75 lines
1.8 KiB
JavaScript
75 lines
1.8 KiB
JavaScript
/* globals Y, d3 */
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let y = new Y('drawing-example', {
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connector: {
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name: 'websockets-client',
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url: 'http://127.0.0.1:1234'
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}
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})
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window.yDrawing = y
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var drawing = y.define('drawing', Y.Array)
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var renderPath = d3.svg.line()
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.x(function (d) { return d[0] })
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.y(function (d) { return d[1] })
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.interpolate('basic')
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var svg = d3.select('#drawingCanvas')
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.call(d3.behavior.drag()
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.on('dragstart', dragstart)
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.on('drag', drag)
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.on('dragend', dragend))
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// create line from a shared array object and update the line when the array changes
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function drawLine (yarray) {
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var line = svg.append('path').datum(yarray.toArray())
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line.attr('d', renderPath)
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yarray.observe(function (event) {
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line.remove()
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line = svg.append('path').datum(yarray.toArray())
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line.attr('d', renderPath)
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})
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}
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// call drawLine every time an array is appended
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drawing.observe(function (event) {
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event.removedElements.forEach(function () {
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// if one is deleted, all will be deleted!!
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svg.selectAll('path').remove()
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})
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event.addedElements.forEach(function (path) {
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drawLine(path)
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})
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})
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// draw all existing content
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for (var i = 0; i < drawing.length; i++) {
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drawLine(drawing.get(i))
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}
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// clear canvas on request
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document.querySelector('#clearDrawingCanvas').onclick = function () {
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drawing.delete(0, drawing.length)
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}
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var sharedLine = null
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function dragstart () {
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drawing.insert(drawing.length, [Y.Array])
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sharedLine = drawing.get(drawing.length - 1)
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}
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// After one dragged event is recognized, we ignore them for 33ms.
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var ignoreDrag = null
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function drag () {
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if (sharedLine != null && ignoreDrag == null) {
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ignoreDrag = window.setTimeout(function () {
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ignoreDrag = null
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}, 10)
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sharedLine.push([d3.mouse(this)])
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}
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}
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function dragend () {
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sharedLine = null
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window.clearTimeout(ignoreDrag)
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ignoreDrag = null
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}
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