dali/devel-api/events/hit-test-algorithm.cpp

   1 /*
   2  * Copyright (c) 2023 Samsung Electronics Co., Ltd.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  *
  16  */
  17
  18 // CLASS HEADER
  19 #include <dali/devel-api/events/hit-test-algorithm.h>
  20
  21 // INTERNAL INCLUDES
  22 #include <dali/internal/event/actors/camera-actor-impl.h>
  23 #include <dali/internal/event/common/scene-impl.h>
  24 #include <dali/internal/event/common/stage-impl.h>
  25 #include <dali/internal/event/events/hit-test-algorithm-impl.h>
  26 #include <dali/internal/event/render-tasks/render-task-impl.h>
  27
  28 namespace Dali
  29 {
  30 namespace HitTestAlgorithm
  31 {
  32 bool HitTest(Stage stage, const Vector2& screenCoordinates, Results& results, HitTestFunction func, const Integration::Scene::TouchPropagationType propagationType)
  33 {
  34   Internal::Stage& stageImpl = GetImplementation(stage);
  35   return Internal::HitTestAlgorithm::HitTest(stageImpl.GetSize(), stageImpl.GetRenderTaskList(), stageImpl.GetLayerList(), screenCoordinates, results, func, propagationType);
  36 }
  37
  38 bool BuildPickingRay(RenderTask renderTask, const Vector2& screenCoordinates, Vector3& origin, Vector3& direction)
  39 {
  40   Internal::RenderTask& renderTaskImpl             = GetImplementation(renderTask);
  41   Vector2               convertedScreenCoordinates = screenCoordinates;
  42
  43   if(!renderTaskImpl.IsHittable(convertedScreenCoordinates))
  44   {
  45     return false;
  46   }
  47
  48   Viewport viewport;
  49   renderTaskImpl.GetHittableViewport(viewport);
  50   if(convertedScreenCoordinates.x < static_cast<float>(viewport.x) ||
  51      convertedScreenCoordinates.x > static_cast<float>(viewport.x + viewport.width) ||
  52      convertedScreenCoordinates.y < static_cast<float>(viewport.y) ||
  53      convertedScreenCoordinates.y > static_cast<float>(viewport.y + viewport.height))
  54   {
  55     // The screen coordinate is outside the viewport of render task. The viewport clips all layers.
  56     return false;
  57   }
  58   DALI_ASSERT_ALWAYS(renderTaskImpl.GetCameraActor());
  59
  60   Internal::CameraActor& cameraActorImpl = *renderTaskImpl.GetCameraActor();
  61   Vector4                rayOrigin;
  62   Vector4                rayDirection;
  63   bool                   success = cameraActorImpl.BuildPickingRay(convertedScreenCoordinates, viewport, rayOrigin, rayDirection);
  64   if(success)
  65   {
  66     origin    = Vector3(rayOrigin.x, rayOrigin.y, rayOrigin.z);
  67     direction = Vector3(rayDirection.x, rayDirection.y, rayDirection.z);
  68   }
  69   return success;
  70 }
  71
  72 } // namespace HitTestAlgorithm
  73
  74 } // namespace Dali