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spline.html
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<!DOCTYPE html>
<meta charset="utf-8">
<title>Spline Editor</title>
<!-- http://bl.ocks.org/mbostock/4342190 -->
<style>
body {
font: 13px sans-serif;
position: relative;
width: 960px;
height: 500px;
}
form {
position: absolute;
bottom: 10px;
left: 10px;
}
rect {
fill: none;
pointer-events: all;
}
circle,
.line {
fill: none;
stroke: steelblue;
stroke-width: 1.5px;
}
circle {
fill: #fff;
fill-opacity: 0.2;
cursor: move;
}
.selected {
fill: #ff7f0e;
stroke: #ff7f0e;
}
</style>
<form>
<label for="interpolate">Interpolate:</label>
<select id="interpolate"></select><br>
</form>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
<script>
var width = 960,
height = 500;
var points = [];
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("keypress", keypress);
d3.select("#interpolate")
.on("change", change)
.selectAll("option")
.data(["linear", "step-before", "step-after", "basis", "basis-open", "basis-closed", "cardinal", "cardinal-open", "cardinal-closed", "monotone"])
.enter()
.append("option")
.attr("value", function(d) {
return d;
})
.text(function(d) {
return d;
});
svg.node()
.focus();
function redraw() {
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 change() {
line.interpolate(this.value);
redraw();
}
function mousedown() {
if (points.length > 2) {
<!-- points.pop(); -->
}
points.push(selected = dragged = d3.mouse(svg.node()));
redraw();
}
function mousemove() {
if (!dragged)
return;
var m = d3.mouse(svg.node());
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 keypress() {
console.log(d3.event.keyCode);
if (!selected)
return;
switch (d3.event.keyCode) {
case 16 :
console.log("shifted")
break;
case 8 : // backspace
case 46 :
{ // delete
var i = points.indexOf(selected);
points.splice(i, 1);
selected = points.length
? points[i > 0
? i - 1
: 0]: null;
redraw();
break;
}
}
}
</script>