made gradient rotatable

Components/MidpointGradient.qml

@@ -1,23 +1,75 @@
 import QtQuick
+import QtQuick.Shapes
 
-Gradient {
+Item {
   id: root
 
-  required property color color
+  property real angle: 0        // Degrees; 0 = transparent left, colour right
-  property double midpoint: 0.6
+  readonly property real angleRadians: angle * Math.PI / 180.0
+  property real blur: 0.0       // 0 = sharp, 1 = very soft
 
-  GradientStop {
+  // Public API
-	color: "transparent"
+  property color color: "#4da3ffff"
-	position: 0.0
+
+  // Half the diagonal ensures the gradient covers the entire item.
+  readonly property real gradientRadius: Math.sqrt(width * width + height * height) / 2.0
+  property real midpoint: 0.5   // 0..1
+  property double radius: 10
+  readonly property real safeBlur: Math.max(blur, 0.00001)
+  readonly property real safeMidpoint: clamp01(midpoint)
+  readonly property real transitionEnd: clamp01(safeMidpoint + safeBlur / 2.0)
+  readonly property real transitionStart: clamp01(safeMidpoint - safeBlur / 2.0)
+  readonly property color transparentColor: Qt.rgba(color.r, color.g, color.b, 0.0)
+
+  function clamp01(value) {
+	return Math.max(0.0, Math.min(1.0, value));
   }
 
-  GradientStop {
+  Behavior on color {
-	color: "transparent"
+	ColorAnimation {
-	position: root.midpoint
+	  duration: 100
+	}
   }
 
-  GradientStop {
+  Shape {
-	color: root.color
+	anchors.fill: parent
-	position: 1.0
+	preferredRendererType: Shape.CurveRenderer
+
+	ShapePath {
+	  strokeWidth: -1
+
+	  fillGradient: LinearGradient {
+		x1: root.width / 2.0 - root.gradientRadius * Math.cos(root.angleRadians)
+		x2: root.width / 2.0 + root.gradientRadius * Math.cos(root.angleRadians)
+		y1: root.height / 2.0 - root.gradientRadius * Math.sin(root.angleRadians)
+		y2: root.height / 2.0 + root.gradientRadius * Math.sin(root.angleRadians)
+
+		GradientStop {
+		  color: root.transparentColor
+		  position: 0.0
+		}
+
+		GradientStop {
+		  color: root.transparentColor
+		  position: root.transitionStart
+		}
+
+		GradientStop {
+		  color: root.color
+		  position: root.transitionEnd
+		}
+
+		GradientStop {
+		  color: root.color
+		  position: 1.0
+		}
+	  }
+
+	  PathRectangle {
+		height: root.height
+		radius: Math.min(root.radius, Math.min(width, height) / 2.0)
+		width: root.width
+	  }
+	}
   }
 }