blob: fd2cbce5bbf8da4f933be54abf240159e14361b5 [file] [log] [blame]
// Copyright 2016 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/ui/examples/spinning_square/spinning_square_view.h"
#include <math.h>
#include <algorithm>
namespace examples {
namespace {
constexpr float kBackgroundElevation = 0.f;
constexpr float kSquareElevation = 8.f;
constexpr float kSpeed = 0.25f;
constexpr float kSecondsPerNanosecond = .000'000'001f;
} // namespace
SpinningSquareView::SpinningSquareView(scenic::ViewContext context)
: BaseView(std::move(context), "Spinning Square"),
background_node_(session()),
square_node_(session()) {
scenic::Material background_material(session());
background_material.SetColor(0x67, 0x3a, 0xb7, 0xff); // Deep Purple 500
background_node_.SetMaterial(background_material);
root_node().AddChild(background_node_);
scenic::Material square_material(session());
square_material.SetColor(0xf5, 0x00, 0x57, 0xff); // Pink A400
square_node_.SetMaterial(square_material);
root_node().AddChild(square_node_);
}
SpinningSquareView::~SpinningSquareView() {}
void SpinningSquareView::OnSceneInvalidated(fuchsia::images::PresentationInfo presentation_info) {
if (!has_logical_size())
return;
uint64_t presentation_time = presentation_info.presentation_time;
if (!start_time_)
start_time_ = presentation_time;
const float center_x = logical_size().x * .5f;
const float center_y = logical_size().y * .5f;
const float square_size = std::min(logical_size().x, logical_size().y) * .6f;
const float t = fmod((presentation_time - start_time_) * kSecondsPerNanosecond * kSpeed, 1.f);
const float angle = t * M_PI * 2;
scenic::Rectangle background_shape(session(), logical_size().x, logical_size().y);
background_node_.SetShape(background_shape);
background_node_.SetTranslation({center_x, center_y, -kBackgroundElevation});
scenic::Rectangle square_shape(session(), square_size, square_size);
square_node_.SetShape(square_shape);
square_node_.SetTranslation({center_x, center_y, -kSquareElevation});
square_node_.SetRotation({0.f, 0.f, sinf(angle * .5f), cosf(angle * .5f)});
InvalidateScene();
}
} // namespace examples