DashboardGaugeStyle.qml Example File

dashboard/qml/DashboardGaugeStyle.qml
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import QtQuick 2.2 import QtQuick.Controls.Styles 1.4 CircularGaugeStyle { tickmarkInset: toPixels(0.04) minorTickmarkInset: tickmarkInset labelStepSize: 20 labelInset: toPixels(0.23) property real xCenter: outerRadius property real yCenter: outerRadius property real needleLength: outerRadius - tickmarkInset * 1.25 property real needleTipWidth: toPixels(0.02) property real needleBaseWidth: toPixels(0.06) property bool halfGauge: false function toPixels(percentage) { return percentage * outerRadius; } function degToRad(degrees) { return degrees * (Math.PI / 180); } function radToDeg(radians) { return radians * (180 / Math.PI); } function paintBackground(ctx) { if (halfGauge) { ctx.beginPath(); ctx.rect(0, 0, ctx.canvas.width, ctx.canvas.height / 2); ctx.clip(); } ctx.beginPath(); ctx.fillStyle = "black"; ctx.ellipse(0, 0, ctx.canvas.width, ctx.canvas.height); ctx.fill(); ctx.beginPath(); ctx.lineWidth = tickmarkInset; ctx.strokeStyle = "black"; ctx.arc(xCenter, yCenter, outerRadius - ctx.lineWidth / 2, outerRadius - ctx.lineWidth / 2, 0, Math.PI * 2); ctx.stroke(); ctx.beginPath(); ctx.lineWidth = tickmarkInset / 2; ctx.strokeStyle = "#222"; ctx.arc(xCenter, yCenter, outerRadius - ctx.lineWidth / 2, outerRadius - ctx.lineWidth / 2, 0, Math.PI * 2); ctx.stroke(); ctx.beginPath(); var gradient = ctx.createRadialGradient(xCenter, yCenter, 0, xCenter, yCenter, outerRadius * 1.5); gradient.addColorStop(0, Qt.rgba(1, 1, 1, 0)); gradient.addColorStop(0.7, Qt.rgba(1, 1, 1, 0.13)); gradient.addColorStop(1, Qt.rgba(1, 1, 1, 1)); ctx.fillStyle = gradient; ctx.arc(xCenter, yCenter, outerRadius - tickmarkInset, outerRadius - tickmarkInset, 0, Math.PI * 2); ctx.fill(); } background: Canvas { onPaint: { var ctx = getContext("2d"); ctx.reset(); paintBackground(ctx); } Text { id: speedText font.pixelSize: toPixels(0.3) text: kphInt color: "white" horizontalAlignment: Text.AlignRight anchors.horizontalCenter: parent.horizontalCenter anchors.top: parent.verticalCenter anchors.topMargin: toPixels(0.1) readonly property int kphInt: control.value } Text { text: "km/h" color: "white" font.pixelSize: toPixels(0.09) anchors.top: speedText.bottom anchors.horizontalCenter: parent.horizontalCenter } } needle: Canvas { implicitWidth: needleBaseWidth implicitHeight: needleLength property real xCenter: width / 2 property real yCenter: height / 2 onPaint: { var ctx = getContext("2d"); ctx.reset(); ctx.beginPath(); ctx.moveTo(xCenter, height); ctx.lineTo(xCenter - needleBaseWidth / 2, height - needleBaseWidth / 2); ctx.lineTo(xCenter - needleTipWidth / 2, 0); ctx.lineTo(xCenter, yCenter - needleLength); ctx.lineTo(xCenter, 0); ctx.closePath(); ctx.fillStyle = Qt.rgba(0.66, 0, 0, 0.66); ctx.fill(); ctx.beginPath(); ctx.moveTo(xCenter, height) ctx.lineTo(width, height - needleBaseWidth / 2); ctx.lineTo(xCenter + needleTipWidth / 2, 0); ctx.lineTo(xCenter, 0); ctx.closePath(); ctx.fillStyle = Qt.lighter(Qt.rgba(0.66, 0, 0, 0.66)); ctx.fill(); } } foreground: null }