examples/bubble-effect/bubble-effect-example.cpp

   1 /*
   2  * Copyright (c) 2014 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 #include <dali/dali.h>
  19 #include <dali-toolkit/dali-toolkit.h>
  20 #include "shared/view.h"
  21
  22 using namespace Dali;
  23
  24 namespace
  25 {
  26 const char * const TOOLBAR_IMAGE( DALI_IMAGE_DIR "top-bar.png" );
  27 const char * const APPLICATION_TITLE( "Bubble Effect" );
  28 const char * const CHANGE_BACKGROUND_ICON( DALI_IMAGE_DIR "icon-change.png" );
  29 const char * const CHANGE_BUBBLE_SHAPE_ICON( DALI_IMAGE_DIR "icon-replace.png" );
  30
  31 const char* BACKGROUND_IMAGES[]=
  32 {
  33   DALI_IMAGE_DIR "background-1.jpg",
  34   DALI_IMAGE_DIR "background-2.jpg",
  35   DALI_IMAGE_DIR "background-3.jpg",
  36   DALI_IMAGE_DIR "background-4.jpg",
  37   DALI_IMAGE_DIR "background-5.jpg",
  38 };
  39 const unsigned int NUM_BACKGROUND_IMAGES( sizeof( BACKGROUND_IMAGES ) / sizeof( BACKGROUND_IMAGES[0] ) );
  40
  41 const char* BUBBLE_SHAPE_IMAGES[] =
  42 {
  43   DALI_IMAGE_DIR "bubble-ball.png",
  44   DALI_IMAGE_DIR "icon-effect-cross.png",
  45   DALI_IMAGE_DIR "icon-item-view-layout-spiral.png",
  46   DALI_IMAGE_DIR "icon-replace.png"
  47 };
  48 const unsigned int NUM_BUBBLE_SHAPE_IMAGES( sizeof( BUBBLE_SHAPE_IMAGES ) / sizeof( BUBBLE_SHAPE_IMAGES[0] ) );
  49
  50 const Vector2 DEFAULT_BUBBLE_SIZE( 10.f, 30.f );
  51 const unsigned int DEFAULT_NUMBER_OF_BUBBLES( 1000 );
  52
  53 /**
  54  * @brief Load an image, scaled-down to no more than the stage dimensions.
  55  *
  56  * Uses image scaling mode FittingMode::SCALE_TO_FILL to resize the image at
  57  * load time to cover the entire stage with pixels with no borders,
  58  * and filter mode BOX_THEN_LINEAR to sample the image with
  59  * maximum quality.
  60  */
  61 ResourceImage LoadStageFillingImage( const char * const imagePath )
  62 {
  63   Size stageSize = Stage::GetCurrent().GetSize();
  64   return ResourceImage::New( imagePath, Dali::ImageDimensions( stageSize.x, stageSize.y ), Dali::FittingMode::SCALE_TO_FILL, Dali::SamplingMode::BOX_THEN_LINEAR );
  65 }
  66
  67 }// end LOCAL_STUFF
  68
  69 // This example shows the usage of BubbleEmitter which displays lots of moving bubbles on the stage.
  70 class BubbleEffectExample : public ConnectionTracker
  71 {
  72 public:
  73   BubbleEffectExample(Application &app)
  74   : mApp(app),
  75     mHSVDelta( Vector3( 0.f, 0.f, 0.5f ) ),
  76     mTimerInterval( 16 ),
  77     mCurrentBackgroundImageId( 0 ),
  78     mCurrentBubbleShapeImageId( 0 ),
  79     mNeedNewAnimation( true )
  80   {
  81     // Connect to the Application's Init signal
  82     app.InitSignal().Connect(this, &BubbleEffectExample::Create);
  83   }
  84
  85   ~BubbleEffectExample()
  86   {
  87   }
  88
  89 private:
  90
  91   // The Init signal is received once (only) during the Application lifetime
  92   void Create(Application& app)
  93   {
  94     DemoHelper::RequestThemeChange();
  95
  96     Stage stage = Stage::GetCurrent();
  97     Vector2 stageSize = stage.GetSize();
  98
  99     stage.KeyEventSignal().Connect(this, &BubbleEffectExample::OnKeyEvent);
 100
 101     // Creates a default view with a default tool bar.
 102     // The view is added to the stage.
 103     Toolkit::ToolBar toolBar;
 104     Toolkit::Control    view;
 105     Layer content = DemoHelper::CreateView( app,
 106                                             view,
 107                                             toolBar,
 108                                             "",
 109                                             TOOLBAR_IMAGE,
 110                                             APPLICATION_TITLE );
 111
 112     // Add a button to change background. (right of toolbar)
 113     mChangeBackgroundButton = Toolkit::PushButton::New();
 114     mChangeBackgroundButton.SetBackgroundImage( ResourceImage::New( CHANGE_BACKGROUND_ICON ) );
 115     mChangeBackgroundButton.ClickedSignal().Connect( this, &BubbleEffectExample::OnChangeIconClicked );
 116     toolBar.AddControl( mChangeBackgroundButton,
 117                         DemoHelper::DEFAULT_VIEW_STYLE.mToolBarButtonPercentage,
 118                         Toolkit::Alignment::HorizontalRight,
 119                         DemoHelper::DEFAULT_MODE_SWITCH_PADDING  );
 120     // Add a button to change bubble shape. ( left of bar )
 121     mChangeBubbleShapeButton = Toolkit::PushButton::New();
 122     mChangeBubbleShapeButton.SetBackgroundImage( ResourceImage::New( CHANGE_BUBBLE_SHAPE_ICON ) );
 123     mChangeBubbleShapeButton.ClickedSignal().Connect( this, &BubbleEffectExample::OnChangeIconClicked );
 124     toolBar.AddControl( mChangeBubbleShapeButton,
 125                         DemoHelper::DEFAULT_VIEW_STYLE.mToolBarButtonPercentage,
 126                         Toolkit::Alignment::HorizontalLeft,
 127                         DemoHelper::DEFAULT_MODE_SWITCH_PADDING  );
 128
 129     // Create and initialize the BubbleEmitter object
 130     mBubbleEmitter = Toolkit::BubbleEmitter::New( stageSize,
 131                                                   ResourceImage::New( BUBBLE_SHAPE_IMAGES[mCurrentBubbleShapeImageId] ),
 132                                                   DEFAULT_NUMBER_OF_BUBBLES,
 133                                                   DEFAULT_BUBBLE_SIZE);
 134     mBackgroundImage = LoadStageFillingImage( BACKGROUND_IMAGES[mCurrentBackgroundImageId] );
 135     mBubbleEmitter.SetBackground( mBackgroundImage, mHSVDelta );
 136
 137     // Get the root actor of all bubbles, and add it to stage.
 138     Actor bubbleRoot = mBubbleEmitter.GetRootActor();
 139     bubbleRoot.SetParentOrigin(ParentOrigin::CENTER);
 140     bubbleRoot.SetZ(0.1f); // Make sure the bubbles displayed on top og the background.
 141     content.Add( bubbleRoot );
 142
 143     // Add the background image actor to stage
 144     mBackgroundActor = ImageActor::New( mBackgroundImage );
 145     mBackgroundActor.SetParentOrigin( ParentOrigin::CENTER );
 146     content.Add(mBackgroundActor);
 147
 148     // Set up the timer to emit bubble regularly when the finger is touched down but not moved
 149     mTimerForBubbleEmission = Timer::New( mTimerInterval );
 150     mTimerForBubbleEmission.TickSignal().Connect(this, &BubbleEffectExample::OnTimerTick);
 151
 152     // Connect the callback to the touch signal on the background
 153      mBackgroundActor.TouchedSignal().Connect( this, &BubbleEffectExample::OnTouch );
 154   }
 155
 156
 157 /***********
 158  * Emit bubbles
 159  *****************/
 160
 161   // Set up the animation of emitting bubbles, to be efficient, every animation controls multiple emission ( 4 here )
 162   void SetUpAnimation( Vector2 emitPosition, Vector2 direction )
 163   {
 164     if( mNeedNewAnimation )
 165     {
 166       float duration = Random::Range(1.f, 1.5f);
 167       mEmitAnimation = Animation::New( duration );
 168       mNeedNewAnimation = false;
 169       mAnimateComponentCount = 0;
 170     }
 171
 172     mBubbleEmitter.EmitBubble( mEmitAnimation, emitPosition, direction + Vector2(0.f, 30.f) /* upwards */, Vector2(300, 600) );
 173
 174     mAnimateComponentCount++;
 175
 176     if( mAnimateComponentCount % 4 ==0 )
 177     {
 178       mEmitAnimation.Play();
 179       mNeedNewAnimation = true;
 180     }
 181   }
 182
 183   // Emit bubbles when the finger touches down but keep stationary.
 184   // And stops emitting new bubble after being stationary for 2 seconds
 185   bool OnTimerTick()
 186   {
 187     if(mEmitPosition == mCurrentTouchPosition) // finger is not moving
 188     {
 189       mNonMovementCount++;
 190       if(mNonMovementCount < (1000 / mTimerInterval)) // 1 seconds
 191       {
 192         for(int i = 0; i < 4; i++) // emit 4 bubbles every timer tick
 193         {
 194           SetUpAnimation( mCurrentTouchPosition+Vector2(rand()%5, rand()%5), Vector2(rand()%60-30, rand()%100-50) );
 195         }
 196       }
 197     }
 198     else
 199     {
 200       mNonMovementCount = 0;
 201       mEmitPosition = mCurrentTouchPosition;
 202     }
 203
 204     return true;
 205   }
 206
 207   // Callback function of the touch signal on the background
 208   bool OnTouch(Dali::Actor actor, const Dali::TouchEvent& event)
 209   {
 210     const TouchPoint &point = event.GetPoint(0);
 211     switch(point.state)
 212     {
 213       case TouchPoint::Down:
 214       {
 215         mCurrentTouchPosition = point.screen;
 216         mEmitPosition = point.screen;
 217         mTimerForBubbleEmission.Start();
 218         mNonMovementCount = 0;
 219
 220         break;
 221       }
 222       case TouchPoint::Motion:
 223       {
 224         Vector2 displacement = point.screen - mCurrentTouchPosition;
 225         mCurrentTouchPosition = point.screen;
 226         //emit multiple bubbles along the moving direction when the finger moves quickly
 227         float step = std::min(5.f, displacement.Length());
 228         for( float i=0.25f; i<step; i=i+1.f)
 229         {
 230           SetUpAnimation( mCurrentTouchPosition+displacement*(i/step), displacement );
 231         }
 232         break;
 233       }
 234       case TouchPoint::Up:
 235       case TouchPoint::Leave:
 236       case TouchPoint::Interrupted:
 237       {
 238         mTimerForBubbleEmission.Stop();
 239         mEmitAnimation.Play();
 240         mNeedNewAnimation = true;
 241         mAnimateComponentCount = 0;
 242         break;
 243       }
 244       case TouchPoint::Stationary:
 245       case TouchPoint::Last:
 246       default:
 247       {
 248         break;
 249       }
 250
 251     }
 252     return true;
 253   }
 254
 255   bool OnChangeIconClicked( Toolkit::Button button )
 256   {
 257     if(button == mChangeBackgroundButton)
 258     {
 259       mBackgroundImage = LoadStageFillingImage( BACKGROUND_IMAGES[ ++mCurrentBackgroundImageId % NUM_BACKGROUND_IMAGES  ] );
 260
 261       mBubbleEmitter.SetBackground( mBackgroundImage, mHSVDelta );
 262
 263       mBackgroundActor.SetImage( mBackgroundImage );
 264     }
 265     else if( button == mChangeBubbleShapeButton )
 266     {
 267       mBubbleEmitter.SetShapeImage( ResourceImage::New( BUBBLE_SHAPE_IMAGES[ ++mCurrentBubbleShapeImageId % NUM_BUBBLE_SHAPE_IMAGES ] ) );
 268     }
 269     return true;
 270   }
 271
 272   /**
 273    * Main key event handler
 274    */
 275   void OnKeyEvent(const KeyEvent& event)
 276   {
 277     if(event.state == KeyEvent::Down)
 278     {
 279       if( IsKey( event, Dali::DALI_KEY_ESCAPE) || IsKey( event, Dali::DALI_KEY_BACK) )
 280       {
 281         mApp.Quit();
 282       }
 283     }
 284   }
 285
 286 private:
 287
 288   Application&               mApp;
 289   Image                      mBackgroundImage;
 290   ImageActor                 mBackgroundActor;
 291
 292   Toolkit::BubbleEmitter     mBubbleEmitter;
 293   Animation                  mEmitAnimation;
 294   Toolkit::PushButton        mChangeBackgroundButton;
 295   Toolkit::PushButton        mChangeBubbleShapeButton;
 296   Timer                      mTimerForBubbleEmission;
 297
 298   Vector3                    mHSVDelta;
 299   Vector2                    mCurrentTouchPosition;
 300   Vector2                    mEmitPosition;
 301
 302   unsigned int               mAnimateComponentCount;
 303   unsigned int               mNonMovementCount;
 304   unsigned int               mTimerInterval;
 305   unsigned int               mCurrentBackgroundImageId;
 306   unsigned int               mCurrentBubbleShapeImageId;
 307
 308   bool                       mNeedNewAnimation;
 309 };
 310
 311 /*****************************************************************************/
 312
 313 static void
 314 RunTest(Application& app)
 315 {
 316   BubbleEffectExample theApp(app);
 317   app.MainLoop();
 318 }
 319
 320 /*****************************************************************************/
 321
 322 int
 323 main(int argc, char **argv)
 324 {
 325   Application app = Application::New(&argc, &argv);
 326
 327   RunTest(app);
 328
 329   return 0;
 330 }
 331
 332
 333