Message-ID:	<20010421194907.70468.qmail@web13304.mail.yahoo.com>
Date:	Sat, 21 Apr 2001 12:49:07 -0700 (PDT)
From:	Rafael Frongillo <rmf9 AT yahoo DOT com>
Subject:	linear hline error
To:	djgpp AT delorie DOT com
MIME-Version:	1.0
Reply-To:	djgpp AT delorie DOT com

Hello

My problem is this: my program crashes once in a while
during the 'explode' function (see below) when
type==3. Sometimes the program goes right through
'explode' with type==3, but doesn't crash, other times
it does. The error message I get when symifying is:

Call frame traceback EIPs:
  0x0003fb54 __linear_hline16+484
  0x0000c920 _circlefill+368
  0x0000000a 0xa

My graphics setup is this:

set_color_depth(16);
if (set_gfx_mode(GFX_AUTODETECT, 640, 480, 0, 0) != 0)
  printf("Error: graphics init\n%s\n", allegro_error);
set_color_conversion(COLORCONV_TOTAL);

Do you know what could be causing this?

-Rafael Frongillo

FILE msls.cpp:

#include "msls.h"

MSL::MSL(){ 
  x=y=w=h=d=type=range=pn=exploding=exp=
    guynum=dx=dy=speed=damage=pushval=fdelay=0; }

int MSL::firing[WEPNUM+1] = {0,0,0,0};

MSL::MSL(int typ, int xx, int yy, int dd, int guyn)
: x(xx), y(yy), d(dd), type(typ), pn(0), exploding(0),
exp(0),
  guynum(guyn), dx(0), dy(0) {
  switch(type) {
    case 1 : range = 200; w = h = 10; fdelay = 10;
speed = 12;
      damage = 10; pushval = 5;
      play_sample(msfire[1], 255, 128, 1000, 0);
break;
    case 2 : range = 100; w = 20; h = 7; fdelay = 1;
speed = 9;
      damage = 3; pushval = 1;
      if (!firing[2]) play_sample(msfire[2], 255, 128,
1000, 1); break;
    case 3 : range = 400; w = 30; h = 8; fdelay = 18;
speed = 8;
      damage = 5; pushval = 6;
      play_sample(msfire[3], 255, 128, 1000, 0);
break;
    case 4 : range = 1000; w = speed = 100; h = 3;
fdelay = 20; damage = 10;
      pushval = 5; play_sample(msfire[4], 255, 128,
1000, 0); break;
  } int t = 0;
  switch (d) {
    case UP : t = w; w = h; h = t; y -= h; x -= w/2;
break;
    case DN : t = w; w = h; h = t; x -= w/2; break;
    case LF : x -= w; y -= h/2; break;
    case RT : y -= h/2; break;
  }
  firing[type]++;
}
void MSL::move() { int picval;
  if (exploding) explode(1);
  if (d != 0 && !exploding) {
    switch (d) {
      case LF : x -= speed; dx -= speed; picval = 1;
break;
      case RT : x += speed; dx += speed; picval = 0;
break;
      case UP : y -= speed; dy -= speed; picval = 2;
break;
      case DN : y += speed; dy += speed; picval = 3;
break;
    }
    switch (type) {
      case 1 : temp = mp1[picval][pn]; pn++; pn%=2;
break;
      case 2 : temp = mp2[picval][random()%3]; break;
      case 3 : temp = mp3[picval][pn]; pn++; pn%=4;
break;
      case 4 : temp = create_bitmap(1,1);
putpixel(temp,0,0,pink);
        switch (d) {
          case DN : y -= speed;
          case UP : h += speed;
rectfill(buf,x,y,x+w,y+h,green);
            rectfill(buf,x+1,y,x+2,y+h,yellow); break;
          case RT : x -= speed;
          case LF : w += speed;
rectfill(buf,x,y,x+w,y+h,green);
            rectfill(buf,x,y+1,x+w,y+2,yellow); break;
        }
    }
    if (abs(dx) > range || abs(dy) > range)
explode(0);
    if (d)
draw_sprite(buf,temp,x+(w-temp->w)/2,y+(h-temp->h)/2);
  }
  if (!exploding && checkWalls()) explode(1);
}

void MSL::explode(int expl) { int picval; exploding++;
  if (exploding==1) { play_sample(mshit[type], 255,
128, 1000, 0); }
  switch (d) {
    case RT : picval = 0; break;
    case LF : picval = 1; break;
    case UP : picval = 2; break;
    case DN : picval = 3; break;
  }
  switch (type) {
    case 1 : if (!expl || exploding > 3) destroy();
      else temp = mp1[picval][exploding+1]; break;
    case 2 : destroy(); break;
    case 3 : w = h = 10 * exploding; x -= 5; y -= 5;
if (exploding > 10) destroy();
      temp = create_bitmap(w,h);
rectfill(temp,0,0,w,h,pink);
      circlefill(temp,w/2,h/2,w/2,yellow);
circlefill(temp,w/2,h/2,w/2-5,orange);
      circlefill(temp,w/2,h/2,w/2-10,red);
circlefill(temp,w/2,h/2,w/2-15,pink); break;
    case 4 : temp = create_bitmap(1,1);
putpixel(temp,0,0,pink);
      switch (d) {
        case DN : y += speed;
        case UP : h -= speed;
rectfill(buf,x,y,x+w,y+h,green);
          rectfill(buf,x+1,y,x+2,y+h,yellow); break;
        case RT : x += speed;
        case LF : w -= speed;
rectfill(buf,x,y,x+w,y+h,green);
          rectfill(buf,x,y+1,x+w,y+2,yellow); break;
      }
      if (w <= 0 || h <= 0) destroy(); break;
  }
  if (exploding) {
    draw_sprite(buf,temp,x,y);
  }
}

int MSL::check(int &gx, int &gy, int gw, int gh, int
gnum) {
  if (gnum!=guynum && x+w > gx - gw/4 && x < gx + gw/4
&&
    y+h > gy + 5 && y < gy + gh) {
    if (type==3) {
      if (sqrt(pow(gx-x,2)+pow(gy-gh/2-y,2))>w+5)
return 0;
      int gd=0;
      if (gx < x + w/2) { gx -= pushval; gd = LF; }
      else if (gx > x + w/2) { gx += pushval; gd = RT;
}
      if (gy + h/2 < y + h/2 && d==UP) { gy -=
pushval; gd = UP; }
      for (int i=0; i<wallnum; i++)
walls[i].checkg(gx,gy,gw,gh,gd);
    }
    else switch (d) {
      case RT : gx += pushval;
        for (int i=0; i<wallnum; i++)
walls[i].checkg(gx,gy,gw,gh,d); break;
      case LF : gx -= pushval;
        for (int i=0; i<wallnum; i++)
walls[i].checkg(gx,gy,gw,gh,d); break;
      case UP : gy -= pushval/2;
        for (int i=0; i<wallnum; i++)
walls[i].checkg(gx,gy,gw,gh,d); break;
    }
    int k = damage; if (!exploding) exploding=1;
return k;
  }
  return 0;
}

int MSL::checkWalls() {
  for (int i=0; i<wallnum; i++)
    if (walls[i].check(x,y,w+2,h+2,d)) return 1;
  return 0;
}

void MSL::destroy() {
  firing[type]--;
  if (type == 2 && !firing[2]) stop_sample(msfire[2]);
  x=y=w=h=d=type=range=pn=exploding=exp=
    guynum=dx=dy=speed=damage=pushval=fdelay=0;
}

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