diff --git a/examples/image-view-svg/image-view-svg-example.cpp b/examples/image-view-svg/image-view-svg-example.cpp index 62cde6e..13ba31d 100644 --- a/examples/image-view-svg/image-view-svg-example.cpp +++ b/examples/image-view-svg/image-view-svg-example.cpp @@ -1,5 +1,5 @@ /* - * Copyright (c) 2017 Samsung Electronics Co., Ltd. + * Copyright (c) 2018 Samsung Electronics Co., Ltd. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. @@ -23,6 +23,7 @@ using namespace Dali; namespace { +const float MIN_SCALE = 0.6f; const float MAX_SCALE = 6.f; const char* SVG_IMAGES[] = @@ -37,9 +38,10 @@ const char* SVG_IMAGES[] = DEMO_IMAGE_DIR "Kid1.svg" }; const unsigned int NUM_SVG_IMAGES( sizeof( SVG_IMAGES ) / sizeof( SVG_IMAGES[0] ) ); -} +const unsigned int NUM_IMAGES_DISPLAYED = 4u; +} // unnamed namespace -// This example shows how to display svg images with ImageView +// This example shows how to display svg images with ImageView. // class ImageSvgController : public ConnectionTracker { @@ -48,7 +50,6 @@ public: ImageSvgController( Application& application ) : mApplication( application ), mScale( 1.f ), - mScaleAtPinchStart( 1.0f ), mIndex( 0 ) { // Connect to the Application's Init signal @@ -97,7 +98,7 @@ public: resetButton.ClickedSignal().Connect( this, &ImageSvgController::OnResetButtonClicked ); // Create and put imageViews to stage - for( unsigned int i=0; i<4u; i++) + for( unsigned int i = 0; i < NUM_IMAGES_DISPLAYED; i++ ) { mSvgActor[i] = Toolkit::ImageView::New(SVG_IMAGES[mIndex+i]); mSvgActor[i].SetSize( mActorSize ); @@ -130,8 +131,8 @@ public: // Callback of push button, for changing image set bool OnChangeButtonClicked( Toolkit::Button button ) { - mIndex = (mIndex+4) % NUM_SVG_IMAGES; - for( unsigned int i=0; i<4u; i++) + mIndex = ( mIndex + NUM_IMAGES_DISPLAYED ) % NUM_SVG_IMAGES; + for( unsigned int i = 0; i < NUM_IMAGES_DISPLAYED; i++ ) { mSvgActor[i].SetImage(SVG_IMAGES[mIndex+i]); } @@ -142,7 +143,7 @@ public: // Callback of push button, for resetting image size and position bool OnResetButtonClicked( Toolkit::Button button ) { - for( unsigned int i=0; i<4u; i++) + for( unsigned int i = 0; i < NUM_IMAGES_DISPLAYED ; i++ ) { mSvgActor[i].SetSize(mActorSize); mSvgActor[i].SetPosition( Vector3::ZERO ); @@ -157,7 +158,7 @@ public: { if( gesture.state == Gesture::Continuing ) { - for( unsigned int i=0; i<4u; i++) + for( unsigned int i = 0; i < NUM_IMAGES_DISPLAYED; i++ ) { mSvgActor[i].TranslateBy(Vector3(gesture.displacement)); } @@ -167,18 +168,42 @@ public: // Callback of pinch gesture, for resizing the actors void OnPinch(Actor actor, const PinchGesture& gesture) { - if (gesture.state == Gesture::Started) - { - mScaleAtPinchStart = mScale; - } - if( gesture.state == Gesture::Finished ) + switch( gesture.state ) { - mScale = mScaleAtPinchStart * gesture.scale; - mScale = mScale > MAX_SCALE ? MAX_SCALE : mScale; - for( unsigned int i=0; i<4u; i++) + // Only scale the image when we start or continue pinching + + case Gesture::Started: + case Gesture::Continuing: + { + float scale = std::max( gesture.scale, MIN_SCALE / mScale ); + scale = std::min( MAX_SCALE / mScale, scale ); + + for( unsigned int i = 0; i < NUM_IMAGES_DISPLAYED; i++ ) + { + mSvgActor[i].SetScale( scale ); + } + break; + } + + case Gesture::Finished: { - mSvgActor[i].SetSize( mActorSize * mScale); + // Resize the image when pinching is complete, this will rasterize the SVG to the new size + + mScale = mScale * gesture.scale; + mScale = mScale > MAX_SCALE ? MAX_SCALE : mScale; + mScale = mScale < MIN_SCALE ? MIN_SCALE : mScale; + for( unsigned int i = 0; i < NUM_IMAGES_DISPLAYED; i++ ) + { + mSvgActor[i].SetSize( mActorSize * mScale ); + mSvgActor[i].SetScale( 1.0f ); + } + break; } + + case Gesture::Cancelled: + case Gesture::Clear: + case Gesture::Possible: + break; } } @@ -198,10 +223,13 @@ public: const char* keyName = event.keyPressedName.c_str(); if( strcmp(keyName, "Left") == 0 ) { - mScale /= 1.1f; - for( unsigned int i=0; i<4u; i++) + if( mScale > MIN_SCALE ) + { + mScale /= 1.1f; + } + for( unsigned int i = 0; i < NUM_IMAGES_DISPLAYED; i++ ) { - mSvgActor[i].SetSize( mActorSize * mScale); + mSvgActor[i].SetSize( mActorSize * mScale ); } } else if( strcmp(keyName, "Right") == 0 ) @@ -210,9 +238,9 @@ public: { mScale *= 1.1f; } - for( unsigned int i=0; i<4u; i++) + for( unsigned int i = 0; i < NUM_IMAGES_DISPLAYED; i++ ) { - mSvgActor[i].SetSize( mActorSize * mScale); + mSvgActor[i].SetSize( mActorSize * mScale ); } } } @@ -228,7 +256,6 @@ private: Toolkit::ImageView mSvgActor[4]; Vector2 mActorSize; float mScale; - float mScaleAtPinchStart; unsigned int mIndex; };