mirror of https://github.com/lissy93/dashy
📦 Built an SVG gauge chart component
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Alicia Sykes
parent
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commit
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<template>
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<div class="gauge">
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<svg
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v-if="height"
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:viewBox="`0 0 ${RADIUS * 2} ${height}`" height="100%" width="100%"
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xmlns="http://www.w3.org/2000/svg"
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>
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<defs>
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<!-- Inner shadow for empty part of the gauge -->
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<filter :id="`innershadow-${_uid}`">
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<feFlood flood-color="#c7c6c6" />
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<feComposite in2="SourceAlpha" operator="out" />
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<feGaussianBlur stdDeviation="2" result="blur" />
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<feComposite operator="atop" in2="SourceGraphic" />
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</filter>
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<!-- Gradient color for the full part of the gauge -->
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<linearGradient
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v-if="hasGradient"
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:id="`gaugeGradient-${_uid}`"
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>
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<stop
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v-for="(color, index) in gaugeColor"
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:key="`${color.color}-${index}`"
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:offset="`${color.offset}%`" :stop-color="color.color"
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/>
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</linearGradient>
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<mask :id="`innerCircle-${_uid}`">
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<!-- Mask to make sure only the part inside the circle is visible -->
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<!-- RADIUS - 0.5 to avoid any weird display -->
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<circle :r="RADIUS - 0.5" :cx="X_CENTER" :cy="Y_CENTER" fill="white" />
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<!-- Mask to remove the inside of the gauge -->
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<circle :r="innerRadius" :cx="X_CENTER" :cy="Y_CENTER" fill="black" />
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<template v-if="separatorPaths">
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<!-- Mask for each separator -->
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<path
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v-for="(separator, index) in separatorPaths"
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:key="index"
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:d="separator" fill="black"
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/>
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</template>
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</mask>
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</defs>
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<g :mask="`url(#innerCircle-${_uid})`">
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<!-- Draw a circle if the full gauge has a 360° angle, otherwise draw a path -->
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<circle
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v-if="isCircle"
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:r="RADIUS" :cx="X_CENTER" :cy="Y_CENTER"
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:fill="hasGradient ? `url(#gaugeGradient-${_uid})` : gaugeColor"
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/>
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<path
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v-else
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:d="basePath" :fill="hasGradient ? `url(#gaugeGradient-${_uid})` : gaugeColor"
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/>
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<!-- Draw a circle if the empty gauge has a 360° angle, otherwise draw a path -->
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<circle
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v-if="value === min && isCircle"
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:r="RADIUS" :cx="X_CENTER" :cy="Y_CENTER"
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:fill="baseColor"
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/>
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<path v-else :d="gaugePath" :fill="baseColor" :filter="`url(#innershadow-${_uid})`" />
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</g>
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<template v-if="scaleLines">
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<!-- Display a line for each tick of the scale -->
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<line
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v-for="(line, index) in scaleLines"
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:key="`${line.xE}-${index}`"
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:x1="line.xS" :y1="line.yS" :x2="line.xE" :y2="line.yE"
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stroke-width="1" :stroke="baseColor"
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/>
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</template>
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<!-- Option for displaying content inside the gauge -->
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<foreignObject x="0" y="0" width="100%" :height="height">
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<slot />
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</foreignObject>
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</svg>
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</div>
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</template>
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<script>
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/** A gauge chart component for showing percentages
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* Heavily inspired by vue-svg-gauge by @hellocomet
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* See: https://github.com/hellocomet/vue-svg-gauge
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*/
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import ErrorHandler from '@/utils/ErrorHandler';
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// Main radius of the gauge
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const RADIUS = 100;
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// Coordinates of the center based on the radius
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const X_CENTER = 100;
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const Y_CENTER = 100;
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/* Turn polar coordinate to cartesians */
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function polarToCartesian(radius, angle) {
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const angleInRadians = (angle - 90) * (Math.PI / 180);
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return {
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x: X_CENTER + (radius * Math.cos(angleInRadians)),
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y: Y_CENTER + (radius * Math.sin(angleInRadians)),
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};
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}
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/* Describe a gauge path according */
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function describePath(radius, startAngle, endAngle) {
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const start = polarToCartesian(radius, endAngle);
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const end = polarToCartesian(radius, startAngle);
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const largeArcFlag = endAngle - startAngle <= 180 ? '0' : '1';
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const d = [
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'M', start.x, start.y,
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'A', radius, radius, 0, largeArcFlag, 0, end.x, end.y,
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'L', X_CENTER, Y_CENTER,
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].join(' ');
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return d;
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}
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export default {
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name: 'Gauge',
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props: {
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value: {
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type: Number,
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default: 70,
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},
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min: {
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type: Number,
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default: 0,
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},
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max: {
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type: Number,
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default: 100,
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},
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startAngle: {
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type: Number,
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default: -90,
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validator: (value) => {
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if (value < -360 || value > 360) {
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ErrorHandler('Gauge Chart - Expected prop "startAngle" to be between -360 and 360');
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}
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return true;
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},
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},
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endAngle: {
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type: Number,
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default: 90,
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validator: (value) => {
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if (value < -360 || value > 360) {
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ErrorHandler('Gauge Chart - Expected prop "endAngle" to be between -360 and 360');
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}
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return true;
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},
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},
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/* Size of the inner radius between 0 and RADIUS. Closer to RADIUS, is thinner gauge */
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innerRadius: {
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type: Number,
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default: 60,
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validator: (value) => {
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if (value < 0 || value > 100) {
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ErrorHandler(`Gauge Chart - Expected prop "innerRadius" to be between 0 and ${RADIUS}`);
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}
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return true;
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},
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},
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/* Separator step, will display a each min + (n * separatorStep), won't show if null */
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separatorStep: {
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type: Number,
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default: 20,
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validator: (value) => {
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if (value !== null && value < 0) {
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ErrorHandler('Gauge Chart - Expected prop "separatorStep" to be null or >= 0');
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}
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return true;
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},
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},
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/* Separator Thickness, unit is in degree */
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separatorThickness: {
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type: Number,
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default: 4,
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},
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/* Gauge color. Can be either string or array of objects (for gradient) */
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gaugeColor: {
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type: [Array, String],
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default: () => ([
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{ offset: 0, color: '#20e253' },
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{ offset: 30, color: '#f6f000' },
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{ offset: 60, color: '#fca016' },
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{ offset: 90, color: '#f80363' },
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]),
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},
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/* Color of the base of the gauge */
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baseColor: {
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type: String,
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default: '#DDDDDD',
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},
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/* Scale interval, won't display any scall if 0 or `null` */
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scaleInterval: {
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type: Number,
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default: 5,
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validator: (value) => {
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if (value !== null && value < 0) {
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ErrorHandler('Gauge Chart - Expected prop "scaleInterval" to be null or >= 0');
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}
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return true;
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},
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},
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/* Transition duration in ms */
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transitionDuration: {
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type: Number,
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default: 1500,
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},
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},
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data() {
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return {
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X_CENTER,
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Y_CENTER,
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RADIUS,
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tweenedValue: this.min,
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};
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},
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computed: {
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/* Height of the viewbox */
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height() {
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const { endAngle, startAngle } = this;
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const { y: yStart } = polarToCartesian(RADIUS, startAngle);
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const { y: yEnd } = polarToCartesian(RADIUS, endAngle);
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return Math.abs(endAngle) <= 180 && Math.abs(startAngle) <= 180
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? Math.max(Y_CENTER, yStart, yEnd)
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: RADIUS * 2;
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},
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/* SVG d property of the path of the base gauge (the colored one) */
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basePath() {
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const { startAngle, endAngle } = this;
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return describePath(RADIUS, startAngle, endAngle);
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},
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/* SVG d property of the gauge based on current value, to hide inverse */
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gaugePath() {
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const { endAngle, getAngle, tweenedValue } = this;
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return describePath(RADIUS, getAngle(tweenedValue), endAngle);
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},
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/* Total angle of the gauge */
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totalAngle() {
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const { startAngle, endAngle } = this;
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return Math.abs(endAngle - startAngle);
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},
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/* True if the gauge is a full circle */
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isCircle() {
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return Math.abs(this.totalAngle) === 360;
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},
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/* If gauge color is array, return true so gradient can be used */
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hasGradient() {
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return Array.isArray(this.gaugeColor);
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},
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/* Array of the path of each separator */
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separatorPaths() {
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const {
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separatorStep, getAngle, min, max, separatorThickness, isCircle,
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} = this;
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if (separatorStep > 0) {
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const paths = [];
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let i = isCircle ? min : min + separatorStep;
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for (i; i < max; i += separatorStep) {
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const angle = getAngle(i);
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const halfAngle = separatorThickness / 2;
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paths.push(describePath(RADIUS + 2, angle - halfAngle, angle + halfAngle));
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}
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return paths;
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}
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return null;
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},
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/* Array of line configuration for each scale */
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scaleLines() {
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const {
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scaleInterval, isCircle, min, max, getAngle, innerRadius,
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} = this;
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if (scaleInterval > 0) {
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const lines = [];
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let i = isCircle ? min + scaleInterval : min;
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for (i; i < max + scaleInterval; i += scaleInterval) {
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const angle = getAngle(i);
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const startCoordinate = polarToCartesian(innerRadius - 4, angle);
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const endCoordinate = polarToCartesian(innerRadius - 8, angle);
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lines.push({
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xS: startCoordinate.x,
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yS: startCoordinate.y,
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xE: endCoordinate.x,
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yE: endCoordinate.y,
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});
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}
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return lines;
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}
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return null;
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},
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/* Generate a logarithmic scale for smooth animations */
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logScale() {
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const logScale = [];
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for (let i = this.max; i > 1; i -= 1) logScale.push(Math.round(Math.log(i)));
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return logScale;
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},
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},
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watch: {
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/* Update chats value with animation */
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value(newValue) {
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this.animateTo(newValue);
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},
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},
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methods: {
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/* Get an angle for a value */
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getAngle(value) {
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const {
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min, max, startAngle, totalAngle,
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} = this;
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const totalValue = (max - min) || 1;
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return ((value * totalAngle) / totalValue) + startAngle;
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},
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/* Increment the charts current value with logarithmic delays, until it equals new value */
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animateTo(newValue) {
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let currentValue = this.tweenedValue;
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let indexCounter = 0; // Keeps track of number of moves
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const forward = currentValue < newValue; // Direction
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const moveOnePoint = () => {
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currentValue = forward ? currentValue + 1 : currentValue - 1;
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indexCounter += 1;
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setTimeout(() => {
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if ((forward && currentValue <= newValue) || (!forward && currentValue >= newValue)) {
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this.tweenedValue = currentValue;
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moveOnePoint();
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}
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}, this.logScale[indexCounter]);
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};
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moveOnePoint();
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},
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},
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mounted() {
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// Set initial value
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this.animateTo(this.value);
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},
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};
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</script>
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<style lang="css">
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.gauge {
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width: 100%;
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height: 100%;
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}
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</style>
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