svgedit
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Powerful SVG-Editor for your browser
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JavaScript
/**
* @file ext-polystar.js
*
*
* @copyright 2010 CloudCanvas, Inc. All rights reserved
* @copyright 2021 Optimistik SAS, Inc. All rights reserved
* @license MIT
*
*/
const name = 'polystar'
const loadExtensionTranslation = async function (svgEditor) {
let translationModule
const lang = svgEditor.configObj.pref('lang')
try {
translationModule = await import(`./locale/${lang}.js`)
} catch (_error) {
console.warn(`Missing translation (${lang}) for ${name} - using 'en'`)
translationModule = await import('./locale/en.js')
}
svgEditor.i18next.addResourceBundle(lang, name, translationModule.default)
}
export default {
name,
async init () {
const svgEditor = this
const { svgCanvas } = svgEditor
const { ChangeElementCommand } = svgCanvas.history
const addToHistory = (cmd) => { svgCanvas.undoMgr.addCommandToHistory(cmd) }
const { $id, $click } = svgCanvas
let selElems
let started
let newFO
await loadExtensionTranslation(svgEditor)
/**
* @param {boolean} on true=display
* @param {string} tool "star" or "polygone"
* @returns {void}
*/
const showPanel = (on, tool) => {
if (on) {
$id(`${tool}_panel`).style.removeProperty('display')
} else {
$id(`${tool}_panel`).style.display = 'none'
}
}
/**
*
* @param {string} attr attribute to change
* @param {string|Float} val new value
* @returns {void}
*/
const setAttr = (attr, val) => {
svgCanvas.changeSelectedAttribute(attr, val)
svgCanvas.call('changed', selElems)
}
/**
* @param {Float} n angle
* @return {Float} cotangeante
*/
const cot = (n) => 1 / Math.tan(n)
/**
* @param {Float} n angle
* @returns {Float} sec
*/
const sec = (n) => 1 / Math.cos(n)
return {
name: svgEditor.i18next.t(`${name}:name`),
// The callback should be used to load the DOM with the appropriate UI items
callback () {
// Add the button and its handler(s)
// Note: the star extension needs to be loaded before the polygon extension
const fbtitle = `${name}:title`
const titleStar = `${name}:buttons.0.title`
const titlePolygon = `${name}:buttons.1.title`
const buttonTemplate = `
<se-flyingbutton id="tools_polygon" title="${fbtitle}">
<se-button id="tool_star" title="${titleStar}" src="star.svg">
</se-button>
<se-button id="tool_polygon" title="${titlePolygon}" src="polygon.svg">
</se-button>
</se-flyingbutton>
`
svgCanvas.insertChildAtIndex($id('tools_left'), buttonTemplate, 10)
// handler
$click($id('tool_star'), () => {
if (this.leftPanel.updateLeftPanel('tool_star')) {
svgCanvas.setMode('star')
showPanel(true, 'star')
showPanel(false, 'polygon')
}
})
$click($id('tool_polygon'), () => {
if (this.leftPanel.updateLeftPanel('tool_polygon')) {
svgCanvas.setMode('polygon')
showPanel(true, 'polygon')
showPanel(false, 'star')
}
})
const label0 = `${name}:contextTools.0.label`
const title0 = `${name}:contextTools.0.title`
const label1 = `${name}:contextTools.1.label`
const title1 = `${name}:contextTools.1.title`
const label2 = `${name}:contextTools.2.label`
const title2 = `${name}:contextTools.2.title`
const label3 = `${name}:contextTools.3.label`
const title3 = `${name}:contextTools.3.title`
// Add the context panel and its handler(s)
const panelTemplate = document.createElement('template')
panelTemplate.innerHTML = `
<div id="star_panel">
<se-spin-input id="starNumPoints" label="${label0}" min=1 step=1 value=5 title="${title0}">
</se-spin-input>
<se-spin-input id="RadiusMultiplier" label="${label1}" min=1 step=2.5 value=3 title="${title1}">
</se-spin-input>
<se-spin-input id="radialShift" min=0 step=1 value=0 label="${label2}" title="${title2}">
</se-spin-input>
</div>
<div id="polygon_panel">
<se-spin-input size="3" id="polySides" min=1 step=1 value=5 label="${label3}" title="${title3}">
</se-spin-input>
</div>
`
// add handlers for the panel
$id('tools_top').appendChild(panelTemplate.content.cloneNode(true))
// don't display the panels on start
showPanel(false, 'star')
showPanel(false, 'polygon')
$id('starNumPoints').addEventListener('change', (event) => {
setAttr('point', event.target.value)
const orient = 'point'
const point = event.target.value
let i = selElems.length
while (i--) {
const elem = selElems[i]
if (elem.hasAttribute('r')) {
const oldPoint = elem.getAttribute('point')
const oldPoints = elem.getAttribute('points')
const radialshift = elem.getAttribute('radialshift')
let xpos = 0
let ypos = 0
if (elem.points) {
const list = elem.points
const len = list.numberOfItems
for (let i = 0; i < len; ++i) {
const pt = list.getItem(i)
xpos += parseFloat(pt.x)
ypos += parseFloat(pt.y)
}
const cx = xpos / len
const cy = ypos / len
const circumradius = Number(elem.getAttribute('r'))
const inradius = circumradius / elem.getAttribute('starRadiusMultiplier')
let polyPoints = ''
for (let s = 0; point >= s; s++) {
let angle = 2.0 * Math.PI * (s / point)
if (orient === 'point') {
angle -= Math.PI / 2
} else if (orient === 'edge') {
angle = angle + Math.PI / point - Math.PI / 2
}
let x = circumradius * Math.cos(angle) + cx
let y = circumradius * Math.sin(angle) + cy
polyPoints += x + ',' + y + ' '
if (!isNaN(inradius)) {
angle = 2.0 * Math.PI * (s / point) + Math.PI / point
if (orient === 'point') {
angle -= Math.PI / 2
} else if (orient === 'edge') {
angle = angle + Math.PI / point - Math.PI / 2
}
angle += radialshift
x = inradius * Math.cos(angle) + cx
y = inradius * Math.sin(angle) + cy
polyPoints += x + ',' + y + ' '
}
}
elem.setAttribute('points', polyPoints)
addToHistory(new ChangeElementCommand(elem, { point: oldPoint, points: oldPoints }))
}
}
}
})
$id('RadiusMultiplier').addEventListener('change', (event) => {
setAttr('starRadiusMultiplier', event.target.value)
})
$id('radialShift').addEventListener('change', (event) => {
setAttr('radialshift', event.target.value)
})
$id('polySides').addEventListener('change', (event) => {
setAttr('sides', event.target.value)
const sides = event.target.value
let i = selElems.length
while (i--) {
const elem = selElems[i]
if (elem.hasAttribute('edge')) {
const oldSides = elem.getAttribute('sides')
const oldPoints = elem.getAttribute('points')
let xpos = 0
let ypos = 0
if (elem.points) {
const list = elem.points
const len = list.numberOfItems
for (let i = 0; i < len; ++i) {
const pt = list.getItem(i)
xpos += parseFloat(pt.x)
ypos += parseFloat(pt.y)
}
const cx = xpos / len
const cy = ypos / len
const edg = elem.getAttribute('edge')
const inradius = (edg / 2) * cot(Math.PI / sides)
const circumradius = inradius * sec(Math.PI / sides)
let points = ''
for (let s = 0; sides >= s; s++) {
const angle = (2.0 * Math.PI * s) / sides
const x = circumradius * Math.cos(angle) + cx
const y = circumradius * Math.sin(angle) + cy
points += x + ',' + y + ' '
}
elem.setAttribute('points', points)
addToHistory(new ChangeElementCommand(elem, { sides: oldSides, points: oldPoints }))
}
}
}
})
},
mouseDown (opts) {
if (svgCanvas.getMode() === 'star') {
const fill = svgCanvas.getColor('fill')
const stroke = svgCanvas.getColor('stroke')
const strokeWidth = svgCanvas.getStrokeWidth()
started = true
newFO = svgCanvas.addSVGElementsFromJson({
element: 'polygon',
attr: {
cx: opts.start_x,
cy: opts.start_y,
id: svgCanvas.getNextId(),
shape: 'star',
point: $id('starNumPoints').value,
r: 0,
radialshift: $id('radialShift').value,
r2: 0,
orient: 'point',
fill,
stroke,
'stroke-width': strokeWidth
}
})
return {
started: true
}
}
if (svgCanvas.getMode() === 'polygon') {
const fill = svgCanvas.getColor('fill')
const stroke = svgCanvas.getColor('stroke')
const strokeWidth = svgCanvas.getStrokeWidth()
started = true
newFO = svgCanvas.addSVGElementsFromJson({
element: 'polygon',
attr: {
cx: opts.start_x,
cy: opts.start_y,
id: svgCanvas.getNextId(),
shape: 'regularPoly',
sides: $id('polySides').value,
orient: 'x',
edge: 0,
fill,
stroke,
'stroke-width': strokeWidth
}
})
return {
started: true
}
}
return undefined
},
mouseMove (opts) {
if (!started) {
return undefined
}
if (svgCanvas.getMode() === 'star') {
const cx = Number(newFO.getAttribute('cx'))
const cy = Number(newFO.getAttribute('cy'))
const point = Number(newFO.getAttribute('point'))
const orient = newFO.getAttribute('orient')
const fill = newFO.getAttribute('fill')
const stroke = newFO.getAttribute('stroke')
const strokeWidth = Number(newFO.getAttribute('stroke-width'))
const radialshift = Number(newFO.getAttribute('radialshift'))
let x = opts.mouse_x
let y = opts.mouse_y
const circumradius =
Math.sqrt((x - cx) * (x - cx) + (y - cy) * (y - cy)) / 1.5
const RadiusMultiplier = document.getElementById('RadiusMultiplier').value
const inradius =
circumradius / RadiusMultiplier
newFO.setAttribute('r', circumradius)
newFO.setAttribute('r2', inradius)
newFO.setAttribute('starRadiusMultiplier', RadiusMultiplier)
let polyPoints = ''
for (let s = 0; point >= s; s++) {
let angle = 2.0 * Math.PI * (s / point)
if (orient === 'point') {
angle -= Math.PI / 2
} else if (orient === 'edge') {
angle = angle + Math.PI / point - Math.PI / 2
}
x = circumradius * Math.cos(angle) + cx
y = circumradius * Math.sin(angle) + cy
polyPoints += x + ',' + y + ' '
if (!isNaN(inradius)) {
angle = 2.0 * Math.PI * (s / point) + Math.PI / point
if (orient === 'point') {
angle -= Math.PI / 2
} else if (orient === 'edge') {
angle = angle + Math.PI / point - Math.PI / 2
}
angle += radialshift
x = inradius * Math.cos(angle) + cx
y = inradius * Math.sin(angle) + cy
polyPoints += x + ',' + y + ' '
}
}
newFO.setAttribute('points', polyPoints)
newFO.setAttribute('fill', fill)
newFO.setAttribute('stroke', stroke)
newFO.setAttribute('stroke-width', strokeWidth)
/* const shape = */ newFO.getAttribute('shape')
return {
started: true
}
}
if (svgCanvas.getMode() === 'polygon') {
const cx = Number(newFO.getAttribute('cx'))
const cy = Number(newFO.getAttribute('cy'))
const sides = Number(newFO.getAttribute('sides'))
// const orient = newFO.getAttribute('orient');
const fill = newFO.getAttribute('fill')
const stroke = newFO.getAttribute('stroke')
const strokeWidth = Number(newFO.getAttribute('stroke-width'))
let x = opts.mouse_x
let y = opts.mouse_y
const edg =
Math.sqrt((x - cx) * (x - cx) + (y - cy) * (y - cy)) / 1.5
newFO.setAttribute('edge', edg)
const inradius = (edg / 2) * cot(Math.PI / sides)
const circumradius = inradius * sec(Math.PI / sides)
let points = ''
for (let s = 0; sides >= s; s++) {
const angle = (2.0 * Math.PI * s) / sides
x = circumradius * Math.cos(angle) + cx
y = circumradius * Math.sin(angle) + cy
points += x + ',' + y + ' '
}
// const poly = newFO.createElementNS(NS.SVG, 'polygon');
newFO.setAttribute('points', points)
newFO.setAttribute('fill', fill)
newFO.setAttribute('stroke', stroke)
newFO.setAttribute('stroke-width', strokeWidth)
return {
started: true
}
}
return undefined
},
mouseUp () {
if (svgCanvas.getMode() === 'star') {
const r = newFO.getAttribute('r')
return {
keep: r !== '0',
element: newFO
}
}
if (svgCanvas.getMode() === 'polygon') {
const edge = newFO.getAttribute('edge')
const keep = edge !== '0'
// svgCanvas.addToSelection([newFO], true);
return {
keep,
element: newFO
}
}
return undefined
},
selectedChanged (opts) {
// Use this to update the current selected elements
selElems = opts.elems
let i = selElems.length
// Hide panels if nothing is selected
if (!i) {
showPanel(false, 'star')
showPanel(false, 'polygon')
return
}
while (i--) {
const elem = selElems[i]
if (elem?.getAttribute('shape') === 'star') {
if (opts.selectedElement && !opts.multiselected) {
$id('starNumPoints').value = elem.getAttribute('point')
$id('radialShift').value = elem.getAttribute('radialshift')
showPanel(true, 'star')
} else {
showPanel(false, 'star')
}
} else if (elem?.getAttribute('shape') === 'regularPoly') {
if (opts.selectedElement && !opts.multiselected) {
$id('polySides').value = elem.getAttribute('sides')
showPanel(true, 'polygon')
} else {
showPanel(false, 'polygon')
}
} else {
showPanel(false, 'star')
showPanel(false, 'polygon')
}
}
}
}
}
}