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// Copyright (C) 2024 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
import QtQuick
Item {
id: joystick
property real joystickRadius: width > height ? height * 0.5 : width * 0.5
property real stickRadius: joystickRadius * 0.2
property alias value: stick.position
signal updateReady()
width: 100
height: 100
FrameAnimation {
running: true
property vector2d previousPosition: Qt.vector2d(0, 0)
onTriggered: {
// If the stick is not in the deadzone, update the value
const isInDeadzone = stick.position.length() < 0.05
if (!isInDeadzone)
joystick.updateReady()
}
}
function normalizePosition(position) {
return Qt.vector2d(position.x / joystickRadius, -position.y / joystickRadius);
}
Rectangle {
id: joystickBg
anchors.fill: parent
color: "transparent"
border.color: "black"
border.width: 3
radius: joystick.joystickRadius
Item {
id: stick
property real xPos: 0
property real yPos: 0
property vector2d position: Qt.vector2d(0, 0)
function resetPosition() {
setPosition(Qt.point(0, 0));
joystick.updateReady()
}
function setPosition(point) {
xPos = point.x;
yPos = point.y;
position = normalizePosition(Qt.point(xPos, yPos));
stickBg.x = xPos;
stickBg.y = yPos;
}
width: 2 * joystick.stickRadius
height: 2 * joystick.stickRadius
anchors.centerIn: parent
Rectangle {
id: stickBg
x: parent.width / 2 - width / 2
y: parent.height / 2 - height / 2
width: 2 * joystick.stickRadius
height: 2 * joystick.stickRadius
color: "gray"
border.color: "black"
border.width: 2
radius: joystick.stickRadius
MouseArea {
id: mouseArea
anchors.fill: parent
preventStealing: true
property real startX: 0
property real startY: 0
onPressed: {
startX = mouseX;
startY = mouseY;
}
onPositionChanged: {
var deltaX = stick.xPos + (mouseX - startX);
var deltaY = stick.yPos + (mouseY - startY);
var distance = Math.sqrt(deltaX * deltaX + deltaY * deltaY);
if (distance <= joystick.joystickRadius - joystick.stickRadius) {
stick.setPosition(Qt.point(deltaX, deltaY));
} else {
var maxDeltaX = (joystick.joystickRadius - joystick.stickRadius) * deltaX / distance;
var maxDeltaY = (joystick.joystickRadius - joystick.stickRadius) * deltaY / distance;
stick.setPosition(Qt.point(maxDeltaX, maxDeltaY));
}
}
onReleased: {
stick.resetPosition();
}
}
}
}
}
}
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