Qt Quick 3D - Stencil Outline Extension Example

 // Copyright (C) 2023 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause

 import QtQuick
 import QtQuick.Controls
 import QtQuick.Layouts

 Item {
     id: colorPicker
     property bool isHovered: false
     // Mirror the internal value until re-bound
     property color color: root.color
     onColorChanged: {
         if (root.color != color)
             root.color = color;
     }

     // When we manually edit a new color
     // this is the new color proposal
     signal colorModified(color: color)

     width: 100
     height: 26

     Rectangle {
         id: border
         color: "transparent"
         border.width: 2
         border.color: colorPicker.isHovered ? palette.dark : palette.alternateBase
         anchors.fill: parent

         Image {
             anchors.fill: parent
             anchors.margins: 4
             source: "images/grid_8x8.png"
             fillMode: Image.Tile
         }

         Rectangle {
             anchors.fill: parent
             anchors.margins: 4
             color: root.color
         }

         MouseArea {
             anchors.fill: parent
             hoverEnabled: true
             onEntered: colorPicker.isHovered = true
             onExited: colorPicker.isHovered = false
             onClicked: {
                 colorPickerPopup.open()
             }
         }
     }

     Dialog {
         id: colorPickerPopup
         title: "Color Picker"

         anchors.centerIn: Overlay.overlay
         modal: true
         focus: true
         closePolicy: Popup.CloseOnEscape | Popup.CloseOnPressOutsideParent

         Pane {
             RowLayout {
                 id: root
                 property color color: "red"

                 Item {
                     implicitWidth: 135
                     implicitHeight: 135
                     ShaderEffect {
                         id: hsvWheel
                         anchors.centerIn: parent
                         blending: true
                         width: 128
                         height: 128
                         property real value: 1.0

                         fragmentShader: "qrc:/shaders/huesaturation.frag.qsb"

                         Item {
                             id: reticule

                             function reflectColor(hue, saturation) {
                                 let angleDegrees = hue * 360
                                 if (angleDegrees > 180)
                                     angleDegrees = angleDegrees - 360
                                 let angleRadians = angleDegrees * (Math.PI / 180)
                                 let vector = Qt.vector2d(Math.cos(angleRadians), Math.sin(angleRadians)).normalized().times(0.5).times(saturation)
                                 vector = vector.plus(Qt.vector2d(0.5, 0.5))
                                 reticule.x = vector.x * hsvWheel.width
                                 reticule.y = vector.y * hsvWheel.width
                             }

                             Rectangle {
                                 x: -5
                                 y: -5
                                 width: 10
                                 height: 10
                                 radius: 5
                                 color: "transparent"
                                 border.width: 1
                                 border.color: "black"

                                 Rectangle {
                                     x: 0.5
                                     y: 0.5
                                     width: 9
                                     height: 9
                                     radius: 4.5
                                     color: root.color
                                     border.width: 1
                                     border.color: "white"
                                 }
                             }
                         }

                         MouseArea {
                             anchors.fill: parent
                             preventStealing: true

                             function handleMouseMove(x : real, y : real, width : real) : vector2d {
                                 let normalizedX = x / width - 0.5;
                                 let normalizedY = y / width - 0.5;
                                 let angle = Math.atan2(normalizedY, normalizedX);
                                 let toCenter = Qt.vector2d(normalizedX, normalizedY);
                                 let radius = toCenter.length() * 2.0;
                                 let degrees = angle * (180 / Math.PI)
                                 if (degrees < 0)
                                     degrees = 360 + degrees
                                 let hue = degrees / 360

                                 let color = Qt.hsva(hue, radius, root.color.hsvValue, root.color.a)
                                 colorPicker.colorModified(color)
                                 root.color = color

                                 if (radius <= 1.0)
                                     return Qt.vector2d(x, y)
                                 // Limit to radius of 1.0
                                 toCenter = toCenter.normalized();
                                 let halfWidth = width * 0.5;
                                 let newX = halfWidth * toCenter.x + halfWidth
                                 let newY = halfWidth * toCenter.y + halfWidth
                                 return Qt.vector2d(newX, newY)
                             }

                             onClicked: (mouse) => {
                                             let pos = handleMouseMove(mouse.x, mouse.y, hsvWheel.width)
                                             reticule.x = pos.x;
                                             reticule.y = pos.y;
                             }

                             onPositionChanged: (mouse) => {
                                                 let pos = handleMouseMove(mouse.x, mouse.y, hsvWheel.width)
                                                 reticule.x = pos.x;
                                                 reticule.y = pos.y;
                             }
                         }
                     }
                 }

                 Component.onCompleted: {
                     updateColorSections()
                     reticule.reflectColor(root.color.hsvHue, root.color.hsvSaturation)
                 }

                 Connections {
                     target: root
                     function onColorChanged() {
                         root.updateColorSections()
                         reticule.reflectColor(root.color.hsvHue, root.color.hsvSaturation)
                     }
                 }
                 Connections {
                     target: colorPicker
                     function onColorChanged() {
                         root.color = colorPicker.color
                     }
                 }

                 function updateColorSections() {
                     rgbSection.redValue = root.color.r * 255
                     rgbSection.greenValue = root.color.g * 255
                     rgbSection.blueValue = root.color.b * 255
                     hsvSection.hueValue = root.color.hsvHue * 360
                     hsvSection.saturationValue = root.color.hsvSaturation * 100
                     hsvSection.valueValue = root.color.hsvValue  * 100
                     alphaSection.alphaValue = root.color.a * 255
                 }
                 ColumnLayout {

                     SectionLayout {
                         title: "RGB"
                         id: rgbSection
                         property int redValue: 0
                         property int greenValue: 0
                         property int blueValue: 0
                         implicitWidth: 300

                         function updateRGB() {
                             let color =  Qt.rgba(redValue / 255, greenValue / 255, blueValue / 255, alphaSection.alphaValue / 255)
                             colorPicker.colorModified(color)
                             root.color = color
                         }

                         onRedValueChanged: hexTextField.updateText()
                         onGreenValueChanged: hexTextField.updateText()
                         onBlueValueChanged: hexTextField.updateText()

                         RowLayout {
                             Layout.fillWidth: true
                             Label {
                                 text: "R:"
                             }
                             Slider {
                                 id: redSlider
                                 Layout.fillWidth: true
                                 from: 0
                                 to: 255
                                 value: rgbSection.redValue
                                 onValueChanged: {
                                     if (value !== rgbSection.redValue) {
                                         rgbSection.redValue = value
                                         if (pressed)
                                             rgbSection.updateRGB()
                                     }
                                 }
                             }
                         }
                         SpinBox {
                             Layout.fillWidth: true
                             from: 0
                             to: 255
                             value: rgbSection.redValue
                             onValueChanged: {
                                 if (value !== rgbSection.redValue)
                                     rgbSection.redValue = value
                             }
                             onValueModified: {
                                 rgbSection.updateRGB();
                             }
                         }

                         RowLayout {
                             Layout.fillWidth: true
                             Label {
                                 text: "G:"
                             }
                             Slider {
                                 id: greenSlider
                                 Layout.fillWidth: true
                                 from: 0
                                 to: 255
                                 value: rgbSection.greenValue
                                 onValueChanged: {
                                     if (value !== rgbSection.greenValue) {
                                         rgbSection.greenValue = value
                                         if (pressed)
                                             rgbSection.updateRGB()
                                     }
                                 }
                             }
                         }
                         SpinBox {
                             Layout.fillWidth: true
                             from: 0
                             to: 255
                             value: rgbSection.greenValue
                             onValueChanged: {
                                 if (value !== rgbSection.greenValue)
                                     rgbSection.greenValue = value
                             }
                             onValueModified: {
                                 rgbSection.updateRGB()
                             }
                         }

                         RowLayout {
                             Layout.fillWidth: true
                             Label {
                                 text: "B:"
                             }
                             Slider {
                                 id: blueSlider
                                 Layout.fillWidth: true
                                 from: 0
                                 to: 255
                                 value: rgbSection.blueValue
                                 onValueChanged: {
                                     if (value !== rgbSection.blueValue) {
                                         rgbSection.blueValue = value
                                         if (pressed)
                                             rgbSection.updateRGB()
                                     }
                                 }
                             }
                         }
                         SpinBox {
                             Layout.fillWidth: true
                             from: 0
                             to: 255
                             value: rgbSection.blueValue
                             onValueChanged: {
                                 if (value !== rgbSection.blueValue)
                                     rgbSection.blueValue = value
                             }
                             onValueModified: {
                                 rgbSection.updateRGB()
                             }
                         }

                         Label {
                             text: "Hex:"
                             Layout.fillWidth: true
                         }
                         TextField {
                             id: hexTextField
                             maximumLength: 6
                             Layout.alignment: Qt.AlignRight

                             function updateText() {
                                 if (activeFocus)
                                     return

                                 let redText = rgbSection.redValue.toString(16).toUpperCase()
                                 let greenText = rgbSection.greenValue.toString(16).toUpperCase()
                                 let blueText = rgbSection.blueValue.toString(16).toUpperCase()
                                 if (redText.length == 1)
                                     redText = "0" + redText
                                 if (greenText.length == 1)
                                     greenText = "0" + greenText
                                 if (blueText.length == 1)
                                     blueText = "0" + blueText
                                 text = redText + greenText + blueText;
                             }

                             function expandText(text) {
                                 let newText = text.toUpperCase()
                                 let expandLength = 6 - newText.length
                                 for (let i = 0; i < expandLength; ++i)
                                     newText = "0" + newText
                                 return newText
                             }

                             Component.onCompleted: updateText()
                             validator: RegularExpressionValidator {
                                 regularExpression: /^[0-9A-Fa-f]{0,6}$/
                             }
                             onTextChanged: {
                                 if (!acceptableInput)
                                     return;
                                 let colorText = expandText(text)
                                 rgbSection.redValue = parseInt(colorText.substr(0, 2), 16)
                                 rgbSection.greenValue = parseInt(colorText.substr(2, 2), 16)
                                 rgbSection.blueValue = parseInt(colorText.substr(4, 2), 16)
                                 if (activeFocus)
                                     rgbSection.updateRGB()
                             }

                             onAccepted: {
                                 text = expandText(text)
                             }
                         }
                     }

                     SectionLayout {
                         title: "HSV"
                         id: hsvSection
                         property int hueValue: 0
                         property int saturationValue: 0
                         property int valueValue: 0
                         implicitWidth: 300

                         function updateHSV() {
                             let color = Qt.hsva(hueValue / 360, saturationValue / 100, valueValue / 100, alphaSection.alphaValue / 255)
                             colorPicker.colorModified(color)
                             root.color = color
                         }

                         RowLayout {
                             Layout.fillWidth: true
                             Label {
                                 text: "H:"
                             }
                             Slider {
                                 id: hueSlider
                                 Layout.fillWidth: true
                                 from: 0
                                 to: 360
                                 value: hsvSection.hueValue
                                 onValueChanged: {
                                     if (value !== hsvSection.hueValue) {
                                         hsvSection.hueValue = value
                                         if (pressed)
                                             hsvSection.updateHSV()
                                     }
                                 }
                             }
                         }
                         SpinBox {
                             Layout.fillWidth: true
                             from: 0
                             to: 360
                             value: hsvSection.hueValue
                             onValueChanged: {
                                 if (value !== hsvSection.hueValue)
                                     hsvSection.hueValue = value
                             }
                             onValueModified: {
                                 hsvSection.updateHSV()
                             }
                         }

                         RowLayout {
                             Layout.fillWidth: true
                             Label {
                                 text: "S:"
                             }
                             Slider {
                                 id: saturationSlider
                                 Layout.fillWidth: true
                                 from: 0
                                 to: 100
                                 value: hsvSection.saturationValue
                                 onValueChanged: {
                                     if (value !== hsvSection.saturationValue) {
                                         hsvSection.saturationValue = value
                                         if (pressed)
                                             hsvSection.updateHSV()
                                     }
                                 }
                             }
                         }
                         SpinBox {
                             Layout.fillWidth: true
                             from: 0
                             to: 100
                             value: hsvSection.saturationValue
                             onValueChanged: {
                                 if (value !== hsvSection.saturationValue)
                                     hsvSection.saturationValue = value
                             }
                             onValueModified: {
                                 hsvSection.updateHSV()
                             }
                         }

                         RowLayout {
                             Layout.fillWidth: true
                             Label {
                                 text: "V:"
                             }
                             Slider {
                                 id: valueSlider
                                 Layout.fillWidth: true
                                 from: 0
                                 to: 100
                                 value: hsvSection.valueValue
                                 onValueChanged: {
                                     if (value !== hsvSection.valueValue) {
                                         hsvSection.valueValue = value
                                         if (pressed)
                                             hsvSection.updateHSV()
                                     }
                                 }
                             }
                         }
                         SpinBox {
                             Layout.fillWidth: true
                             from: 0
                             to: 100
                             value: hsvSection.valueValue
                             onValueChanged: {
                                 if (value !== hsvSection.valueValue)
                                     hsvSection.valueValue = value
                             }
                             onValueModified: {
                                 hsvSection.updateHSV()
                             }
                         }

                     }

                     SectionLayout {
                         title: "Opacity / Alpha"
                         id: alphaSection
                         property int alphaValue: 0
                         implicitWidth: 300

                         RowLayout {
                             Layout.fillWidth: true
                             Label {
                                 text: "V:"
                             }
                             Slider {
                                 id: alphaSlider
                                 Layout.fillWidth: true
                                 from: 0
                                 to: 255
                                 value: alphaSection.alphaValue
                                 onValueChanged: {
                                     if (value !== alphaSection.alphaValue) {
                                         alphaSection.alphaValue = value
                                         if (pressed)
                                             hsvSection.updateHSV()
                                     }
                                 }
                             }
                         }
                         SpinBox {
                             Layout.fillWidth: true
                             from: 0
                             to: 255
                             value: alphaSection.alphaValue
                             onValueChanged: {
                                 if (value !== alphaSection.alphaValue)
                                     alphaSection.alphaValue = value
                             }
                             onValueModified: {
                                 hsvSection.updateHSV()
                             }
                         }
                     }
                 }
             }
         }
     }
 }