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#include "simulation\Element.h"
/* TRON element is meant to resemble a tron bike (or worm) moving around and trying to avoid obstacles itself.
* It has four direction each turn to choose from, 0 (left) 1 (up) 2 (right) 3 (down).
* Each turn has a small random chance to randomly turn one way (so it doesn't do the exact same thing in a large room)
* If the place it wants to move isn't a barrier, it will try and 'see' infront of itself to determine its safety.
* For now the tron can only see its own body length in pixels ahead of itself (and around corners)
* - - - - - - - - - -
* - - - - + - - - - -
* - - - + + + - - - -
* - - +<--+-->+ - - -
* - +<----+---->+ - -
* - - - - H - - - - -
* Where H is the head with tail length 4, it checks the + area to see if it can hit any of the edges, then it is called safe, or picks the biggest area if none safe.
* .tmp bit values: 0 tail , 1 head , 2 no tail growth , 4-8 is direction , 16 is wait flag
* .tmp2 is tail length (gets longer every few hundred frames)
* .life is the timer that kills the end of the tail (the head uses life for how often it grows longer)
*/
#define TRON_HEAD 1
#define TRON_NOGROW 2
#define TRON_WAIT 16 //it was just created, so WAIT a frame
#define TRON_NODIE 32
int tron_rx[4] = {-1, 0, 1, 0};
int tron_ry[4] = { 0,-1, 0, 1};
int new_tronhead(Simulation * sim, int x, int y, int i, int direction)
{
int np = sim->create_part(-1, x , y ,PT_TRON);
if (np==-1)
return -1;
if (sim->parts[i].life >= 100) // increase tail length
{
sim->parts[i].tmp2++;
sim->parts[i].life = 5;
}
//give new head our properties
sim->parts[np].tmp = 1 | direction<<2 | sim->parts[i].tmp&(TRON_NOGROW|TRON_NODIE);
if (np > i)
sim->parts[np].tmp |= TRON_WAIT;
sim->parts[np].tmp2 = sim->parts[i].tmp2;
sim->parts[np].life = sim->parts[i].life + 2;
sim->parts[np].dcolour = sim->parts[i].dcolour;
return 1;
}
int trymovetron(Simulation * sim, int x, int y, int dir, int i, int len)
{
int k,j,r,rx,ry,tx,ty,count;
count = 0;
rx = x;
ry = y;
for (k = 1; k <= len; k ++)
{
rx += tron_rx[dir];
ry += tron_ry[dir];
r = sim->pmap[ry][rx];
if (!r && !sim->bmap[(ry)/CELL][(rx)/CELL] && ry > CELL && rx > CELL && ry < YRES-CELL && rx < XRES-CELL)
{
count++;
for (tx = rx - tron_ry[dir] , ty = ry - tron_rx[dir], j=1; abs(tx-rx) < (len-k) && abs(ty-ry) < (len-k); tx-=tron_ry[dir],ty-=tron_rx[dir],j++)
{
r = sim->pmap[ty][tx];
if (!r && !sim->bmap[(ty)/CELL][(tx)/CELL] && ry > CELL && rx > CELL && ry < YRES-CELL && rx < XRES-CELL)
{
if (j == (len-k))//there is a safe path, so we can break out
return len+1;
count++;
}
else //we hit a block so no need to check farther here
break;
}
for (tx = rx + tron_ry[dir] , ty = ry + tron_rx[dir], j=1; abs(tx-rx) < (len-k) && abs(ty-ry) < (len-k); tx+=tron_ry[dir],ty+=tron_rx[dir],j++)
{
r = sim->pmap[ty][tx];
if (!r && !sim->bmap[(ty)/CELL][(tx)/CELL] && ry > CELL && rx > CELL && ry < YRES-CELL && rx < XRES-CELL)
{
if (j == (len-k))
return len+1;
count++;
}
else
break;
}
}
else //a block infront, no need to continue
break;
}
return count;
}
int update_TRON(UPDATE_FUNC_ARGS) {
int r, rx, ry, np;
if (parts[i].tmp&TRON_WAIT)
{
parts[i].tmp -= TRON_WAIT;
return 0;
}
if (parts[i].tmp&TRON_HEAD)
{
int firstdircheck = 0,seconddir,seconddircheck = 0,lastdir,lastdircheck = 0;
int direction = (parts[i].tmp>>2 & 0x3);
int originaldir = direction;
//random turn
int random = rand()%340;
if (random==1 || random==3)
{
//randomly turn left(3) or right(1)
direction = (direction + random)%4;
}
//check infront
//do sight check
firstdircheck = trymovetron(sim,x,y,direction,i,parts[i].tmp2);
if (firstdircheck < parts[i].tmp2)
{
if (originaldir != direction) //if we just tried a random turn, don't pick random again
{
seconddir = originaldir;
lastdir = (direction + 2)%4;
}
else
{
seconddir = (direction + ((rand()%2)*2)+1)% 4;
lastdir = (seconddir + 2)%4;
}
seconddircheck = trymovetron(sim,x,y,seconddir,i,parts[i].tmp2);
lastdircheck = trymovetron(sim,x,y,lastdir,i,parts[i].tmp2);
}
//find the best move
if (seconddircheck > firstdircheck)
direction = seconddir;
if (lastdircheck > seconddircheck && lastdircheck > firstdircheck)
direction = lastdir;
//now try making new head, even if it fails
if (new_tronhead(sim,x + tron_rx[direction],y + tron_ry[direction],i,direction) == -1)
{
//ohgod crash, <sparkle effect start here>
//trigger tail death for TRON_NODIE, or is that mode even needed? just set a high tail length(but it still won't start dying when it crashes)
}
//set own life and clear .tmp (it dies if it can't move anyway)
parts[i].life = parts[i].tmp2;
parts[i].tmp = 0;
}
else // fade tail deco, or prevent tail from dieing
{
if (parts[i].tmp&TRON_NODIE)
parts[i].life++;
parts[i].dcolour = clamp_flt((float)parts[i].life/(float)parts[i].tmp2,0,1.0f) << 24 | parts[i].dcolour&0x00FFFFFF;
}
return 0;
}
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