if (attrs.maxWidth &amp;&amp; attrs.maxLines == 1) {
label = Hypenate.abbreviateLine(label, fontInfo, attrs.maxWidth)
} else {
if (attrs.maxWidth) {
label = Hypenate.splitLines(label, fontInfo, attrs.maxWidth)
}
if (attrs.maxLines) {
label = this.truncateLabel(label, fontInfo, attrs.maxLines)
}
if (attrs.maxHeight) {
let styleInfo = new PIXI.TextStyle(fontInfo)
let metrics = PIXI.TextMetrics.measureText(label, styleInfo)
let maxLines = Math.max(attrs.maxHeight / metrics.lineHeight, 1)
label = this.truncateLabel(label, fontInfo, maxLines)
}
}
if (!this.labels.has(key)) {
let text = this._createText(label, fontInfo)
this.labels.set(key, text)
this.addChild(text)
}
let text = this.labels.get(key)
for (let k in attrs) {
text[k] = attrs[k]
}
if (label != text.text) text.text = label
// We do not follow the flexbox jargon and use align for x and justify for y axis
// This deviation is needed to ensure backward compatability
switch (attrs.justify || null) {
case 'top':
text.anchor.y = 0
break
case 'bottom':
text.anchor.x = 1
break
default:
text.anchor.y = 0.5
break
}
switch (attrs.align) {
case 'right':
text.anchor.x = 1
break
case 'center':
text.anchor.x = 0.5
break
default:
text.anchor.x = 0
break
}
text.visible = true
return text
}
/**
* Private method that truncates the text and adds an ellipsis if there are more lines
* than wanted
*
* @param {*} text
* @param {*} style
* @param {*} [maxLines=Infinity]
* @returns {string}
* @memberof LabeledGraphics
*/
truncateLabel(text, style, maxLines = Infinity) {
if (maxLines === Infinity) {
return text
}
const { wordWrapWidth } = style
const pixiStyle = new PIXI.TextStyle(style)
const { lines } = PIXI.TextMetrics.measureText(text, pixiStyle)
let newText = text
if (lines.length > maxLines) {
const truncatedLines = lines.slice(0, maxLines)
const lastLine = truncatedLines[truncatedLines.length - 1]
const words = lastLine.split(' ')
const wordMetrics = PIXI.TextMetrics.measureText(
`\u00A0\n...\n${words.join('\n')}`,
pixiStyle
)
const [
spaceLength,
dotsLength,
...wordLengths
] = wordMetrics.lineWidths
const { text: newLastLine } = wordLengths.reduce(
(data, wordLength, i) => {
if (
data.length + wordLength + spaceLength >=
wordWrapWidth
) {
return { ...data, length: wordWrapWidth }
}
return {
text: `${data.text}${i > 0 ? ' ' : ''}${words[i]}`,
length: data.length + wordLength + spaceLength
}
},
{ text: '', length: dotsLength }
)
truncatedLines[truncatedLines.length - 1] = `${newLastLine}...`
newText = truncatedLines.join('\n')
}
return newText
}
/**
* Returns the label for the given key.
*
* @param {*} key
* @returns {Object}
* @memberof LabeledGraphics
*/
getLabel(key) {
return this.labels.get(key)
}
/**
* Hides the label with the given key.
* @param {*} key
* @memberof LabeledGraphics
*/
hideLabel(key) {
let label = this.labels.get(key)
if (label) {
label.visible = false
}
}
/**
* Removes the label with the given key.
* @param {*} key
* @memberof LabeledGraphics
*/
removeLabel(key) {
let label = this.labels.get(key)
this.labels.delete(key)
label.destroy()
}
/**
* Ensures that labels are hidden on clear.
*
* @memberof LabeledGraphics
*/
clear() {
super.clear()
for (let key of this.labels.keys()) {
this.hideLabel(key)
}
}
/**
* Logs debugging infos
*
* @memberof LabeledGraphics
*/
debugInfos() {
console.log({ size: this.labels.size, labels: this.labels })
}
}
const labelCache = new Map()
function getTexture(label, fontInfo = FontInfo.normal) {
let key = label + fontInfo.fontFamily + fontInfo.fontSize
if (labelCache.has(key)) {
return labelCache.get(key)
}
let expandedFont = Object.assign({}, fontInfo)
expandedFont.fontSize *= window.devicePixelRatio
let text = new PIXI.Text(label, expandedFont)
text.updateText()
labelCache.set(key, text.texture)
return text.texture
}
class SpriteLabel extends PIXI.Sprite {
constructor(label, fontInfo) {
let texture = getTexture(label, fontInfo)
super(texture)
this.label = label
this.fontInfo = fontInfo
this.scale.set(0.8 / window.devicePixelRatio)
}
set text(label) {
this.label = label
this.texture = getTexture(label, this.fontInfo)
}
get text() {
return this.label
}
}
export class BitmapLabeledGraphics extends LabeledGraphics {
_createText(label, fontInfo) {
let texture = getTexture(label, fontInfo)
return new SpriteLabel(texture)
}
}
</code></pre>
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