| 1 | <template>
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| 2 | <section>
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| 3 | <svg
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| 4 | viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg" class="z-range-bar"
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| 5 | ref="bar"
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| 6 | @click.stop="bar">
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| 7 | <circle r="52" cx="50" cy="50" :style="[styles]"></circle>
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| 8 | </svg>
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| 9 | <svg
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| 10 | xmlns="http://www.w3.org/2000/svg" class="z-range-bar-bar"
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| 11 | :style="circleStyle"
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| 12 | @touchstart="drag = true"
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| 13 | @touchmove.stop="handleBar"
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| 14 | @touchend="drag = false"
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| 15 | @mousedown="drag = true"
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| 16 | @mousemove.stop="handleBar"
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| 17 | @mouseup="drag = false">
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| 18 | <circle r="8" cx="20" cy="20" class="z-range-bar-handlebar"></circle>
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| 19 | </svg>
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| 20 | </section>
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| 21 | </template>
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| 22 |
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| 23 | <script>
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| 24 | export default {
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| 25 | name: 'z-knob',
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| 26 | props: {
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| 27 | qty: {
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| 28 | type: [Number]
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| 29 | },
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| 30 | min: {
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| 31 | type: [Number]
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| 32 | },
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| 33 | max: {
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| 34 | type: [Number]
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| 35 | },
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| 36 | pos: {
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| 37 | type: [String]
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| 38 | }
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| 39 | },
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| 40 | data () {
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| 41 | return {
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| 42 | componentType: this.$options.name,
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| 43 | drag: false,
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| 44 | angle: 0,
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| 45 | prevAngle: 0
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| 46 | }
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| 47 | },
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| 48 | computed: {
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| 49 | position () {
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| 50 | const diameter = this.$zircle.getComponentWidth(this.$parent.size) / 2
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| 51 | return {
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| 52 | X: (diameter - 3) * Math.cos(this.angle * (Math.PI / 180)),
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| 53 | Y: (diameter - 3) * Math.sin(this.angle * (Math.PI / 180)),
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| 54 | arc: (Math.PI * 100) * ((this.angle - 360) / 360)
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| 55 | }
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| 56 | },
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| 57 | styles () {
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| 58 | const circleLength = 2 * Math.PI * 50
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| 59 | return {
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| 60 | transformOrigin: '50% 50%',
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| 61 | transform: 'rotate(0deg)',
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| 62 | strokeDasharray: circleLength,
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| 63 | strokeDashoffset: -this.position.arc,
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| 64 | strokeWidth: 11
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| 65 | }
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| 66 | },
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| 67 | circleStyle () {
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| 68 | return {
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| 69 | transformOrigin: '50% 50%',
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| 70 | transform: 'translate3d(' + this.position.X + 'px, ' + this.position.Y + 'px, 0px)'
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| 71 | }
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| 72 | }
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| 73 | },
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| 74 | methods: {
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| 75 | bar (e) {
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| 76 | e = e.changedTouches ? e.changedTouches[0] : e
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| 77 | const dimensions = this.$refs.bar.getBoundingClientRect()
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| 78 | const centerx = (dimensions.width / 2) + dimensions.left
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| 79 | const centery = (dimensions.height / 2) + dimensions.top
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| 80 | const posx = e.pageX
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| 81 | const posy = e.pageY
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| 82 | const deltay = centery - posy
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| 83 | const deltax = centerx - posx
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| 84 | let tangle = Math.atan2(deltay, deltax) * (180 / Math.PI)
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| 85 | tangle -= 180
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| 86 | tangle = Math.round(tangle)
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| 87 | if (tangle < 0) tangle = 360 + tangle
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| 88 | let prevAngle = Math.round(this.angle)
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| 89 | const id = setInterval(() => {
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| 90 | if (prevAngle > tangle) {
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| 91 | prevAngle--
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| 92 | } else if (prevAngle < tangle) {
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| 93 | prevAngle++
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| 94 | } else {
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| 95 | clearInterval(id)
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| 96 | }
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| 97 | this.angle = prevAngle
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| 98 | this.$emit('update:qty', Math.round((prevAngle / 360) * (this.max - this.min)) + this.min)
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| 99 | }, 0)
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| 100 | },
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| 101 | handleBar (e) {
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| 102 | if (this.drag === true) {
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| 103 | e = e.changedTouches ? e.changedTouches[0] : e
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| 104 | const dimensions = this.$refs.bar.getBoundingClientRect()
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| 105 | const centerx = (dimensions.width / 2) + dimensions.left
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| 106 | const centery = (dimensions.height / 2) + dimensions.top
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| 107 | const posx = e.pageX
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| 108 | const posy = e.pageY
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| 109 | const deltay = centery - posy
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| 110 | const deltax = centerx - posx
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| 111 | let tangle = Math.atan2(deltay, deltax) * (180 / Math.PI)
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| 112 | tangle -= 180
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| 113 | tangle = Math.round(tangle)
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| 114 | if (tangle < 0) tangle = 360 + tangle
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| 115 | this.angle = tangle
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| 116 | this.$emit('update:qty', Math.round((tangle / 360) * (this.max - this.min)) + this.min)
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| 117 | }
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| 118 | }
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| 119 | },
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| 120 | mounted () {
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| 121 | this.angle = Math.round(((this.qty - this.min) * 360) / (this.max - this.min))
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| 122 | }
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| 123 | }
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| 124 | </script>
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