A2FingerTransformArea.h

/*
 * AUI Framework - Declarative UI toolkit for modern C++20
 * Copyright (C) 2020-2024 Alex2772 and Contributors
 *
 * SPDX-License-Identifier: MPL-2.0
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */
 
#pragma once
 
#include "AUI/View/AViewContainer.h"
#include "AView.h"
#include "AUI/Util/AAngleRadians.h"
 
 
struct A2DTransform {
    glm::vec2 offset = {0.f, 0.f};
    AAngleRadians rotation;
    float scale = 1.f;
 
 
    void applyDelta(const A2DTransform& other) {
        scale *= other.scale;
        offset += other.offset;
        rotation += other.rotation;
    }
};
 
class API_AUI_VIEWS A2FingerTransformArea: public AViewContainer
{
public:
    A2FingerTransformArea();
 
    void onPointerPressed(const APointerPressedEvent& event) override;
    void onPointerMove(glm::vec2 pos, const APointerMoveEvent& event) override;
    void onPointerReleased(const APointerReleasedEvent& event) override;
 
    bool consumesClick(const glm::ivec2& pos) override;
 
signals:
    emits<A2DTransform> transformed;
 
private:
    struct TrackedPoint {
        glm::vec2 pos;
        APointerIndex pointerIndex;
    };
    ASmallVector<TrackedPoint, 8> mTrackedPoints;
 
};