circular gauge rendering (wip)

WebApp/src/components/widgets/gauge-circular.tsx

@@ -0,0 +1,81 @@
+import m from 'mithril';
+import { Gauge } from 'components/widgets/gauge';
+import { Pipe } from 'utilities/pipe';
+
+require('./gauge-circular.css');
+
+export class GaugeCircular extends Gauge {
+	constructor(vnode: any) {
+		super(vnode);
+	}
+	
+	createSvg(svgElement: SVGElement) {
+		let w = Math.round(svgElement.clientWidth);
+		let h = Math.round(svgElement.clientHeight);
+		
+		svgElement.setAttribute('viewBox', "0 0 "+w+" "+h);
+		
+		let svgRound = (v: number) => Math.round(v * 100.0) / 100.0;
+		
+		const arcRatio = 0.75; // from 0.5 for half circle to 1.0 for full circle
+		const gaugeWidthRatio = 0.15; // relative to the smallest dimension of the drawing area
+		const lineThickness = 1;
+		
+		let gaugeWidth = Math.round(Math.min(w, h) * gaugeWidthRatio);
+		let gaugeRadius = Math.round(Math.min(w, h) * 0.5 - gaugeWidth * 0.5 - lineThickness - 1);
+		let cx = Math.round(w * 0.5); let cy = Math.round(h * 0.5);
+		
+		let openingHalfAngle = Math.PI * (1.0 - arcRatio);
+		let arcLength = Math.PI * 2.0 * gaugeRadius * arcRatio;
+		let startx = svgRound(cx - Math.sin(openingHalfAngle) * gaugeRadius);
+		let starty = svgRound(cy + Math.cos(openingHalfAngle) * gaugeRadius);
+		let dx = svgRound(2.0 * Math.sin(openingHalfAngle) * gaugeRadius);
+		
+		let outlineArcRatio = (arcLength + lineThickness*2.0) / (Math.PI * 2.0 * gaugeRadius);
+		let outlineOpeningHalfAngle = Math.PI * (1.0 - outlineArcRatio);
+		let outlineStartx = svgRound(cx - Math.sin(outlineOpeningHalfAngle) * gaugeRadius);
+		let outlineStarty = svgRound(cy + Math.cos(outlineOpeningHalfAngle) * gaugeRadius);
+		let outlineDx = svgRound(2.0 * Math.sin(outlineOpeningHalfAngle) * gaugeRadius);
+
+		let bgOutline = document.createElementNS('http://www.w3.org/2000/svg', 'path');
+		bgOutline.setAttribute('d', 'M'+outlineStartx+' '+outlineStarty+' a'+gaugeRadius+' '+gaugeRadius+' 0 1 1 '+outlineDx+' 0');
+		bgOutline.setAttribute('style', 'stroke-width: '+(gaugeWidth+lineThickness*2));
+		bgOutline.classList.add('gauge-bg-outline');
+		svgElement.append(bgOutline);
+
+		let bg = document.createElementNS('http://www.w3.org/2000/svg', 'path');
+		bg.setAttribute('d', 'M'+startx+' '+starty+' a'+gaugeRadius+' '+gaugeRadius+' 0 1 1 '+dx+' 0');
+		bg.setAttribute('style', 'stroke-width: '+(gaugeWidth));
+		bg.classList.add('gauge-bg');
+		svgElement.append(bg);
+		
+		let barHeight = 15;
+		const barGap = barHeight * 0.2;
+		let numBars = Math.round(h / (barHeight + barGap));
+		
+		let bh = (h - (numBars+1)*barGap) / numBars;
+		barHeight = Math.round(bh);
+		
+		/*for(let barIdx = 0; barIdx < numBars; ++barIdx) {
+			let bar = document.createElementNS('http://www.w3.org/2000/svg', 'rect');
+			bar.setAttribute('width', (w - barGap * 2).toString());
+			bar.setAttribute('height', barHeight.toString());
+			bar.classList.add('gauge-bar');
+			bar.classList.toggle('lit', false);
+			
+			bar.setAttribute('x', barGap.toString());
+			bar.setAttribute('y', (h - barIdx * (bh+barGap) - barGap - barHeight).toString());
+			
+			svgElement.append(bar);
+			
+			this.bars.push(bar);
+		}*/
+	}
+	
+	oncreate(vnode: any) {
+		let svgElement: SVGElement = vnode.dom.querySelector('svg');
+		this.createSvg(svgElement);
+		
+		super.oncreate(vnode);
+	}
+}

WebApp/src/components/widgets/gauge.css

@@ -1,6 +1,11 @@
 div.gauge {
 	display: flex;
 	flex-direction: column;
+	text-align: center;
+}
+
+div.gauge svg {
+	flex: 1;
 }
 
 div.gauge span.integral-value {
@@ -23,6 +28,16 @@ rect.gauge-bg {
 	stroke: rgb(0,0,0)
 }
 
+path.gauge-bg-outline {
+	stroke: rgb(0,0,0);
+	fill: none;
+}
+
+path.gauge-bg {
+	stroke: rgb(255,255,255);
+	fill: none;
+}
+
 rect.gauge-bar {
 	fill: rgb(230,230,230);
 	stroke-width: 1;

WebApp/src/components/widgets/widget.css

@@ -1,3 +1,11 @@
-div.widget svg {
+div.widgets-row {
-	flex: 1;
+	padding-top: 0.5rem;
+	padding-bottom: 0.5rem;
+	display: flex;
+	flex-direction: row;
+}
+
+div.widget {
+	flex: 1;
+	margin: 0.2rem;
 }

WebApp/src/pages/dashboard/dashboard-page.css

@@ -2,12 +2,3 @@ div.dashboard-page {
 	width: 100%;
 	height: 100%;
 }
-
-div.widgets-row {
-	display: flex;
-	flex-direction: row;
-}
-
-div.widget {
-	flex: 1;
-}

WebApp/src/pages/dashboard/dashboard-page.tsx

@@ -5,6 +5,7 @@ import { Pipe } from 'utilities/pipe';
 
 import { Clock } from 'components/widgets/clock';
 import { GaugeLinear } from 'components/widgets/gauge-linear';
+import { GaugeCircular } from 'components/widgets/gauge-circular';
 
 require('./dashboard-page.css');
 
@@ -52,7 +53,7 @@ export class DashboardPage extends Page {
 				</div>
 				<div class="widgets-row" style="height: 40%">
 					<GaugeLinear widgetWidth={0.2} gaugeValue={this.power} gaugeMaxValue={999.0} unit="W" />
-					<GaugeLinear widgetWidth={0.6} gaugeValue={this.speed} gaugeMaxValue={50.0} decimals={1} unit="km/h" />
+					<GaugeCircular widgetWidth={0.6} gaugeValue={this.speed} gaugeMaxValue={50.0} decimals={1} unit="km/h" />
 					<GaugeLinear widgetWidth={0.2} gaugeValue={this.battery} gaugeMaxValue={100.0} unit="%" />
 				</div>
 			</div>