TunerScreen: first work with qmlscene

qml/CircleMeter.qml

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+import QtQuick 2.0
+
+/**
+ * Meter in half circle
+ */
+
+Item {
+	/// current level
+	property double level: 0
+	/// minimum level
+	property double min: -1
+	/// maximum level
+	property double max: 1
+	/// theme object
+	property QtObject theme
+
+	Canvas {
+		id: canvas
+		anchors.fill: parent
+		onPaint: {
+			var ctx = canvas.getContext('2d');
+			ctx.strokeStyle = theme.primaryColor
+			ctx.lineWidth = 1
+			ctx.beginPath()
+			ctx.moveTo(0,height - 1)
+			ctx.bezierCurveTo(0, 0, width * 0.5 * (1 - Math.cos(Math.PI/4)), height  * Math.sin(Math.PI/4), width / 2, 0)
+			//ctx.closePath()
+			ctx.stroke()
+			console.log("canvas done")
+		}
+	}
+}

qml/Scene.qml

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+import QtQuick 2.0
+
+/**
+ *  display tuner screen with qmlscene
+ *  to work on qml files
+ */
+
+Item {
+	width: 600
+	height: 400
+
+	Item {
+		id: theme
+		property color primaryColor: "#000000"
+		property color secondaryColor: "#444444"
+		property int paddingSmall: 4
+		property int paddingLarge: 20
+		property int fontSizeSmall: 10
+		property int fontSizeMedium: 16
+		property int fontSizeLarge: 25
+	}
+
+	Item {
+		id: tuner
+		property int note: 2
+		property int octave: 4
+		property double freq: 440
+		property double deviation: 0.1
+	}
+
+	TunerScreen {
+		tuner: tuner
+		theme: theme
+	}
+}

qml/TunerScreen.qml

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+import QtQuick 2.0
+
+/**
+ * Main tuner screen
+ *
+ */
+
+Item {
+	/// tuner object
+	property QtObject tuner
+	/// theme corresponding to Silica Theme object
+	property QtObject theme
+
+	anchors.fill: parent
+
+	CircleMeter {
+		theme: parent.theme
+		anchors.fill: parent
+	}
+}