IconGaugeStyle.qml Example File

  /****************************************************************************
  **
  ** 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
  import QtQuick.Extras 1.4

  DashboardGaugeStyle {
      id: fuelGaugeStyle
      minimumValueAngle: -60
      maximumValueAngle: 60
      tickmarkStepSize: 1
      labelStepSize: 1
      labelInset: toPixels(-0.25)
      minorTickmarkCount: 3

      needleLength: toPixels(0.85)
      needleBaseWidth: toPixels(0.08)
      needleTipWidth: toPixels(0.03)

      halfGauge: true

      property string icon: ""
      property color minWarningColor: "transparent"
      property color maxWarningColor: "transparent"
      readonly property real minWarningStartAngle: minimumValueAngle - 90
      readonly property real maxWarningStartAngle: maximumValueAngle - 90

      tickmark: Rectangle {
          implicitWidth: toPixels(0.06)
          antialiasing: true
          implicitHeight: toPixels(0.2)
          color: "#c8c8c8"
      }

      minorTickmark: Rectangle {
          implicitWidth: toPixels(0.03)
          antialiasing: true
          implicitHeight: toPixels(0.15)
          color: "#c8c8c8"
      }

      background: Item {
          Canvas {
              anchors.fill: parent
              onPaint: {
                  var ctx = getContext("2d");
                  ctx.reset();

                  paintBackground(ctx);

                  if (minWarningColor != "transparent") {
                      ctx.beginPath();
                      ctx.lineWidth = fuelGaugeStyle.toPixels(0.08);
                      ctx.strokeStyle = minWarningColor;
                      ctx.arc(outerRadius, outerRadius,
                          // Start the line in from the decorations, and account for the width of the line itself.
                          outerRadius - tickmarkInset - ctx.lineWidth / 2,
                          degToRad(minWarningStartAngle),
                          degToRad(minWarningStartAngle + angleRange / (minorTickmarkCount + 1)), false);
                      ctx.stroke();
                  }
                  if (maxWarningColor != "transparent") {
                      ctx.beginPath();
                      ctx.lineWidth = fuelGaugeStyle.toPixels(0.08);
                      ctx.strokeStyle = maxWarningColor;
                      ctx.arc(outerRadius, outerRadius,
                          // Start the line in from the decorations, and account for the width of the line itself.
                          outerRadius - tickmarkInset - ctx.lineWidth / 2,
                          degToRad(maxWarningStartAngle - angleRange / (minorTickmarkCount + 1)),
                          degToRad(maxWarningStartAngle), false);
                      ctx.stroke();
                  }
              }
          }

          Image {
              source: icon
              anchors.bottom: parent.verticalCenter
              anchors.bottomMargin: toPixels(0.3)
              anchors.horizontalCenter: parent.horizontalCenter
              width: toPixels(0.3)
              height: width
              fillMode: Image.PreserveAspectFit
          }
      }
  }