caret.cpp

// handle carets; a simplified type of objects used for visual effects.
// carets have no interaction with real objects, and are always drawn
// on top of all other objects and in front even of map foreground tiles.

#include "nx.h"
#include <math.h>
#include "common/llist.h"
#include "caret.fdh"

Caret *firstcaret = NULL;
Caret *lastcaret = NULL;
static int _effecttype = EFFECT_NONE;


bool Carets::init(void)
{
	firstcaret = NULL;
	lastcaret = NULL;
	return 0;
}

void Carets::close(void)
{
	Carets::DestroyAll();
}

/*
void c------------------------------() {}
*/

Caret *CreateCaret(int x, int y, int sprite, void (*ontick)(Caret *c), \
				   int xinertia, int yinertia)
{
	Caret *c = new Caret;
	memset(c, 0, sizeof(Caret));
	
	c->x = x;
	c->y = y;
	c->xinertia = xinertia;
	c->yinertia = yinertia;
	c->sprite = sprite;
	c->OnTick = ontick;
	c->effecttype = _effecttype;
	
	LL_ADD_END(c, prev, next, firstcaret, lastcaret);
	return c;
}

void Caret::Delete()
{
	this->deleted = true;
}

void Caret::Destroy()
{
	LL_REMOVE(this, prev, next, firstcaret, lastcaret);
	delete this;
}

void Caret::MoveAtDir(int dir, int speed)
{
	this->xinertia = 0;
	this->yinertia = 0;
	
	switch(dir)
	{
		case LEFT:  this->xinertia = -speed; break;
		case RIGHT: this->xinertia = speed; break;
		case UP:	this->yinertia = -speed; break;
		case DOWN:  this->yinertia = speed; break;
	}
}

/*
void c------------------------------() {}
*/

void Carets::DrawAll(void)
{
Caret *c = firstcaret;
Caret *next;
int scr_x, scr_y;

	while(c)
	{
		next = c->next;
		
		if (c->deleted)
		{
			c->Destroy();
		}
		else
		{
			// do caret ai
			(*c->OnTick)(c);
			
			// move caret
			c->x += c->xinertia;
			c->y += c->yinertia;
			
			// get caret's onscreen position
			// since caret's are all short-lived we just assume it's still onscreen
			// and let SDL's clipping handle it if not.
			if (!c->invisible && !c->deleted)	// must check deleted again in case handler_function set it
			{
				scr_x = (c->x >> CSF) - (map.displayed_xscroll >> CSF);
				scr_y = (c->y >> CSF) - (map.displayed_yscroll >> CSF);
				scr_x -= sprites[c->sprite].frame[c->frame].dir[0].drawpoint.x;
				scr_y -= sprites[c->sprite].frame[c->frame].dir[0].drawpoint.y;
				
				draw_sprite(scr_x, scr_y, c->sprite, c->frame, RIGHT);
			}
		}
		
		c = next;
	}
}

int Carets::CountByEffectType(int type)
{
	int count = 0;
	Caret *c = firstcaret;
	while(c)
	{
		if (c->effecttype == type) count++;
		c = c->next;
	}
	
	return count;
}

int Carets::DeleteByEffectType(int type)
{
	int count = 0;
	Caret *c = firstcaret;
	while(c)
	{
		if (c->effecttype == type) c->Delete();
		c = c->next;
	}
	
	return count;
}

void Carets::DestroyAll(void)
{
	while(firstcaret)
		firstcaret->Destroy();
}

/*
void c------------------------------() {}
*/

// generates a caret-based effect at x, y. Most sprites used for carets have the
// drawpoint at their center so the effect is generally centered at that position.
//
// an effect can be just a convenience function for creating a caret
// with a particular sprite/ai combo, or it can produce a group of carets
// which are always seen together (e.g. bonkplus or bloodspatter).
Caret *effect(int x, int y, int effectno)
{
Caret *c;
int i;

	// tell CreateCaret what kind of effect we're spawning
	_effecttype = effectno;
	
	switch(effectno)
	{
		case EFFECT_STARSOLID:	  c = CreateCaret(x, y, SPR_STAR_SOLID, caret_animate3); break;
		case EFFECT_STARPOOF:	  c = CreateCaret(x, y, SPR_STAR_POOF, caret_animate3); break;
		case EFFECT_FISHY: 		  c = CreateCaret(x, y, SPR_FISHY, caret_fishy); break;
		case EFFECT_BOOMFLASH:	  c = CreateCaret(x, y, SPR_BOOMFLASH, caret_animate3); break;
		case EFFECT_BUBBLE_BURST: c = CreateCaret(x, y, SPR_BUBBLE_BURST, caret_animate3); break;
		case EFFECT_SPUR_HIT: 	  c = CreateCaret(x, y, SPR_SPUR_HIT, caret_spur_hit); break;
		case EFFECT_ZZZZ: 		  c = CreateCaret(x, y, SPR_ZZZZ, caret_zzzz); break;
		case EFFECT_LEVELUP:	  c = CreateCaret(x, y, SPR_LEVELUP, caret_playertext); break;
		case EFFECT_LEVELDOWN: 	  c = CreateCaret(x, y, SPR_LEVELDOWN, caret_playertext); break;
		case EFFECT_BONUSFLASH:	  c = CreateCaret(x, y, SPR_SMOKE_CLOUD, caret_bonusflash); break;
		case EFFECT_HEY: 		  c = CreateCaret(x, y, SPR_HEY, caret_hey); break;
		case EFFECT_EMPTY:		  c = CreateCaret(x, y, SPR_EMPTY, caret_playertext); break;
		case EFFECT_SMOKETRAIL:	  c = CreateCaret(x, y, SPR_SMOKETRAIL, caret_animate2); break;
		
		case EFFECT_SMOKETRAIL_SLOW:
			c = CreateCaret(x, y, SPR_SMOKETRAIL, caret_animate3);
		break;
		
		case EFFECT_GUNFISH_BUBBLE:
		{
			c = CreateCaret(x-(3<<CSF), y-(3<<CSF), SPR_GUNFISH_BUBBLE, caret_gunfish_bubble); break;
		}
		break;
		
		case EFFECT_LAVA_SPLASH:
		{
			c = CreateCaret(x-(3<<CSF), y-(3<<CSF), SPR_LAVA_DRIP_SPLASH, caret_gunfish_bubble); break;
		}
		break;
		
		case EFFECT_GHOST_SPARKLE:
		{
			c = CreateCaret(x, y, SPR_GHOST_SPARKLE, caret_ghost_sparkle);
			c->yinertia = random(-0x600, -0x200);
		}
		break;
		
		// "blood" spatters from shot hitting enemy
		case EFFECT_BLOODSPLATTER:
		{
			for(i=0;i<3;i++)
			{
				c = CreateCaret(x, y, SPR_BLOODHIT, caret_animate3);
				vector_from_angle(random(0, 255), (2<<CSF), &c->xinertia, &c->yinertia);
			}
		}
		break;
		
		// two little blinky stars when player bonks his head on the ceiling
		case EFFECT_BONKPLUS:
		{
			for(i=0;i<2;i++)
			{
				c = CreateCaret(x, y, SPR_BONKHEADPLUS, caret_bonkplus);
				
				c->xinertia = random(-0x600, 0x600);
				c->yinertia = random(-0x200, 0x200);
				//uint8_t angle = random(-14, 14);
				//if (random(0, 1)) angle += 128;
				//vector_from_angle(angle, random(0x200, 0x384), &c->xinertia, &c->yinertia);
			}
		}
		break;
		
		case EFFECT_QMARK:
		{
			// only 1 question mark is ever shown at a time
			DeleteEffectsOfType(EFFECT_QMARK);
			c = CreateCaret(x, y, SPR_QMARK, caret_qmark);
		}
		break;
		
		default:
			staterr("effect: invalid effect type %d", effectno);
			return NULL;
	}
	
	_effecttype = EFFECT_NONE;
	return c;
}

/*
void c------------------------------() {}
*/

void caret_animate1(Caret *c)
{
	c->animdie(0);
}

void caret_animate2(Caret *c)
{
	c->animdie(1);
}

void caret_animate3(Caret *c)
{
	c->animdie(2);
}

void Caret::anim(int speed)
{
Caret * const &c = this;

	if (++c->animtimer > speed)
	{
		c->animtimer = 0;
		
		if (++c->frame >= sprites[c->sprite].nframes)
			c->frame = 0;
	}
}

void Caret::animdie(int speed)
{
Caret * const &c = this;

	if (++c->animtimer > speed)
	{
		c->animtimer = 0;
		
		if (++c->frame >= sprites[c->sprite].nframes)
			c->Delete();
	}
}

/*
void c------------------------------() {}
*/

// flickers rapidly and decels at exponential speed.
// used for the "bonkplus" effect when you bonk your head
void caret_bonkplus(Caret *c)
{
	c->xinertia *= 4; c->xinertia /= 5;
	c->yinertia *= 4; c->yinertia /= 5;
	
	c->invisible = (++c->timer & 2);
	
	if (c->timer > 20)
		c->Delete();
}


void caret_fishy(Caret *c)
{
	c->yinertia -= 16;
	c->animdie(4);
}


void caret_spur_hit(Caret *c)
{
	c->timer++;
	c->frame = (c->timer / 2) % 3;
	
	if (c->timer > 24)
		c->Delete();
}


// "Level Up", "Level Down", and "Empty" texts
void caret_playertext(Caret *c)
{
int spd, stop;

	c->anim(1);
	
	// "EMPTY" text goes twice as fast as "Level" text
	if (c->sprite == SPR_EMPTY)
	{
		spd = 2;
		stop = 18;
	}
	else
	{
		spd = 1;
		stop = 20;
	}
	
	c->timer += spd;
	if (c->timer < 80)
	{
		if (c->timer < stop)
		{
			c->y -= (spd << CSF);
		}
	}
	else
	{
		c->Delete();
	}
}


// ? effect when you press down with no object around to activate
void caret_qmark(Caret *c)
{
	if (++c->timer < 40)
	{
		if (c->timer < 7)
		{
			c->y -= (3 << CSF);
		}
	}
	else
	{
		c->Delete();
	}
}


void caret_bonusflash(Caret *c)
{
	if (++c->timer == 4)
		c->Delete();
}


void caret_hey(Caret *c)
{
	if (++c->timer > 30) c->Delete();
	if (c->timer < 5) c->y -= (1<<CSF);
}


void caret_gunfish_bubble(Caret *c)
{
	c->animdie(5);
	
	c->yinertia += 0x40;
	if (c->yinertia >= 0x5ff) c->yinertia = 0x5ff;
}


void caret_ghost_sparkle(Caret *c)
{
	c->invisible = (++c->timer & 2);
	
	if (c->timer > 20)
		c->Delete();
}


void caret_zzzz(Caret *c)
{
	c->animdie(5);
	
	c->x += 0x80;
	c->y -= 0x80;
}