Qt 5.6 | Qt Quick Extras | Qt Quick Extras - Dashboard | IconGaugeStyle.qml Example File

Qt 5.6.2 Reference Documentation

# IconGaugeStyle.qml Example File

dashboard/qml/IconGaugeStyle.qml

      /****************************************************************************
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      ** Copyright (C) 2015 The Qt Company Ltd.
      ** Contact: http://www.qt.io/licensing/
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      ** This file is part of the examples of the Qt Toolkit.
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      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
              }
          }
      }