xmario/xSDL/xSpriteGroup.cpp

#include "xSpriteGroup.h"

/** clean SDL objects */
xSpriteGroup::~xSpriteGroup(){
	_mutex.lock();
	_sprites.clear();
	_mutex.unlock();
}

/** default constructor */
xSpriteGroup::xSpriteGroup(){
}

/** adds a sprite to the group */
void xSpriteGroup::add(xSprite* sprite){
	_mutex.lock();
	_sprites.insert(sprite);
	_mutex.unlock();
}

/** removes a sprite from the group */
void xSpriteGroup::remove(xSprite* sprite){
	_mutex.lock();
	_sprites.erase(sprite);
	_mutex.unlock();
}

/** set relative move for each sprite */
void xSpriteGroup::displace(int x, int y, int w, int h){
	_mutex.lock();
	_displace.x = x;
	_displace.y = y;
	_displace.w = w;
	_displace.h = h;
	_mutex.unlock();
}
/** set relative move for each sprite */
void xSpriteGroup::displace(SDL_Rect displace){
	_mutex.lock();
	_displace = displace;
	_mutex.unlock();
}

/** draws to renderer */
void xSpriteGroup::draw(SDL_Renderer* renderer){
	_mutex.lock();

	// only draw active sprite if animated
	if( _animated ){
		set<xSprite*>::iterator at_index = _sprites.begin();
		advance(at_index, _active_sprite);
		if( at_index == _sprites.end() ){
			_mutex.unlock();
			return;
		}
		draw_sprite(renderer, *at_index);
		_mutex.unlock();
		return;
	}

	// else draw every sprite
	set<xSprite*>::iterator it;
	for( it = _sprites.begin() ; it != _sprites.end() ; it++ ){
		draw_sprite(renderer, *it);
	}
	_mutex.unlock();
}

/** animation process */
void xSpriteGroup::tick(const uint32_t ticks){
	_mutex.lock();
	const uint32_t time_index  = ticks / _animation_interval;
	_active_sprite = time_index % _sprites.size();
	_mutex.unlock();
}

/** orchestrate the animation */
void xSpriteGroup::animate(uint32_t interval){
	_mutex.lock();
	_animated = true;
	_animation_interval = interval;
	xApplication::get()->addOrchestrable(this);
	_mutex.unlock();
}

/** stops orchestrating the animation */
void xSpriteGroup::freeze(){
	_mutex.lock();
	xApplication::get()->removeOrchestrable(this);
	_mutex.unlock();
}



/* draws a sprite using the relative displace */
void xSpriteGroup::draw_sprite(SDL_Renderer* renderer, xSprite* sprite) {
	const SDL_Rect projection = sprite->projection();
	const SDL_Rect clip       = sprite->clip();

	// displace sprite projection with group move
	const SDL_Rect displace {
		projection.x + _displace.x,
		projection.y + _displace.y,
		projection.w + _displace.w,
		projection.h + _displace.h
	};

	SDL_RenderCopy(
		renderer,
		SDL_CreateTextureFromSurface(renderer, sprite->surface()),
		&clip,
		&displace
	);
}