examplescene.cpp

/*##############################################################################
## Author: Shaun Reed                                                         ##
## Legal: All Content (c) 2023 Shaun Reed, all rights reserved                ##
## About: Example Qtk scene                                                   ##
##                                                                            ##
## Contact: shaunrd0@gmail.com  | URL: www.shaunreed.com | GitHub: shaunrd0   ##
##############################################################################*/

#include "examplescene.h"
#include <resources.h>

using namespace Qtk;

ExampleScene::ExampleScene()
{
  setSceneName("Example Scene");
  getCamera().getTransform().setTranslation(-8.0f, 0.0f, 10.0f);
  getCamera().getTransform().setRotation(-5.0f, 0.0f, 1.0f, 0.0f);
}

ExampleScene::~ExampleScene() = default;

void ExampleScene::init()
{
  setSkybox(new Qtk::Skybox);

  auto mesh = addObject(
      new Qtk::MeshRenderer("rightTriangle", Triangle(QTK_DRAW_ELEMENTS)));
  mesh->getTransform().setTranslation(-5.0f, 0.0f, -2.0f);

  // QTK_DRAW_ARRAYS is the default for generic shapes in qtk/shape.h
  addObject(new Qtk::MeshRenderer("centerCube", Cube(QTK_DRAW_ARRAYS)))
      ->getTransform()
      .setTranslation(-7.0f, 0.0f, -2.0f);

  mesh = addObject(
      new Qtk::MeshRenderer("leftTriangle", Triangle(QTK_DRAW_ELEMENTS)));
  mesh->getTransform().setTranslation(-9.0f, 0.0f, -2.0f);
  mesh->setDrawType(GL_LINE_LOOP);

  mesh = addObject(
      new Qtk::MeshRenderer("topTriangle", Triangle(QTK_DRAW_ELEMENTS)));
  mesh->getTransform().setTranslation(-7.0f, 2.0f, -2.0f);
  mesh->getTransform().scale(0.25f);

  mesh = addObject(
      new Qtk::MeshRenderer("bottomTriangle", Triangle(QTK_DRAW_ELEMENTS)));
  mesh->getTransform().setTranslation(-7.0f, -2.0f, -2.0f);
  mesh->getTransform().scale(0.25f);
  mesh->setDrawType(GL_LINE_LOOP);
  mesh->setColor(GREEN);
}

void ExampleScene::draw()
{
  // The base class method _must_ be called first, before additional logic.
  Scene::draw();

  // No additional custom draw logic for this example.
  // QtkScene in Qtk desktop application is an example using custom draw logic.
}

void ExampleScene::update()
{
  auto top_triangle = MeshRenderer::getInstance("topTriangle");
  auto bottom_triangle = MeshRenderer::getInstance("bottomTriangle");

  // Pitch forward and roll sideways
  MeshRenderer::getInstance("leftTriangle")
      ->getTransform()
      .rotate(0.75f, 1.0f, 0.0f, 0.0f);
  MeshRenderer::getInstance("rightTriangle")
      ->getTransform()
      .rotate(0.75f, 0.0f, 0.0f, 1.0f);

  // Make the top and bottom triangles slide left-to-right.
  static float translateX = 0.025f;
  float limit = -9.0f;  // Origin position.x - 2.0f
  float posX = top_triangle->getTransform().getTranslation().x();
  if (posX < limit || posX > limit + 4.0f) {
    translateX = -translateX;
  }

  top_triangle->getTransform().translate(translateX, 0.0f, 0.0f);
  bottom_triangle->getTransform().translate(-translateX, 0.0f, 0.0f);

  // Apply some rotation to the triangles as they move left-to-right.
  top_triangle->getTransform().rotate(0.75f, 0.2f, 0.0f, 0.4f);
  bottom_triangle->getTransform().rotate(0.75f, 0.0f, 0.2f, 0.4f);

  MeshRenderer::getInstance("centerCube")
      ->getTransform()
      .rotate(0.75f, 0.2f, 0.4f, 0.6f);
}