我创建了一个圆形SVG滑块但是我仍然在正确定位点时遇到问题。 看看Codepen上的当前结果:
HTML:
<svg version="1.1" id="slider" width="300px" height="150px">
<path id="sliderPath" stroke="red" stroke-width="5" d="M10,100a147,147,0,1,1,280,1"/>
<circle id="dot" fill="white" cx="10" cy="100" r="14" />
</svg>
JS:
var sliderPath = document.getElementById("sliderPath"),
box = sliderPath.getBBox(),
dot = document.getElementById("dot"),
W = box.width,
pathLength = sliderPath.getTotalLength();
Draggable.create(
document.createElement('div'),
{
type:'x',
throwProps:true,
bounds: { minX:0, maxX:W },
trigger:dot,
overshootTolerance:0,
onDrag:update,
onThrowUpdate:update
});
function update(){
// Get x and y for dot.
var P = sliderPath.getPointAtLength(this.x / W * pathLength);
// Set dot.
TweenLite.set(dot,{attr:{cx:P.x,cy:P.y}});
};
http://codepen.io/Yheeky/pen/xEbAbR
您可以开始拖动点并从左向右移动鼠标。这很有效,但是我需要更直接地设置点位置,使得点位置等于鼠标位置,但仅沿着路径。 为了得到这样的结果,我需要改变什么?
提前致谢!
答案 0 :(得分:0)
下面的示例显示了水平条路径。条形的路径长度和sliderPath比率的路径长度用于沿着sliderPath移动点。
这个例子有点时髦,因为我移动了svg所以它完全可见,但你应该知道它是如何工作的。
<!DOCTYPE HTML>
<html>
<head>
<title>Slider@Semi Circle</title>
</head>
<body>
<div style='position:absolute;top:200px;left:200px;'>
<svg overflow=visible version="1.1" id="slider" width="300px" height="150px">
<path onmousedown=moveDotStart(evt) onmousemove=moveDot(evt) onmouseup=moveDotEnd(evt) onmouseout=moveDotEnd(evt) id="slideBar" stroke=lime opacity=.3 stroke-width=30 d="M10,100 L290,100" />
<path id="sliderPath" stroke="red" fill="none" stroke-width="5" d="M10,100a147,147,0,1,1,280,1"/>
<circle pointer-events="none" id="dot" fill="blue" cx="10" cy="100" r="14" />
</svg>
</div>
<script>
var MoveDot=false
function moveDotStart(evt)
{
MoveDot=true
}
function moveDot(evt)
{
if(MoveDot==true)
{
var pathLength=sliderPath.getTotalLength()
var barLength=slideBar.getTotalLength()
var xCursor=evt.clientX-10-200
var moveRatio=xCursor/barLength
var dotPathLength=moveRatio*pathLength
var dotPnt=sliderPath.getPointAtLength(dotPathLength)
dot.setAttribute("cx",dotPnt.x)
dot.setAttribute("cy",dotPnt.y)
}
}
function moveDotEnd(evt)
{
MoveDot=false
}
</script>
</body>
</html>
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