我想用一个点指针通过mousemove / touchmove旋转svg圆圈。
我尝试了很多js脚本（例如Touchy Wheel Demo和Rotate Dial Demo），他们的例子很完美，但是当我尝试我的例子时，我总是看到两个错误：
我的演示：https://jsfiddle.net/0L87uabc/8/ （请在author's demo page之前了解它是如何运作的）
此外，我尝试这个简单的例子 - 结果与上面类似：
var dragging = false
$(function() {
var circles = ['circle-l1', 'circle-l2', 'circle-l3', 'circle-l4', 'circle-l5', 'circle-l6', 'circle-l7'];
$.each(circles, function(ind, val) {
var target = $('#'+val)
target.mousedown(function() {
dragging = true
})
$(document).mouseup(function() {
dragging = false
})
target.mousemove(function(e) {
if (dragging) {
var mouse_x = e.pageX;
var mouse_y = e.pageY;
var radians = Math.atan2(mouse_x - 10, mouse_y - 10);
var degree = (radians * (180 / Math.PI) * -1) + 90;
target.css('transform', 'rotate(' + degree + 'deg)');
}
});
});
});
Domo2：https://jsfiddle.net/0L87uabc/10/
你能解释一下，为什么我的svg没有正确旋转以及如何修复它（或者你知道最好的脚本）？
答案 0 :(得分：1)
关于第二个例子：
var degree = (radians * (180 / Math.PI) * -1) + 90;
我将+ 90更改为+ 180，这允许在上半部分进行轮换。此外，从上面的行中删除(180 / Math.PI)可能有助于您获得所需的结果。
对于速度，您可以改变此行的值：
Math.atan2(mouse_x - 10, mouse_y - 10);
我将其设置为mouse_x - 100, mouse_y - 100并且速度更快。
答案 1 :(得分：1)
您需要从圆心中减去当前指针位置，以获得指针相对于中心的程度。 两个值都需要在同一个坐标系中，因此必须将指针位置转换为目标（parentNode）坐标系。
var dragging = false
$(function() {
var circles = ['circle-l1', 'circle-l2', 'circle-l3', 'circle-l4', 'circle-l5', 'circle-l6', 'circle-l7'];
$.each(circles, function(ind, val) {
var target = $('#'+val)
target.mousedown(function() {
dragging = true
})
$(document).mouseup(function() {
dragging = false
})
target.mousemove(function(e) {
if (dragging) {
var ctm=target[0].parentNode.getScreenCTM()
var p=document.getElementById("rus-front").createSVGPoint()
p.x=e.clientX
p.y=e.clientY
p=p.matrixTransform(ctm.inverse())
var mouse_x = e.pageX;
var mouse_y = e.pageY;
var radians = Math.atan2(1990 - p.x , 1900 - p.y);
var degree = (radians * (180 / Math.PI) * -1) + 90;
target.css('transform', 'rotate(' + degree + 'deg)');
}
});
});
});html, body, #circular {
width: 100%;
height: 100%;
}
#circular {
position: relative;
text-align: left;
height: 100%;
width: auto;
padding-left: 7%;
}
#circular svg {
display: inline-block;
height: 100%;
width: auto;
}
#circular [id^=circle-l] {
transform-origin: center center;
cursor: pointer;
}
#circular #circle-l1 {
transform-origin: 52% 50%;
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
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答案 2 :(得分：-2)
您可以使用SMIL规范。看看这里有什么帮助CSS Tricks。