Using D3 To Animate A Virtual Wheel, How To Make It Spin Realistically?
The rotation is tweened using the following function. How can I make this spin look more real? How can I control the speed making it start fast and then slow down instead of speed
Solution 1:
You just need to set the adequate easing. For instance, using D3 v3 (your case), you can do:
.ease("cubic-out")
Here is your code with that change:
var w = Math.max(document.documentElement.clientWidth, window.innerWidth || 0);
var h = Math.max(document.documentElement.clientHeight, window.innerHeight || 0);
var fs = 33;
if (w > h) {
w = w / 1.5;
} else {
h = h / 1.5;
}
if (w > h) {
fs = h / 25;
} else {
fs = w / 25;
}
var padding = {
top: 20,
right: 40,
bottom: 0,
left: 0
},
w = w - padding.left - padding.right,
h = h - padding.top - padding.bottom,
r = Math.min(w, h) / 2,
rotation = 0,
oldrotation = 0,
picked = 100000,
oldpick = [],
color = d3.scale.category20(); //category20c()var data = [{
"label": "100",
"value": 1,
"question": "What CSS property is used for specifying the area between the content and its border?"
}, // padding
{
"label": "200",
"value": 1,
"question": "What CSS property is used for changing the font?"
}, //font-family
{
"label": "300",
"value": 1,
"question": "What CSS property is used for changing the color of text?"
}, //color
{
"label": "400",
"value": 1,
"question": "What CSS property is used for changing the boldness of text?"
}, //font-weight
{
"label": "500",
"value": 1,
"question": "What CSS property is used for changing the size of text?"
}, //font-size
{
"label": "600",
"value": 1,
"question": "What CSS property is used for changing the background color of a box?"
}, //background-color
{
"label": "700",
"value": 1,
"question": "Which word is used for specifying an HTML tag that is inside another tag?"
}, //nesting
{
"label": "GRAND",
"value": 1,
"question": "Which side of the box is the third number in: margin:1px 1px 1px 1px; ?"
}, //bottom
{
"label": "",
"value": 1,
"question": "What are the fonts that don't have serifs at the ends of letters called?"
}, //sans-serif
{
"label": "100",
"value": 1,
"question": "With CSS selectors, what character prefix should one use to specify a class?"
}, //period
{
"label": "200",
"value": 1,
"question": "With CSS selectors, what character prefix should one use to specify an ID?"
}, //pound sign
{
"label": "300",
"value": 1,
"question": "In an HTML document, which tag holds all of the content people see?"
}, //<body>
{
"label": "400",
"value": 1,
"question": "In an HTML document, which tag indicates an unordered list?"
}, //<ul>
{
"label": "500",
"value": 1,
"question": "In an HTML document, which tag indicates the most important heading of your document?"
}, //<h1>
{
"label": "600",
"value": 1,
"question": "What CSS property is used for specifying the area outside a box?"
}, //margin
{
"label": "700",
"value": 1,
"question": "What type of bracket is used for HTML tags?"
}, //< >
{
"label": "",
"value": 1,
"question": "What type of bracket is used for CSS rules?"
}, // { }
{
"label": "100",
"value": 1,
"question": "Which HTML tag is used for specifying a paragraph?"
}, //<p>
{
"label": "200",
"value": 1,
"question": "What should always be the very first line of code in your HTML?"
}, //<!DOCTYPE html>
{
"label": "300",
"value": 1,
"question": "What HTML tag holds all of the metadata tags for your page?"
}, //<head>
{
"label": "400",
"value": 1,
"question": "In CSS, what character separates a property from a value?"
}, // colon
{
"label": "500",
"value": 1,
"question": "What HTML tag holds all of your CSS code?"
}, // <style>
{
"label": "600",
"value": 1,
"question": "What file extension should you use for your web pages?"
}, // .html
{
"label": "700",
"value": 1,
"question": "Which coding language is used for marking up content and structure on a web page?"
}, // HTML
{
"label": "",
"value": 1,
"question": "Which coding language is used for specifying the design of a web page?"
}, // CSS// {"label":"SAMSUNG NOTE5", "value":1, "question":"Which coding language is used for adding functionality to a web page?"}, // JavaScript// {"label":"HP DESKTOP", "value":1, "question":"What CSS property is used for making the edges of a box visible?"}, // border// {"label":"15,000,000$", "value":1, "question":"What character symbol is used at the end of each CSS statement?"},//semi-colon// {"label":"BUGGATI", "value":1, "question":"By default, how wide is a <div> box?"}, //100%// {"label":" GOOGLE JOB", "value":1, "question":"What character symbol do I use to specify multiple CSS selectors in one code block?"} //comma
];
var svg = d3.select('#chart')
.append("svg")
.data([data])
//.style("display", "flex")
.attr("width", w + padding.left + padding.right)
.attr("height", h + padding.top + padding.bottom);
var container = svg.append("g")
.attr("class", "chartholder")
.attr("transform", "translate(" + (w / 2 + padding.left) + "," + (h / 2 + padding.top) + ")");
var vis = container
.append("g");
var pie = d3.layout.pie().sort(null).value(function(d) {
return1;
});
// declare an arc generator functionvar arc = d3.svg.arc().outerRadius(r);
// select paths, use arc generator to drawvar arcs = vis.selectAll("g.slice")
.data(pie)
.enter()
.append("g")
.attr("class", "slice");
arcs.append("path")
.attr("fill", function(d, i) {
returncolor(i);
})
.attr("d", function(d) {
returnarc(d);
});
// add the text
arcs.append("text")
.attr("transform", function(d) {
d.innerRadius = 0;
d.outerRadius = r;
d.angle = (d.startAngle + d.endAngle) / 2;
return"rotate(" + (d.angle * 180 / Math.PI - 90) + ")translate(" + (d.outerRadius - 10) + ")";
})
.attr("text-anchor", "end")
.style("font-size", fs)
.selectAll(null)
.data((_, i) => data[i].label)
.enter()
.append("tspan")
.attr("rotate", "90")
.attr("dx", (_, i) => i ? "-1.5em" : null)
.attr("y", 0)
.text(function(d) {
return d
});
container.on("click", spin);
functionspin(d) {
container.on("click", null);
//all slices have been seen, all doneif (oldpick.length == data.length) {
console.log("done");
container.on("click", null);
return;
}
var ps = 360 / data.length,
pieslice = Math.round(1440 / data.length),
rng = Math.floor((Math.random() * 1440) + 360);
rotation = (Math.round(rng / ps) * ps);
picked = Math.round(data.length - (rotation % 360) / ps);
picked = picked >= data.length ? (picked % data.length) : picked;
if (oldpick.indexOf(picked) !== -1) {
d3.select(this).call(spin);
return;
} else {
oldpick.push(picked);
}
rotation += 90 - Math.round(ps / 2);
vis.transition()
.duration(3000)
.attrTween("transform", rotTween)
.ease("cubic-out")
.each("end", function() {
//mark question as seen
d3.select(".slice:nth-child(" + (picked + 1) + ") path")
.attr("fill", "#111");
//populate question
d3.select("#question h1")
.text(data[picked].question);
oldrotation = rotation;
container.on("click", spin);
});
}
//make arrow
svg.append("g")
.attr("transform", "translate(" + (w + padding.left + padding.right) + "," + ((h / 2) + padding.top) + ")")
.append("path")
.attr("d", "M-" + (r * .15) + ",0L0," + (r * .05) + "L0,-" + (r * .05) + "Z")
.style({
"fill": "black"
});
//draw spin circle
container.append("circle")
.attr("cx", 0)
.attr("cy", 0)
.attr("r", 60)
.style({
"fill": "white",
"cursor": "pointer"
});
//spin text
container.append("text")
.attr("x", 0)
.attr("y", 15)
.attr("text-anchor", "middle")
.text("SPIN")
.style({
"font-weight": "bold",
"font-size": "30px"
});
functionrotTween(to) {
var i = d3.interpolate(oldrotation % 360, rotation);
returnfunction(t) {
return"rotate(" + i(t) + ")";
};
}text {
font-family: Helvetica, Arial, sans-serif;
font-size: 11px;
pointer-events: none;
}
#chart {
position: absolute;
width: 100vw;
height: 100vh;
top: 0;
left: 0;
text-align: center;
display: -webkit-flex;
/* Safari */display: flex;
-webkit-align-items: center;
/* Safari 7.0+ */align-items: center;
-webkit-justify-content: center;
justify-content: center;
}
#question {
position: absolute;
width: 100vw;
height: 100vh;
top: 0;
left: 0;
pointer-events: none;
}
#questionh1 {
font-size: 50px;
font-weight: bold;
font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
position: absolute;
padding: 0;
margin: 0;
top: 50%;
-webkit-transform: translate(0, -50%);
transform: translate(0, -50%);
}<!DOCTYPE html><html><head><metacharset="utf-8"><title>Wheel of Fortune Bingo</title></head><body><divid="chart"></div><divid="question"><h1></h1></div><scriptsrc="https://d3js.org/d3.v3.min.js"charset="utf-8"></script></body></html>
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