[ Launch: phat path draw ] 8174c35c5d5ad2b83e5d by enjalot
[ Launch: perpendicular tangent on path ] 137845deaa0ff77abaeb by enjalot
[ Launch: tangent ] ce4c4409fb80559de2bd by enjalot
[ Launch: sampling ] 811484fa83dab4291a2a by enjalot
[ Launch: sampling ] ae8f1e9e966533a0e2e2 by enjalot
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phat path draw
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{"description":"phat path draw","endpoint":"","display":"svg","public":true,"require":[],"fileconfigs":{"inlet.js":{"default":true,"vim":false,"emacs":false,"fontSize":12},"_.md":{"default":true,"vim":false,"emacs":false,"fontSize":12},"config.json":{"default":true,"vim":false,"emacs":false,"fontSize":12},"style.css":{"default":true,"vim":false,"emacs":false,"fontSize":12},"points.json":{"default":true,"vim":false,"emacs":false,"fontSize":12}},"fullscreen":false,"play":false,"loop":false,"restart":false,"autoinit":true,"pause":true,"loop_type":"pingpong","bv":false,"nclones":15,"clone_opacity":0.4,"duration":3000,"ease":"linear","dt":0.01,"ajax-caching":true,"thumbnail":"http://i.imgur.com/d9s5GuB.png","inline-console":false,"controls":{"Amplitude Top":100,"tang":100,"tangent":52,"tangent at":50,"tangent at ":50,"tangent at percent":59}} |
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var height = 150; | |
var cm = tributary.getCodeEditor("points.json"); | |
var points = JSON.parse(cm.getValue()) | |
// lets use percentage of the length to determine where we take tangent; | |
var tangentAt = 38; | |
// the amount to phatten the path by | |
var vectorScale = 20; | |
// the number of samples | |
var numSamples = 156 | |
var pathWidth = 13; | |
var sampleWidth = 10; | |
var circleRadius = 18; | |
var line = d3.svg.line() | |
.x(function(d) { return d.x }) | |
.y(function(d) { return d.y }) | |
.interpolate("cardinal") | |
//.interpolate("basis") | |
var svg = d3.select("svg") | |
var path = svg.append("path") | |
.style({ | |
fill: "none", | |
stroke: "#000", | |
"stroke-width": pathWidth | |
}) | |
var drag = d3.behavior.drag() | |
.on("drag", function(d) { | |
d.x = d3.mouse(this)[0]; | |
d.y = d3.mouse(this)[1]; | |
draw() | |
}) | |
.on("dragend", function() { | |
save(); | |
}) | |
svg.on("dblclick", function() { | |
points.push({x: d3.mouse(this)[0], y: d3.mouse(this)[1] }); | |
draw(); | |
save(); | |
}) | |
function draw() { | |
path.attr("d", line(points)); | |
var pathNode = path.node(); | |
var tangent = getTangent(pathNode, tangentAt); | |
tangent.v.x *= vectorScale | |
tangent.v.y *= vectorScale | |
var perp = rotate2d(tangent.v, 90); | |
var node = path.node() | |
var samples = getSamples(node, numSamples); | |
var slines = svg.selectAll("line.perp") | |
.data(samples); | |
slines.exit().remove(); | |
slines.enter() | |
.append("line").classed("perp", true) | |
slines | |
.attr({ | |
x1: function(d) { return d.point.x - d.perp.x }, | |
y1: function(d) { return d.point.y - d.perp.y }, | |
x2: function(d) { return d.point.x + d.perp.x }, | |
y2: function(d) { return d.point.y + d.perp.y }, | |
stroke: "#5f55e1", | |
"stroke-width": sampleWidth, | |
"stroke-opacity": 0.5, | |
"stroke-linecap": "round" | |
}) | |
var circles = svg.selectAll("circle") | |
.data(points); | |
circles.exit().remove(); | |
circles | |
.enter().append("circle") | |
circles | |
.attr({ | |
cx: function(d) { return d.x }, | |
cy: function(d) { return d.y }, | |
r: circleRadius, | |
fill: "#de9090", | |
"fill-opacity": 0.5, | |
stroke: "#6d6d6d" | |
}).call(drag) | |
.on("dblclick", function(d) { | |
var index = points.indexOf(d); | |
console.log(index); | |
points.splice(index, 1); | |
d3.event.stopPropagation(); | |
save(); | |
draw(); | |
}) | |
} | |
function save() { | |
setTimeout(function() { | |
var newpoints = []; | |
points.forEach(function(d) { newpoints.push(d) }); | |
cm.setValue(JSON.stringify(newpoints)); | |
}, 10) | |
} | |
draw(); | |
function getSamples(path, num) { | |
var len = path.getTotalLength() | |
var p, t; | |
var result = [] | |
for(var i = 0; i < num; i++) { | |
p = path.getPointAtLength(i * len/num); | |
t = getTangent(path, i/num * 100); | |
t.v.x *= vectorScale | |
t.v.y *= vectorScale | |
result.push({ | |
point: p, | |
tangent: t, | |
perp: rotate2d(t.v, 90) | |
}); | |
} | |
return result | |
} | |
function getTangent(path, percent) { | |
// returns a normalized vector that describes the tangent | |
// at the point that is found at *percent* of the path's length | |
var fraction = percent/100; | |
if(fraction < 0) fraction = 0; | |
if(fraction > 0.99) fraction = 1; | |
var len = path.getTotalLength(); | |
var point1 = path.getPointAtLength(fraction * len - 0.1); | |
var point2 = path.getPointAtLength(fraction * len + 0.1); | |
var vector = { x: point2.x - point1.x, y: point2.y - point1.y } | |
var magnitude = Math.sqrt(vector.x*vector.x + vector.y*vector.y); | |
vector.x /= magnitude; | |
vector.y /= magnitude; | |
return {p: point1, v: vector }; | |
} | |
function rotate2d(vector, angle) { | |
//rotate a vector | |
angle *= Math.PI/180; //convert to radians | |
return { | |
x: vector.x * Math.cos(angle) - vector.y * Math.sin(angle), | |
y: vector.x * Math.sin(angle) + vector.y * Math.cos(angle) | |
} | |
} | |
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[{"x":48,"y":284},{"x":130,"y":182},{"x":242,"y":360},{"x":50,"y":338},{"x":50,"y":469},{"x":328,"y":423},{"x":270,"y":213},{"x":480,"y":267},{"x":413,"y":429},{"x":634,"y":446},{"x":510,"y":170},{"x":670,"y":243}] |
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#display { | |
background: white | |
} |
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