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spline_designer.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Spline Editor</title>
<style>
body {
margin: 0;
padding: 0;
overflow: hidden;
}
rect {
fill: #eceff1;
pointer-events: all;
}
circle,
.line {
fill: none;
stroke: #2196f3;
stroke-width: 1.5px;
}
circle {
fill: white;
fill-opacity: .2;
cursor: move;
}
.selected {
fill: #ff9800;
stroke: #ff9800;
}
.grid_lines {
stroke: #90a4ae;
stroke-dasharray: 5, 15;
stroke-width: 0.5px;
}
</style>
<script src="scripts/d3.v3.min.js" charset="utf-8"></script>
<script src="scripts/jquery-3.0.0.min.js"></script>
<script type="text/javascript">
'use strict';
// From http://www.jquerybyexample.net/2012/06/get-url-parameters-using-jquery.html
function getUrlParameter(sParam) {
var sPageURL = decodeURIComponent(window.location.search.substring(1)),
sURLVariables = sPageURL.split('&'),
sParameterName,
i;
for (i = 0; i < sURLVariables.length; i++) {
sParameterName = sURLVariables[i].split('=');
if (sParameterName[0] === sParam) {
return sParameterName[1] === undefined ? true : sParameterName[1];
}
}
}
$(function () {
var window_id = getUrlParameter('id') || '';
var width = parseFloat(window.sessionStorage.getItem(window_id + ',width')) || 500,//$(window).width(),
height = parseFloat(window.sessionStorage.getItem(window_id + ',height')) || 300;//$(window).height();
var interpolation = window.sessionStorage.getItem(window_id + ',interpolation') || 'linear';
var points = window.sessionStorage.getItem(window_id + ',points');
let isPointsSet = false;
if (points) {
points = JSON.parse(points);
if (points.length) {
isPointsSet = true;
}
}
if (!isPointsSet) {
points = [[0, height], [width, 0]];
}
var dragged = null,
selected = points[0];
var line = d3.svg.line();
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height)
.attr("tabindex", 1);
svg.append("rect")
.attr("width", width)
.attr("height", height)
.on("mousedown", mousedown);
svg.append("path")
.datum(points)
.attr("class", "line")
.call(redraw);
d3.select(window)
.on("mousemove", mousemove)
.on("mouseup", mouseup)
.on("keydown", keydown);
function drawGridLines(lineCount, className) {
svg.selectAll('line.horizontal')
.data(d3.range(height/lineCount, height, height/lineCount))
.enter().append('svg:line')
.attr('x1', 0)
.attr('y1', function(d){return d;})
.attr('x2', width)
.attr('y2', function(d){return d;})
.classed(className, true);
svg.selectAll('line.vertical')
.data(d3.range(width/lineCount, width, width/lineCount))
.enter().append('svg:line')
.attr('x1', function(d){return d;})
.attr('y1', 0)
.attr('x2', function(d){return d;})
.attr('y2', height)
.classed(className, true);
}
function redraw() {
drawGridLines(4, 'grid_lines');
points.sort(function (a, b) { return a[0] - b[0]; });
line.interpolate(interpolation);
window.sessionStorage.setItem(window_id + ',points', JSON.stringify(points));
window.sessionStorage.setItem(window_id + ',interpolation', interpolation);
window.sessionStorage.setItem(window_id + ',width', width);
window.sessionStorage.setItem(window_id + ',height', height);
svg.select("path").attr("d", line);
var circle = svg.selectAll("circle")
.data(points, function(d) { return d; });
circle.enter().append("circle")
.attr("r", 1e-6)
.on("mousedown", function(d) { selected = dragged = d; redraw(); })
.transition()
.duration(750)
.ease("elastic")
.attr("r", 6.5);
circle
.classed("selected", function(d) { return d === selected; })
.attr("cx", function(d) { return d[0]; })
.attr("cy", function(d) { return d[1]; });
circle.exit().remove();
if (d3.event) {
d3.event.preventDefault();
d3.event.stopPropagation();
}
}
function mousedown() {
points.push(selected = dragged = d3.mouse(svg.node()));
redraw();
}
function mousemove() {
if (!dragged) return;
var m = d3.mouse(svg.node());
if (dragged !== points[0] && dragged !== points[points.length - 1])
dragged[0] = Math.max(0, Math.min(width, m[0]));
dragged[1] = Math.max(0, Math.min(height, m[1]));
redraw();
}
function mouseup() {
if (!dragged) return;
mousemove();
dragged = null;
}
function keydown() {
switch (d3.event.keyCode) {
case 8: // backspace
case 46: { // delete
remove_point();
break;
}
}
}
function remove_point() {
if (!selected) return;
var i = points.indexOf(selected);
if (i == 0 || i == points.length-1) return;
points.splice(i, 1);
selected = points.length ? points[i > 0 ? i - 1 : 0] : null;
redraw();
}
$(window).on('storage', function (e) {
e = e.originalEvent;
if (e.key.startsWith(window_id)) {
let specifier = e.key.split(',');
if (specifier[1] === 'interpolation') { interpolation = e.newValue; redraw(); }
else if (specifier[1] === 'remove' && e.newValue === 'true') {
window.sessionStorage.removeItem(window_id + ',remove');
remove_point();
}
}
});
$(document).mouseleave(function() {
selected = null;
redraw();
});
});
</script>
</head>
<body>
</body>
</html>