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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
import QtQuick
import QtQuick.Layouts
import "components"
Rectangle {
width: 1024
height: 1024
color: "#444"
ColumnLayout {
x: -15; width: 80
height: parent.height
Slider {
id: hueSlider
width: 80; height: 200
Layout.fillHeight: true
label: "hue"
Rectangle {
color: "beige"
width: 30
height: 25
anchors.bottom: parent.bottom
anchors.bottomMargin: 2
anchors.horizontalCenter: parent.horizontalCenter
Rectangle {
border.color: "white"
color: canvas.drawingColor
anchors.fill: parent
}
}
}
Slider {
id: saturationSlider
width: 80; height: 200
Layout.fillHeight: true
label: "sat"
}
Slider {
id: lightnessSlider
width: 80; height: 200
Layout.fillHeight: true
label: "light"
}
}
ColumnLayout {
x: parent.width - 65; width: 80
height: parent.height
Slider {
id: widthSlider
width: 80; height: 200
Layout.fillHeight: true
label: "width"
}
Slider {
id: alphaSlider
width: 80; height: 200
Layout.fillHeight: true
label: "alpha"
}
}
Rectangle {
id: rect
width: 640
height: 480
color: "beige"
anchors {
fill: parent
margins: 10
leftMargin: 50
rightMargin: 50
}
Canvas {
id: canvas
anchors.fill: parent
antialiasing: true
renderTarget: Canvas.FramebufferObject
property color drawingColor: Qt.hsla(hueSlider.value / 100.0,
saturationSlider.value / 100.0,
lightnessSlider.value / 100.0,
alphaSlider.value / 100.0)
property var points: []
property var pressures: []
property var pointerType: PointerDevice.Pen
onPaint: {
if (points.length < 2)
return
var ctx = canvas.getContext('2d');
ctx.save()
ctx.strokeStyle = pointerType === PointerDevice.Pen ? drawingColor : "beige"
ctx.lineCap = "round"
if (pressures.length === points.length) {
for (var i = 1; i < points.length; i++) {
ctx.lineWidth = pressures[i] * widthSlider.value
ctx.beginPath()
ctx.moveTo(points[i - 1].x, points[i - 1].y)
ctx.lineTo(points[i].x, points[i].y)
ctx.stroke()
}
points = points.slice(points.length - 2, 1)
pressures = pressures.slice(pressures.length - 2, 1)
} else {
ctx.beginPath()
ctx.moveTo(points[0].x, points[0].y)
for (var i = 1; i < points.length; i++)
ctx.lineTo(points[i].x, points[i].y)
ctx.lineWidth = widthSlider
ctx.stroke()
points = points.slice(points.length - 2, 1)
pressures = []
}
ctx.restore()
}
}
Text {
text: "draw with a drawing-tablet stylus"
anchors {
bottom: parent.bottom
horizontalCenter: parent.horizontalCenter
margins: 6
}
}
PointHandler {
acceptedPointerTypes: PointerDevice.Pen
onActiveChanged:
if (active) {
canvas.pointerType = PointerDevice.Pen
} else {
canvas.points = []
canvas.pressures = []
}
onPointChanged:
if (active) {
canvas.points.push(point.position)
canvas.pressures.push(point.pressure)
canvas.requestPaint()
}
}
PointHandler {
acceptedPointerTypes: PointerDevice.Eraser
onActiveChanged:
if (active) {
canvas.pointerType = PointerDevice.Eraser
} else {
canvas.points = []
canvas.pressures = []
}
onPointChanged:
if (active) {
canvas.points.push(point.position)
canvas.pressures.push(point.pressure)
canvas.requestPaint()
}
}
HoverHandler {
id: stylusHandler
acceptedDevices: PointerDevice.Stylus
acceptedPointerTypes: PointerDevice.Pen
target: Image {
parent: rect
source: stylusHandler.point.rotation === 0 ?
"images/cursor-pencil.png" : "images/cursor-felt-marker.png"
visible: stylusHandler.hovered
rotation: stylusHandler.point.rotation
x: stylusHandler.point.position.x
y: stylusHandler.point.position.y
}
}
HoverHandler {
id: airbrushHandler
acceptedDevices: PointerDevice.Airbrush
acceptedPointerTypes: PointerDevice.Pen
target: Image {
parent: rect
source: "images/cursor-airbrush.png"
visible: airbrushHandler.hovered
x: airbrushHandler.point.position.x
y: airbrushHandler.point.position.y
}
}
HoverHandler {
id: eraserHandler
acceptedPointerTypes: PointerDevice.Eraser
target: Image {
parent: rect
source: "images/cursor-eraser.png"
visible: eraserHandler.hovered
x: eraserHandler.point.position.x
y: eraserHandler.point.position.y - 32
}
}
}
}
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