tests/unit_tests/runtime/scroll_test.cpp

#include "rive/file.hpp"
#include "rive/animation/linear_animation.hpp"
#include "rive/animation/linear_animation_instance.hpp"
#include "rive/animation/state_machine_instance.hpp"
#include "rive/viewmodel/viewmodel.hpp"
#include "rive/viewmodel/viewmodel_instance_number.hpp"
#include "rive/viewmodel/viewmodel_instance_trigger.hpp"
#include "utils/serializing_factory.hpp"
#include "rive_file_reader.hpp"
#include <catch.hpp>
#include <cstdio>
#include <cstring>

using namespace rive;

TEST_CASE("multiple scrolliing artboards", "[silver]")
{
    SerializingFactory silver;
    auto file = ReadRiveFile("assets/scroll_test.riv", &silver);

    auto artboard = file->artboardDefault();
    silver.frameSize(artboard->width(), artboard->height());

    auto stateMachine = artboard->stateMachineAt(0);
    stateMachine->advanceAndApply(0.1f);

    auto renderer = silver.makeRenderer();
    artboard->draw(renderer.get());

    silver.addFrame();

    // Click in the middle of the state machine.
    stateMachine->pointerDown(
        rive::Vec2D(artboard->width() / 2.0f, artboard->height() / 2.0f));
    // Advance and apply twice to take the transition and apply the next state.
    stateMachine->advanceAndApply(0.1f);
    stateMachine->advanceAndApply(1.0f);

    artboard->draw(renderer.get());

    silver.addFrame();

    // Start scroll on right element
    stateMachine->pointerDown(rive::Vec2D(260.0f, 500.0f));
    // Advance and apply twice to take the transition and apply the next state.
    stateMachine->advanceAndApply(0.1f);
    stateMachine->advanceAndApply(1.0f);
    artboard->draw(renderer.get());

    float yMovement = 400.0f;
    float xMovement = 100.0f;

    int frames = (int)(1.0f / 0.016f);
    for (int i = 0; i < frames; i++)
    {
        silver.addFrame();
        stateMachine->pointerMove(
            rive::Vec2D(260.0f - (i * xMovement / frames),
                        500.0f - (i * yMovement / frames)));
        // Advance and apply twice to take the transition and apply the next
        // state.
        stateMachine->advanceAndApply(0.1f);
        stateMachine->advanceAndApply(0.016f);
        artboard->draw(renderer.get());
    }
    silver.addFrame();
    stateMachine->pointerUp(
        rive::Vec2D(260.0f - xMovement, 500.0f - yMovement));
    stateMachine->advanceAndApply(0.1f);
    stateMachine->advanceAndApply(0.016f);
    artboard->draw(renderer.get());

    silver.addFrame();

    // Start scroll on left element
    stateMachine->pointerDown(rive::Vec2D(50.0f, 500.0f));
    // Advance and apply twice to take the transition and apply the next state.
    stateMachine->advanceAndApply(0.1f);
    stateMachine->advanceAndApply(1.0f);
    artboard->draw(renderer.get());

    for (int i = 0; i < frames; i++)
    {
        silver.addFrame();
        stateMachine->pointerMove(
            rive::Vec2D(50.0f + (i * xMovement / frames),
                        500.0f - (i * yMovement / frames)));
        // Advance and apply twice to take the transition and apply the next
        // state.
        stateMachine->advanceAndApply(0.1f);
        stateMachine->advanceAndApply(0.016f);
        artboard->draw(renderer.get());
    }
    silver.addFrame();
    stateMachine->pointerUp(rive::Vec2D(50.0f + xMovement, 500.0f - yMovement));
    stateMachine->advanceAndApply(0.1f);
    stateMachine->advanceAndApply(0.016f);
    artboard->draw(renderer.get());

    CHECK(silver.matches("scroll_test"));
}