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+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+** * Redistributions of source code must retain the above copyright
+** notice, this list of conditions and the following disclaimer.
+** * Redistributions in binary form must reproduce the above copyright
+** notice, this list of conditions and the following disclaimer in
+** the documentation and/or other materials provided with the
+** distribution.
+** * Neither the name of The Qt Company Ltd nor the names of its
+** contributors may be used to endorse or promote products derived
+** from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+
+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
+}