'use strict'
var orient = require('robust-orientation')
var vec2 = require('vec2')
var segment2 = require('segment2')
var mouseChange = require('mouse-change')
var segCrosses = require('robust-segment-intersect')
var fit = require('canvas-fit')
var cleanupPSLG = require('../clean-pslg')
//Create canvas and context
var canvas = document.createElement('canvas')
var context = canvas.getContext('2d')
document.body.appendChild(canvas)
window.addEventListener('resize', fit(canvas), false)
var optionDiv = document.createElement('div')
optionDiv.style.position = 'absolute'
optionDiv.style.left = '5px'
optionDiv.style.top = '5px'
optionDiv.style['z-index'] = '10'
document.body.appendChild(optionDiv)
var points = []
var edges = []
var cleanPoints = []
var cleanEdges = []
function dataChanged() {
cleanPoints = points.map(function(p) { return [p[0], p[1]] })
cleanEdges = edges.map(function(e) { return [e[0], e[1]] })
cleanupPSLG(cleanPoints, cleanEdges)
}
for(var i=0; i<10; ++i) {
var x = Math.random() * 0.8 - 0.4
var y = Math.random() * 0.8 - 0.4
points.push([0.5+x,0.5+y], [0.5-x,0.5-y])
edges.push([2*i, 2*i+1])
}
dataChanged()
var resetButton = document.createElement('input')
resetButton.type = 'button'
resetButton.value = 'reset'
resetButton.addEventListener('click', function() {
points.length = edges.length = 0
dataChanged()
})
var resetP = document.createElement('p')
resetP.appendChild(resetButton)
optionDiv.appendChild(resetP)
var description = document.createElement('p')
description.innerHTML = 'click to add/remove points
drag to add edges
Project page'
optionDiv.appendChild(description)
function edgeDistance(a, b, c) {
var p = vec2(c[0], c[1])
return segment2(vec2(a[0], a[1]), vec2(b[0], b[1])).closestPointTo(p).distance(p)
}
function isValidEdge(a, b) {
return true
}
var lastButtons = 0,
highlightPoint = -1,
startPoint = -1,
highlightEdge = -1,
activeEdge = null
mouseChange(canvas, function(buttons, x, y) {
var s = Math.min(canvas.width, canvas.height)
var lx = (x - canvas.width/2) / s + 0.5
var ly = (y - canvas.height/2) / s + 0.5
var closestDist = 0.0125
highlightPoint = -1
highlightEdge = -1
for(var i=0; i= 0) {
edges.splice(highlightEdge, 1)
dataChanged()
highlightEdge = -1
} else if(highlightPoint < 0) {
points.push([lx, ly])
dataChanged()
} else {
startPoint = highlightPoint
activeEdge = [ points[highlightPoint], [lx, ly] ]
}
} else if(!!lastButtons && !buttons) {
if(startPoint >= 0) {
if(highlightPoint === startPoint) {
points.splice(highlightPoint, 1)
var nedges = []
discard_edge:
for(var i=0; i highlightPoint) {
e[j] -= 1
} else if(e[j] === highlightPoint) {
continue discard_edge
}
}
nedges.push(e)
}
edges = nedges
highlightPoint = -1
dataChanged()
} else if(highlightPoint >= 0) {
if(isValidEdge(points[startPoint], points[highlightPoint])) {
edges.push([startPoint, highlightPoint])
dataChanged()
}
}
startPoint = -1
activeEdge = null
}
} else if(!!buttons) {
if(activeEdge) {
activeEdge[1] = [lx, ly]
}
}
lastButtons = buttons
})
function line(a, b) {
var x0 = a[0]-0.5
var y0 = a[1]-0.5
var x1 = b[0]-0.5
var y1 = b[1]-0.5
var w = canvas.width
var h = canvas.height
var s = Math.min(w, h)
context.beginPath()
context.moveTo(s*x0 + w/2, s*y0 + h/2)
context.lineTo(s*x1 + w/2, s*y1 + h/2)
context.stroke()
}
function circle(x, y, r) {
var w = canvas.width
var h = canvas.height
var s = Math.min(w, h)
context.beginPath()
context.moveTo(s*x, s*y)
context.arc(s*(x-0.5) + w/2, s*(y-0.5) + h/2, r, 0.0, 2.0*Math.PI)
context.fill()
}
var EDGE_PALETTE = [
'rgba(255,0,0,0.25)',
'rgba(0,255,0,0.25)',
'rgba(0,0,255,0.25)',
'rgba(255,255,0,0.25)',
'rgba(255,0,255,0.25)',
'rgba(0,255,255,0.25)'
]
function draw() {
requestAnimationFrame(draw)
var w = canvas.width
var h = canvas.height
context.fillStyle = '#fff'
context.fillRect(0, 0, w, h)
for(var i=0; i= 0) {
var e = edges[highlightEdge]
context.strokeStyle = '#f00'
line(points[e[0]], points[e[1]])
}
for(var i=0; i