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arcExample.html
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<!DOCTYPE html>
<head>
<meta charset="utf-8">
<style>
body {
background-color: #000;
}
.labelStart, .labelEnd{
font-family: 'Ropa Sans', sans-serif;
font-size: 12px;
text-anchor: middle;
}
.arcSelection {
fill: #52BDDF;
}
.arcBackground {
fill: #808080;
}
text {
fill: #52BDDF;
}
svg {
padding-left: 100px;
}
</style>
</head>
<body>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script>
// ------------------------------------------------------------------------ Constants for SVG
var w = 200,h = w, now = new Date();
var scale = d3.scale.linear().domain([0,360]).range([0,24]);
// ------------------------------------------------------------------------ Constants for label
var fields = [{
valueStart: 24, valueEnd: 24, size: 24, labelStart: "from ", labelEnd: " to ", updateToDate: function(date) { return date.getHours(); },
changeStart: function(valueStart) { return Math.floor(scale(valueStart)); },
changeEnd: function(valueEnd) { return Math.floor(scale(valueEnd)); }
}];
// ------------------------------------------------------------------------ Constants for arcs
var strokeWidth = 2, arcSelectionAngle = 0 , arcInnerRadius = w/2, arcOuterRadius = w/2 - strokeWidth;
var fullAngle = Math.PI * 2 , maxStep = 24 * 60 , anglePerStep = fullAngle / maxStep , currentStep = 0 , animateDuration = 50;
// ------------------------------------------------------------------------ Constants for circle
var circleRadius = 4 , anglePoint = 0;
var circleStartInitCx = getInitCx((now.getHours() / fields[0].size) * 2 * Math.PI );
var circleStartInitCy = getInitCy((now.getHours() / fields[0].size) * 2 * Math.PI );
var circleEndInitCx = getInitCx(((now.getHours()+0.5)/ fields[0].size) * 2 * Math.PI );
var circleEndInitCy = getInitCy(((now.getHours()+0.5)/ fields[0].size) * 2 * Math.PI );
// create main svg
var svg = d3.select("body").append("svg")
.attr("width", w)
.attr("height", h + 10)
.attr("id", "clock");
// ------------------------------------------------------------------------ Arcs
// create arc group
var arcGroup = svg.append("g")
.attr(
"transform",
"translate(" + w / 2 + "," + h / 2 + ")"
);
var arcSelection = d3.svg.arc()
.innerRadius( arcInnerRadius )
.outerRadius( arcOuterRadius )
.startAngle( (now.getHours() / fields[0].size) * 2 * Math.PI )
.endAngle((now.getHours() / fields[0].size) * 2 * Math.PI );
var arcBackground = d3.svg.arc()
.innerRadius( arcInnerRadius )
.outerRadius( arcOuterRadius )
.startAngle( arcSelectionAngle )
.endAngle( 2 * Math.PI);
var arcBackgroundPath = arcGroup.append("path")
.attr("class", "arcBackground")
.attr("d", arcBackground);
// create arc path
var arcSelectionPath = arcGroup.append("path")
.datum({ endAngle: (now.getHours() / fields[0].size) * 2 * Math.PI })
.attr("class", "arcSelection")
.attr("d", arcSelection);
// ------------------------------------------------------------------------ Fields
// create time field
var field = svg.selectAll(".field")
.data(fields)
.enter().append("g")
.attr("transform", function() { return "translate(" + w/2 + "," + h / 2 + ")"; })
.attr("class", "field");
// create labelStart
var labelStart = field.append("text")
.attr("class", "labelStart")
.attr("dx", "-1em")
.attr("dy", ".35em")
var labelEnd = field.append("text")
.attr("class", "labelEnd")
.attr("dx", "1.4em")
.attr("dy", ".35em")
// ------------------------------------------------------------------------ Circles
// create circle
var circleStart = arcGroup.append("circle")
.attr("r", circleRadius)
.attr("fill", "#262626")
.attr("cx", circleStartInitCx)
.attr("cy", circleStartInitCy)
.attr("cursor", "move")
.call( d3.behavior.drag().on('drag', function(){
a = findAngle(d3.event.x, d3.event.y); // get drag event coordinates
currentStep = angleEndStep(a);
setAngleStep(currentStep);
moveCircleStart(a); //update circle position
movearcSelection(a); //update arcSelection angle
updateStartData(a);
}) );
var circleEnd = arcGroup.append("circle")
.attr("r", circleRadius)
.attr("fill", "#262626")
.attr("cx", circleEndInitCx)
.attr("cy", circleEndInitCy)
.attr("cursor", "move")
.call( d3.behavior.drag().on('drag', function(){
a = findAngle(d3.event.x, d3.event.y); // get drag event coordinates
currentStep = angleEndStep(a);
setAngleStep(currentStep);
moveCircleEnd(a); //update circleEnd position
moveArcEnd(a); //update arcEnd
updateEndData(a);
}) );
// ------------------------------------------------------------------------ Init
setAngleStep(currentStep);
(function updateToDate() {
var now = new Date();
field.each(function(d) { d.valueStart = d.updateToDate(now); });
field.each(function(d) { d.valueEnd = d.updateToDate(now); });
// field.each(function(d) { d.valueStart = d.updateToDate(now); });
// field.each(function(d) { d.valueEnd = d.updateToDate(now); });
labelStart.text(function(d) { return d.labelStart + d.valueStart; });
labelEnd.text(function(d) { return d.labelEnd + d.valueEnd; });
// setTimeout(updateToDate, 1000 - (now % 1000));
})();
// ------------------------------------------------------------------------Helper Functions on Drag()
function moveCircleStart(angle) {
var r = h/2 - strokeWidth;
var x = r * Math.sin(angle * Math.PI / 180);
var y = -r * Math.cos(angle * Math.PI / 180);
//only move start circle if
var directionCondition = findAngle(circleEndInitCx,circleEndInitCy) > angle && angle > 0 ;
if (directionCondition) {
circleStart
.attr("cx", x)
.attr("cy", y)
}
}
function updateStartData(angle) {
var directionCondition = findAngle(circleEndInitCx,circleEndInitCy) > angle && angle > 0 ;
if (directionCondition) {
field.each(function(d) { //update field
d.valueStart = d.changeStart(Math.floor(angle));
});
labelStart.text(function(d) { return d.labelStart + d.valueStart}); //update label
}
}
function movearcSelection(angle) {
var directionCondition = findAngle(circleEndInitCx,circleEndInitCy) > angle && angle > 0 ;
if (directionCondition) { arcSelection.startAngle(angle * Math.PI / 180) };
}
function moveCircleEnd(angle) {
var r = h/2 - strokeWidth;
var x = r * Math.sin(angle * Math.PI / 180);
var y = -r * Math.cos(angle * Math.PI / 180);
var directionCondition = findAngle(circleStartInitCx,circleStartInitCy) < angle ;
if (directionCondition) {
circleEnd
.attr("cx", x)
.attr("cy", y)
}
}
function moveArcEnd(angle) {
var directionCondition = findAngle(circleStartInitCx,circleStartInitCy) < angle ;
if (directionCondition) {arcSelection.endAngle(angle * Math.PI / 180)};
}
function updateEndData(angle) {
var directionCondition = findAngle(circleStartInitCx,circleStartInitCy) < angle ;
if (directionCondition) {
field.each(function(d) { //update field
d.valueEnd = d.changeEnd(Math.floor(angle));
});
labelEnd.text(function(d) { return d.labelEnd + d.valueEnd}); //update label
}
}
function getInitCx(angle) {
var r = h/2 - strokeWidth;
return r * Math.sin(angle);
}
function getInitCy(angle) {
var r = h/2 - strokeWidth;
return -r * Math.cos(angle);
}
// ------------------------------------------------------------------------Helper Functions
// set animate step
function setAngleStep(step) {
if (step > maxStep || step < 0)
return;
arcSelectionPath.transition()
.duration(animateDuration)
.ease("linear")
.call(
arcTween,
anglePerStep * step,
arcSelection
);
}
// animate function
function arcTween(transition, newAngle, arc) {
// arc path transition
transition.attrTween("d", function(d) {
var interpolate = d3.interpolate(d.endAngle, newAngle);
return function(t) {
d.endAngle = interpolate(t);
// translate circle
anglePoint = Math.ceil(d.endAngle / anglePerStep) / 4;
return arc(d);
};
});
}
function angleEndStep(angle) {
return angle * 4;
}
function stepEndAngle(step) {
return;
}
function findAngle(x, y) {
addAngle = x < 0 ? 270 : 90;
return (Math.atan(y/x) * 180 / Math.PI) + addAngle;
}
</script>
</body>