gpt4 book ai didi

javascript - d3 中的过渡碰撞检测

转载 作者:行者123 更新时间:2023-11-29 23:28:23 25 4
gpt4 key购买 nike

根据这个例子http://bl.ocks.org/ahmohamed/c1804b03b71d8a17bd37

我想在碰撞发生时改变圆和静态点的颜色,所以我为它们添加了相同的类

var points =  svg.selectAll(".point")
.data(points)
.enter().append("circle").attr('class', 'dot')
.attr("r", 20)
.attr("transform", function(d) { return "translate(" + d + ")"; });

var circle = svg.append("circle").attr('class', 'dot')
.attr("r", 10)
.attr("transform", "translate(" + points[0] + ")");

碰撞函数中我改成了这个

d3.selectAll('.dot').each(function(d,i){

代替

points.each(function(d,i){

但在那之后圆圈的颜色并没有变回正常,它一直是红色。

这是我的 JSFiddle: https://jsfiddle.net/psh2cphm/

求助!谢谢

最佳答案

一个更简单的替代方法是只保留对碰撞圆的引用:

if (!(x1 > nx2 || x2 < nx1 || y1 > ny2 || y2 < ny1)) {
collidingPoint = this;
colliding = true;
}

然后:

if (collide(this)) {
d3.select(this).style("fill", "red")
d3.select(collidingPoint).style("fill", "red")
} else {
d3.select(this).style("fill", "steelblue")
d3.select(collidingPoint).style("fill", "steelblue")
}

下面是修改后的代码:

<!DOCTYPE html>
<meta charset="utf-8">

<body>
<style>
path {
fill: none;
stroke: #000;
stroke-width: 3px;
}

circle {
fill: steelblue;
stroke: #fff;
stroke-width: 3px;
}

</style>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script>
var points = [
[480, 200],
[580, 400],
[680, 100],
[780, 300],
[180, 300],
[280, 100],
[380, 400]
];

var collidingPoint;

var svg = d3.select("body").append("svg")
.attr("width", 960)
.attr("height", 500);

var path = svg.append("path")
.data([points])
.attr("d", d3.svg.line()
.tension(0) // Catmull–Rom
.interpolate("cardinal-closed"));

var points = svg.selectAll(".point")
.data(points)
.enter().append("circle").attr('class', 'dot')
.attr("r", 20)
.attr("transform", function(d) {
return "translate(" + d + ")";
});

var circle = svg.append("circle").attr('class', 'dot')
.attr("r", 10)
.attr("transform", "translate(" + points[0] + ")");

transition();

function transition() {
circle.transition()
.duration(30000)
.tween("attr", translateAlong(path.node()))
.each("end", transition);
}

// Returns an attrTween for translating along the specified path element.
function translateAlong(path) {
var l = path.getTotalLength();
return function(d, i, a) {
return function(t) {
var p = path.getPointAtLength(t * l);

d3.select(this).attr("transform", "translate(" + p.x + "," + p.y + ")");
if (collide(this)) {
d3.select(this).style("fill", "red")
d3.select(collidingPoint).style("fill", "red")
} else {
d3.select(this).style("fill", "steelblue")
d3.select(collidingPoint).style("fill", "steelblue")
}
};
};
}

points.each(function(d, i) {
var ntrans = d3.transform(d3.select(this).attr("transform")).translate,
nx1 = ntrans[0],
nx2 = ntrans[0] + (+d3.select(this).attr("r")),
ny1 = ntrans[1],
ny2 = ntrans[1] + (+d3.select(this).attr("r"));
});

function collide(node) {
var trans = d3.transform(d3.select(node).attr("transform")).translate,
x1 = trans[0],
x2 = trans[0] + (+d3.select(node).attr("r")),
y1 = trans[1],
y2 = trans[1] + (+d3.select(node).attr("r"));

var colliding = false;
points.each(function(d, i) {
var ntrans = d3.transform(d3.select(this).attr("transform")).translate,
nx1 = ntrans[0],
nx2 = ntrans[0] + (+d3.select(this).attr("r")),
ny1 = ntrans[1],
ny2 = ntrans[1] + (+d3.select(this).attr("r"));


if (!(x1 > nx2 || x2 < nx1 || y1 > ny2 || y2 < ny1)) {
collidingPoint = this;
colliding = true;
}
})

return colliding;
}

</script>

关于javascript - d3 中的过渡碰撞检测,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/48218572/

25 4 0
Copyright 2021 - 2024 cfsdn All Rights Reserved 蜀ICP备2022000587号
广告合作:1813099741@qq.com 6ren.com