最近公司有一个项目的需要做出旋钮的效果,旋钮有十个档,根据手指旋转切换,旋转时接近最近的档会有吸附效果,具体效果如下:
html部分代码:
<div class="_touch"> <div class="round_box" ref="box" @touchstart="touchStart" @touchmove="touchMove"> <div v-if="able" > <div class="round_right" ref="right" :> <div class="round_info"></div> </div> <div class="round_num">{{level}}</div> </div> </div> </div>
less样式部分代码:
._touch { padding-top: 48px; .round_box { position: relative; width: 54%; padding-top: 54%; margin: 0 auto; background-image: url(../../assets/img/round_box.png); background-size: auto 100%; background-position: center top; background-repeat: no-repeat; .round_right { width: 8%; height: 27%; position: absolute; left: 46%; top: 23%; transform-origin: 50% 100%; -webkit-transform-origin: 50% 100%; z-index: 2; .round_info { background: linear-gradient(#858585, #b3b3b3); background: -webkit-gradient(#858585, #b3b3b3); background: -moz-linear-gradient(#858585, #b3b3b3); width: 100%; padding-top: 100%; border-radius: 100%; } } .round_num { display: inline-block; position: absolute; z-index: 1; text-align: center; width: 30%; top: 38%; left: 35%; font-size: 2.4em; font-weight: 900; background: linear-gradient(#b0b0b0, #c8c8c8); background: -webkit-gradient(#b0b0b0, #c8c8c8); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; text-fill-color: transparent; } } }
js部分代码:
methods: { ......, touchStart(e) { e.preventDefault(); e.stopPropagation(); let round_box = this.$refs.box; var w = round_box.offsetWidth / 2; var h = round_box.offsetHeight / 2; this.px = round_box.getBoundingClientRect().left + w; this.py = round_box.getBoundingClientRect().top + h; }, touchMove(e) { e.preventDefault(); e.stopPropagation(); this.getAngle(e.changedTouches[0].clientX, e.changedTouches[0].clientY); }, touchEnd(e) { e.preventDefault(); e.stopPropagation(); }, resetAngle(angle) { let list = [ { angle: 0, level: 5 }, { angle: 36, level: 6 }, { angle: 72, level: 7 }, { angle: 108, level: 8 }, { angle: 144, level: 9 }, { angle: 180, level: 10 }, { angle: 216, level: 1 }, { angle: 252, level: 2 }, { angle: 288, level: 3 }, { angle: 324, level: 4 }, { angle: 360, level: 5 } ]; let result = list.filter(function(currentVal, index, arr) { return Math.abs(angle - currentVal.angle) <= 18; }); this.angle = result[0].angle; this.level = result[0].level; }, getAngle(mx, my) { var px = this.px; var py = this.py; var x = Math.abs(px - mx); var y = Math.abs(py - my); var z = Math.sqrt(Math.pow(x, 2) + Math.pow(y, 2)); var cos = y / z; var radina = Math.acos(cos); //用反三角函数求弧度 var angle = Math.floor(180 / (Math.PI / radina)); //将弧度转换成角度 if (mx > px && my > py) { //鼠标在第四象限 angle = 180 - angle; } if (mx == px && my > py) { //鼠标在y轴负方向上 angle = 180; } if (mx > px && my == py) { //鼠标在x轴正方向上 angle = 90; } if (mx < px && my > py) { //鼠标在第三象限 angle = 180 + angle; } if (mx < px && my == py) { //鼠标在x轴负方向 angle = 270; } if (mx < px && my < py) { //鼠标在第二象限 angle = 360 - angle; } this.angle = angle; this.$nextTick(function() { this.resetAngle(this.angle); }); }, ......
主要的思路是根据监听 .round_box 元素的 touchmove 事件获取手指相对于圆心这条直线的旋转角度(transform : rotate),
并把旋转角度同步到水平居中于 .round_box 容器,底边框中心与 .round_box重合的元素 : .round_right 上,使它相对于
.round_box的圆心旋转即可。
注:.round_box圆心如下:
注:.round_right 元素如下:
总结
以上所述是小编给大家介绍的基于vue实现移动端圆形旋钮插件效果,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对亿速云网站的支持!
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