Utils.hpp

#ifndef _UTILS_HPP
#define _UTILS_HPP

#include <sifteo/math.h>

static Side oppositeSide(Side s)
{
	switch(s)
	{
		case TOP: return BOTTOM;
		case RIGHT: return LEFT;
		case BOTTOM: return TOP;
		case LEFT: return RIGHT;
		default: return TOP;
	}
}

static Float2 sideDirection(Side s)
{
	Float2 d;
	switch(s)
	{
		case TOP: d.set(0, -1); break;
		case RIGHT: d.set(1, 0); break;
		case BOTTOM: d.set(0, 1); break;
		case LEFT: d.set(-1, 0); break;
		default: break;
	}
	return d;
}

static Float2 getSidePos(Side s)
{
	Float2 p;
	p.set(64, 64);
	p += sideDirection(s)*64;
	return p;
}

static Float2 rot90CCW(Float2 d)
{
	Float2 r;
	r.set( -d.y, d.x );
	return r;
}

static Float2 rot90CW(Float2 d)
{
	Float2 r;
	r.set( d.y, -d.x );
	return r;
}

static Float2 toSpritePos( Float2 p, const AssetImage& img, bool doClamp = false )
{
	p.x -= img.pixelWidth()/2.0;
	p.y -= img.pixelHeight()/2.0;

	if( doClamp )
	{
		p.x = clamp( p.x, 0.0f, 128.0f-img.pixelWidth() );
		p.y = clamp( p.y, 0.0f, 128.0f-img.pixelHeight() );
	}

	return p;
}

static Float2 clampPos( Float2 p )
{
	p.x = clamp(p.x, 0.0f, 128.0f);
	p.y = clamp(p.y, 0.0f, 128.0f);
	return p;
}


#endif