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<html>
<head>
<title> Triangle Mesh Generation </title>
</head>
<body style='margin:0px; display: block:'>
<svg id='demoSVG' height="100%" width="100%" ></svg>
<script type="text/javascript">
demoSlidesvg = document.getElementById('demoSVG')
pointsMemoryPrism = []
neighbourConnectionData = {}
creationNode = {}
// From https://stackoverflow.com/questions/22521982/js-check-if-point-inside-a-polygon
function inside(point, vs) {
// ray-casting algorithm based on
// http://www.ecse.rpi.edu/Homepages/wrf/Research/Short_Notes/pnpoly.html
var x = point[0], y = point[1];
var inside = false;
for (var i = 0, j = vs.length - 1; i < vs.length; j = i++) {
var xi = vs[i][0], yi = vs[i][1];
var xj = vs[j][0], yj = vs[j][1];
var intersect = ((yi > y) != (yj > y))
&& (x < (xj - xi) * (y - yi) / (yj - yi) + xi);
if (intersect) inside = !inside;
}
return inside;
};
averagedistance = 30
radiusdeviation = 20
angledeviation = 10
function getPossibilityRange(thepoint,mainnode) {
connectedpoints = neighbourConnectionData[thepoint[0] + ',' + thepoint[1]].slice()
pointofinterest = connectedpoints[0]
Angle1 = Math.atan2(pointofinterest[1] - thepoint[1],pointofinterest[0] - thepoint[0])*180/Math.PI
if (Angle1 < 0) {
Angle1 = 360 + Angle1
}
pointofinterest = connectedpoints[1]
Angle2 = Math.atan2(pointofinterest[1] - thepoint[1],pointofinterest[0] - thepoint[0])*180/Math.PI
if (Angle2 < 0) {
Angle2 = 360 + Angle2
}
Anglemain = Math.atan2(mainnode[1] - thepoint[1],mainnode[0] - thepoint[0])*180/Math.PI
if (Anglemain < 0) {
Anglemain = 360 + Anglemain
}
maxvalue = Math.max(Angle1,Angle2)
minvalue = Math.min(Angle1,Angle2)
if (Anglemain < maxvalue && Anglemain > minvalue) {
possibilityrange = 360 - Math.abs(Angle2 - Angle1)
between = [Angle2,Angle1]
startingcue = -1
}
else {
possibilityrange = Math.abs(Angle2 - Angle1)
between = [Angle2,Angle1]
startingcue = 1
}
if(minvalue == Angle1) {
startingMneigh = connectedpoints[0]
endingMneigh = connectedpoints[1]
}
else {
startingMneigh = connectedpoints[1]
endingMneigh = connectedpoints[0]
}
return [possibilityrange,between,startingMneigh,endingMneigh,startingcue]
}
function pickAngleInRange(rangeLength,extremes,startingcuevalue) {
intervaldivision = parseInt(rangeLength/50);
minvalue = Math.min(extremes[0],extremes[1])
maxvalue = Math.max(extremes[0],extremes[1])
anglevalues = []
if (startingcuevalue == 1) {
anglevalue = minvalue
for (i=0; i < intervaldivision; i++) {
anglevalue = anglevalue + 50 + (angledeviation*(Math.random() - 0.5))
if (Math.abs(maxvalue - anglevalue) > 30) {
anglevalues.push(anglevalue)
}
}
}
else {
anglevalue = minvalue
for (i=0; i < intervaldivision; i++) {
anglevalue = anglevalue - 50 + (angledeviation*(Math.random() - 0.5))
if (anglevalue < 0) {
anglevalue = 360 + anglevalue
}
if (Math.abs(maxvalue - anglevalue) > 30) {
anglevalues.push(anglevalue)
}
}
}
return anglevalues
}
function indexOfmin(arr) {
if (arr.length === 0) {
return -1;
}
var min = arr[0];
var minIndex = 0;
for (var i = 1; i < arr.length; i++) {
if (arr[i] < min) {
minIndex = i;
min = arr[i];
}
}
return minIndex;
}
function drawText(divId, textdata, xcor, ycor,size) {
var textElement = document.createElementNS("http://www.w3.org/2000/svg", 'text');
textElement.setAttribute('x',xcor);
textElement.setAttribute('y',ycor);
textElement.setAttribute('font-size',size);
textElement.innerHTML = textdata
divId.appendChild(textElement);
}
function formPrism() {
triangleData = []
angles = pickAngleInRange(360,[0,390],1)
initvalue = [Math.random()*window.innerWidth, Math.random()*window.innerHeight];
currentvalue = initvalue
pointsList = []
pointsList.push[currentvalue]
currentlist = []
visitablenodes = []
for (j = 0; j < angles.length; j++) {
angle = angles[j]
radius = averagedistance + (radiusdeviation*Math.random())
xvalue = currentvalue[0] + radius*Math.cos(angle*Math.PI/180)
yvalue = currentvalue[1] + radius*Math.sin(angle*Math.PI/180)
if(inside([xvalue,yvalue],visitablenodes)) {
console.log("Point Outside")
}
else {
pointsList.push([xvalue,yvalue])
creationNode[xvalue+','+yvalue] = currentvalue
if (xvalue <= window.innerWidth*1.2 && xvalue >= -0.2*window.innerWidth && yvalue <= window.innerHeight*1.2 && yvalue >= -0.2*window.innerHeight) {
visitablenodes.push([xvalue,yvalue])
}
currentlist.push([xvalue,yvalue])
}
}
for (k = 0; k < currentlist.length; k++) {
neighbours = []
index = (k - 1)
if (index < 0) {
index = index + currentlist.length
}
if (index >= currentlist.length) {
index = index % currentlist.length
}
neighbours.push(currentlist[index])
index = (k + 1)
if (index < 0) {
index = index + currentlist.length
}
if (index >= currentlist.length) {
index = index % currentlist.length
}
neighbours.push(currentlist[index])
point = currentlist[k]
neighbourConnectionData[point[0] + ',' + point[1]] = neighbours
triangleData.push([neighbours[0],point,currentvalue])
}
ranges = []
for (m=0; m < visitablenodes.length;m++) {
node = visitablenodes[m]
ranges.push(getPossibilityRange(node, currentvalue)[0])
}
minvalueindex = indexOfmin(ranges)
nextnode = visitablenodes[minvalueindex]
visitablenodes.splice(minvalueindex, 1);
while(visitablenodes.length != 0) {
prange = getPossibilityRange(nextnode, creationNode[nextnode[0]+','+nextnode[1]])
mainnodevalue = currentvalue
currentvalue = nextnode
// drawDot(demoSlidesvg,currentvalue[0],currentvalue[1], '0.3%', 'blue')
// drawText(demoSlidesvg,h,currentvalue[0],currentvalue[1],14)
angles = pickAngleInRange(prange[0],prange[1],prange[4])
startingMneigh = prange[2]
endingMneigh = prange[3]
currentlist = []
for (j = 0; j < angles.length; j++) {
angle = angles[j]
radius = averagedistance + (radiusdeviation*Math.random())
xvalue = currentvalue[0] + radius*Math.cos(angle*Math.PI/180)
yvalue = currentvalue[1] + radius*Math.sin(angle*Math.PI/180)
if(inside([xvalue,yvalue],visitablenodes)) {
// console.log("Point Outside")
}
else {
pointsList.push([xvalue,yvalue])
creationNode[xvalue+','+yvalue] = currentvalue
if (xvalue <= window.innerWidth*1.2 && xvalue >= -0.2*window.innerWidth && yvalue <= window.innerHeight*1.2 && yvalue >= -0.2*window.innerHeight) {
visitablenodes.push([xvalue,yvalue])
}
currentlist.push([xvalue,yvalue])
// drawLine(demoSlidesvg,currentvalue[0],currentvalue[1],xvalue,yvalue,'red','0.4%')
// drawDot(demoSlidesvg,xvalue,yvalue, '0.3%', 'orange')
// drawText(demoSlidesvg,1,xvalue,yvalue,10)
}
}
if(currentlist.length == 0) {
currneighbours = neighbourConnectionData[currentvalue[0] + ',' + currentvalue[1]]
// drawLine(demoSlidesvg,currneighbours[0][0],currneighbours[0][1],currneighbours[1][0],currneighbours[1][1],'grey','0.2%')
n1 = currneighbours[0]
n1neighbours = neighbourConnectionData[n1[0] + ',' + n1[1]]
if (n1neighbours[0][0] == currentvalue[0] && n1neighbours[0][1] == currentvalue[1]) {
n1neighbours.splice(0, 1, currneighbours[1]);
}
else {
n1neighbours.splice(1, 1, currneighbours[1]);
}
n2 = currneighbours[1]
n2neighbours = neighbourConnectionData[n2[0] + ',' + n2[1]]
if (n2neighbours[0][0] == currentvalue[0] && n2neighbours[0][1] == currentvalue[1]) {
n2neighbours.splice(0, 1, currneighbours[0]);
}
else {
n2neighbours.splice(1, 1, currneighbours[0]);
}
triangleData.push([currneighbours[0],currneighbours[1],currentvalue])
}
else if (currentlist.length == 1) {
point = currentlist[0]
currneighbours = neighbourConnectionData[currentvalue[0] + ',' + currentvalue[1]]
neighbourConnectionData[point[0] + ',' + point[1]] = currneighbours
triangleData.push([currneighbours[0],point,currentvalue])
triangleData.push([currneighbours[1],point,currentvalue])
// drawLine(demoSlidesvg,currneighbours[0][0],currneighbours[0][1],point[0],point[1],'grey','0.2%')
// drawLine(demoSlidesvg,point[0],point[1],currneighbours[1][0],currneighbours[1][1],'grey','0.2%')
sidepoint = currneighbours[0]
ngh = neighbourConnectionData[sidepoint[0] + ',' + sidepoint[1]].slice();
if (ngh[0][0] == currentvalue[0] && ngh[0][1] == currentvalue[1]) {
ngh.splice(0, 1, point);
neighbourConnectionData[sidepoint[0] + ',' + sidepoint[1]] = ngh
}
else {
ngh.splice(1, 1, point);
neighbourConnectionData[sidepoint[0] + ',' + sidepoint[1]] = ngh
}
sidepoint = currneighbours[1]
ngh = neighbourConnectionData[sidepoint[0] + ',' + sidepoint[1]].slice();
if (ngh[0][0] == currentvalue[0] && ngh[0][1] == currentvalue[1]) {
ngh.splice(0, 1, point);
neighbourConnectionData[sidepoint[0] + ',' + sidepoint[1]] = ngh
}
else {
ngh.splice(1, 1, point);
neighbourConnectionData[sidepoint[0] + ',' + sidepoint[1]] = ngh
}
}
else {
neighbours = []
point = currentlist[0]
neighbours.push(startingMneigh)
sidepoint = startingMneigh
triangleData.push([startingMneigh,point,currentvalue])
ngh = neighbourConnectionData[sidepoint[0] + ',' + sidepoint[1]].slice();
if (ngh[0][0] == currentvalue[0] && ngh[0][1] == currentvalue[1]) {
ngh.splice(0, 1, point);
neighbourConnectionData[sidepoint[0] + ',' + sidepoint[1]] = ngh
}
else {
ngh.splice(1, 1, point);
neighbourConnectionData[sidepoint[0] + ',' + sidepoint[1]] = ngh
}
neighbours.push(currentlist[1])
neighbourConnectionData[point[0] + ',' + point[1]] = neighbours
// drawLine(demoSlidesvg,neighbours[0][0],neighbours[0][1],point[0],point[1],'grey','0.2%')
// drawLine(demoSlidesvg,point[0],point[1],neighbours[1][0],neighbours[1][1],'grey','0.2%')
for (k = 1; k < currentlist.length - 1; k++) {
neighbours = []
index = (k - 1)
if (index < 0) {
index = index + currentlist.length
}
if (index >= currentlist.length) {
index = index % currentlist.length
}
neighbours.push(currentlist[index])
index = (k + 1)
if (index < 0) {
index = index + currentlist.length
}
if (index >= currentlist.length) {
index = index % currentlist.length
}
neighbours.push(currentlist[index])
point = currentlist[k]
neighbourConnectionData[point[0] + ',' + point[1]] = neighbours
// drawLine(demoSlidesvg,neighbours[0][0],neighbours[0][1],point[0],point[1],'grey','0.2%')
// drawLine(demoSlidesvg,point[0],point[1],neighbours[1][0],neighbours[1][1],'grey','0.2%')
triangleData.push([neighbours[0],point,currentvalue])
}
triangleData.push([ currentlist[currentlist.length - 2], currentlist[currentlist.length - 1],currentvalue])
neighbours = []
point = currentlist[currentlist.length - 1]
neighbours.push(endingMneigh)
sidepoint = endingMneigh
triangleData.push([endingMneigh,point,currentvalue])
ngh = neighbourConnectionData[sidepoint[0] + ',' + sidepoint[1]].slice();
if (ngh[0][0] == currentvalue[0] && ngh[0][1] == currentvalue[1]) {
ngh.splice(0, 1, point);
neighbourConnectionData[sidepoint[0] + ',' + sidepoint[1]] = ngh
}
else {
ngh.splice(1, 1, point);
neighbourConnectionData[sidepoint[0] + ',' + sidepoint[1]] = ngh
}
neighbours.push(currentlist[currentlist.length - 2])
neighbourConnectionData[point[0] + ',' + point[1]] = neighbours
// drawLine(demoSlidesvg,neighbours[0][0],neighbours[0][1],point[0],point[1],'grey','0.2%')
// drawLine(demoSlidesvg,point[0],point[1],neighbours[1][0],neighbours[1][1],'grey','0.2%')
}
ranges = []
for (ind=0; ind < visitablenodes.length;ind++) {
node = visitablenodes[ind]
ranges.push(getPossibilityRange(node, creationNode[node[0]+','+node[1]])[0])
}
minvalueindex = indexOfmin(ranges)
prevPrange = ranges[minvalueindex]
nextnode = visitablenodes[minvalueindex]
visitablenodes.splice(minvalueindex, 1);
// drawDot(demoSlidesvg,nextnode[0],nextnode[1], '0.3%', 'violet')
}
return triangleData
}
triangleData = formPrism()
function drawPrism() {
colorchoices = ['rgba(0,0,0,0.3)']
for (i=0; i<triangleData.length; i++) {
ithTriangleSet = triangleData[i]
var polyElement = document.createElementNS("http://www.w3.org/2000/svg", 'polygon');
polypoints = ithTriangleSet[0][0] + ',' +ithTriangleSet[0][1] + ' ' + ithTriangleSet[1][0] + ',' + ithTriangleSet[1][1] + ' ' + ithTriangleSet[2][0] + ',' + ithTriangleSet[2][1]
polyElement.setAttribute('points',polypoints);
polyElement.setAttribute('id','triangleNo' + i);
polyElement.style.fill = colorchoices[parseInt(Math.random()*(colorchoices.length))];
polyElement.style.strokeWidth = '0.05%';
polyElement.style.stroke = 'rgba(255,255,255,0.3)';
demoSlidesvg.appendChild(polyElement);
}
}
drawPrism()
colorchosenStatus = {}
colorscheme = ['single','analogous','complimentary']
colorconfig = [['blue',290,240] ,['orange',70,30],['red',50,3],['violet',335,290]]
choice = colorconfig[parseInt(Math.random()*(colorconfig.length))];
scheme = colorscheme[parseInt(Math.random()*(colorscheme.length))];
function colorPick(xval,yval) {
lvalue = 10 + ((xval/window.innerWidth)*70) + (Math.random() - 0.5)*20
if (scheme == 'single') {
hvalue = choice[2]
}
else if (scheme == 'analogous') {
hvalue = choice[1] - ((yval/window.innerHeight)*100)
}
else if (scheme == 'complimentary') {
if (yval < window.innerHeight/2) {
hvalue = choice[2] + 180
}
else {
hvalue = choice[2]
}
}
else if (scheme == 'complimentary-random') {
if (Math.random() < 0.5) {
hvalue = choice[2] + 200
}
else {
hvalue = choice[2]
}
}
svalue = 100
return 'hsl(' + hvalue + ',' + svalue + '%,' + lvalue + '%)'
}
function giveColor(event) {
var bRect = demoSlidesvg.getBoundingClientRect();
posX = event.clientX - bRect.left;
posY = event.clientY - bRect.top;
colorchoice = colorPick(posX,posY)
event.target.style.fill = colorchoice
event.target.style.stroke = colorchoice
colorchosenStatus[event.target.id.toString()] = [1,colorPick(posX,posY)]
}
demoSlidesvg.addEventListener('mouseover',giveColor);
</script>
</body>
<html>