- Qt 6.5
- Qt Quick 3D
- Qt Quick 3D Examples and Tutorials
- Qt Quick 3D - Scene Effects Example
- Qt Quick 3D | Commercial or GPLv3

# Qt Quick 3D - Scene Effects Example

     // Copyright (C) 2022 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
         property alias color: root.color

         width: 100
         height: 26

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

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

             Rectangle {
                 anchors.fill: parent
                 anchors.margins: 4
                 color: colorPicker.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

             RowLayout {
                 anchors.centerIn: parent
                 id: root
                 property color color: "red"
                 spacing: 0

                 Item {
                     width: 135
                     height: 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

                             function handleMouseMove(x, y, width) {
                                 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

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

                                 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)
                             }

                             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()
                     }
                 }

                 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 {
                     width: 250
                     SectionLayout {
                         title: "RGB"
                         id: rgbSection
                         property int redValue: 0
                         property int greenValue: 0
                         property int blueValue: 0

                         function updateRGB() {
                             root.color = Qt.rgba(redValue / 255, greenValue / 255, blueValue / 255, alphaSection.alphaValue / 255)
                             reticule.reflectColor(root.color.hsvHue, root.color.hsvSaturation)
                         }

                         RowLayout {
                             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 (activeFocus)
                                             rgbSection.updateRGB()
                                     }
                                 }
                             }
                             SpinBox {
                                 from: 0
                                 to: 255
                                 value: rgbSection.redValue
                                 onValueChanged: {
                                     if (value !== rgbSection.redValue) {
                                         rgbSection.redValue = value
                                         if (activeFocus)
                                             rgbSection.updateRGB()
                                     }
                                 }
                             }
                         }
                         RowLayout {
                             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 (activeFocus)
                                             rgbSection.updateRGB()
                                     }
                                 }
                             }
                             SpinBox {
                                 from: 0
                                 to: 255
                                 value: rgbSection.greenValue
                                 onValueChanged: {
                                     if (value !== rgbSection.greenValue) {
                                         rgbSection.greenValue = value
                                         if (activeFocus)
                                             rgbSection.updateRGB()
                                     }
                                 }
                             }
                         }
                         RowLayout {
                             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 (activeFocus)
                                             rgbSection.updateRGB()
                                     }
                                 }
                             }
                             SpinBox {
                                 from: 0
                                 to: 255
                                 value: rgbSection.blueValue
                                 onValueChanged: {
                                     if (value !== rgbSection.blueValue) {
                                         rgbSection.blueValue = value
                                         if (activeFocus)
                                             rgbSection.updateRGB()
                                     }
                                 }
                             }
                         }
                         RowLayout {
                             Label {
                                 text: "Hex:"
                                 Layout.fillWidth: true
                             }
                             TextField {
                                 id: hexTextField
                                 maximumLength: 6
                                 implicitWidth: 75

                                 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)
                                 }

                             }
                             Connections {
                                 target: rgbSection
                                 function onRedValueChanged() {
                                     hexTextField.updateText()
                                 }
                                 function onGreenValueChanged() {
                                     hexTextField.updateText()
                                 }
                                 function onBlueValueChanged() {
                                     hexTextField.updateText()
                                 }
                             }
                         }
                     }

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

                         function updateHSV() {
                             root.color = Qt.hsva(hueValue / 360, saturationValue / 100, valueValue / 100, alphaSection.alphaValue / 255)
                             reticule.reflectColor(root.color.hsvHue, root.color.hsvSaturation)
                         }

                         RowLayout {
                             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 (activeFocus)
                                             hsvSection.updateHSV()
                                     }
                                 }
                             }
                             SpinBox {
                                 from: 0
                                 to: 360
                                 value: hsvSection.hueValue
                                 onValueChanged: {
                                     if (value !== hsvSection.hueValue) {
                                         hsvSection.hueValue = value
                                         if (activeFocus)
                                             hsvSection.updateHSV()
                                     }
                                 }
                             }
                         }

                         RowLayout {
                             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 (activeFocus)
                                             hsvSection.updateHSV()
                                     }
                                 }
                             }
                             SpinBox {
                                 from: 0
                                 to: 100
                                 value: hsvSection.saturationValue
                                 onValueChanged: {
                                     if (value !== hsvSection.saturationValue) {
                                         hsvSection.saturationValue = value
                                         if (activeFocus)
                                             hsvSection.updateHSV()
                                     }
                                 }
                             }
                         }

                         RowLayout {
                             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 (activeFocus)
                                             hsvSection.updateHSV()
                                     }
                                 }
                             }
                             SpinBox {
                                 from: 0
                                 to: 100
                                 value: hsvSection.valueValue
                                 onValueChanged: {
                                     if (value !== hsvSection.valueValue) {
                                         hsvSection.valueValue = value
                                         if (activeFocus)
                                             hsvSection.updateHSV()
                                     }
                                 }
                             }
                         }
                     }

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

                         RowLayout {
                             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 (activeFocus)
                                             hsvSection.updateHSV()
                                     }
                                 }
                             }
                             SpinBox {
                                 from: 0
                                 to: 255
                                 value: alphaSection.alphaValue
                                 onValueChanged: {
                                     if (value !== alphaSection.alphaValue) {
                                         alphaSection.alphaValue = value
                                         if (activeFocus)
                                             hsvSection.updateHSV()
                                     }
                                 }
                             }
                         }
                     }
                 }
             }
         }
     }