本文介绍了通过mousemove/touchmove错误进行SVG角度旋转的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我想用一个食指通过mousemove/touchmove旋转svg圆.
I want to rotate svg circulars by mousemove/touchmove with one point finger.
我尝试了许多js脚本(例如， Touchy Wheel演示和旋转拨号演示)及其示例很完美，但是当我尝试示例时，总是会看到两个错误:
I tried many js scripts (for ex. Touchy Wheel Demo and Rotate Dial Demo) and their examples works perfect, but when I try my example I always see two bugs:
- 旋转仅在圆形的下部起作用，在顶部-反向旋转.
- 旋转非常缓慢(在演示轮中，鼠标/手指强烈跟随旋转).
我的演示: https://jsfiddle.net/0L87uabc/8/ (请先在作者的演示页面上查看它)
我也尝试这个简单的示例-result与上面类似:
Also i try this simple example -result is similar to above:
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/
您能解释一下，为什么我的svg无法正确旋转以及如何解决(或者您知道最好的脚本)吗?
Can you explain, why my svg doesn't rotate correctly and how to fix it (or you know best script for this)?
推荐答案
您需要从圆心减去当前指针的位置，以获取指针相对于中心的角度.两个值都必须在同一坐标系中，因此您必须将指针位置转换为目标(parentNode)坐标系.
you need to substract your current pointer position from the center of the circle to get the degree of the pointer relative to the center.both values need to be in the same coordinate system, so you have to transform your pointer position to the targets (parentNode) coordinate system.
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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width="4050px" height="3940px" viewBox="0 0 4050 3940" enable-background="new 0 0 4050 3940" xml:space="preserve">
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