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am_map.c
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am_map.c
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// Emacs style mode select -*- C++ -*-
//-----------------------------------------------------------------------------
//
// $Id:$
//
// Copyright (C) 1993-1996 by id Software, Inc.
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
//
//
// $Log:$
//
// DESCRIPTION: the automap code
//
//-----------------------------------------------------------------------------
#include <stdio.h>
#include "z_zone.h"
#include "doomdef.h"
#include "st_stuff.h"
#include "p_local.h"
#include "w_wad.h"
#include "m_cheat.h"
#include "i_system.h"
// Needs access to LFB.
#include "v_video.h"
// State.
#include "doomstat.h"
#include "r_state.h"
// Data.
#include "dstrings.h"
#include "am_map.h"
#include <libdragon.h>
extern void graphics_draw_line( display_context_t disp, int x0, int y0, int x1, int y1, uint32_t color );
extern uint32_t palarray[256];
extern surface_t *_dc;
// For use if I do walls with outsides/insides
#define REDS (256-5*16)
#define REDRANGE 16
#define BLUES (256-4*16+8)
#define BLUERANGE 8
#define GREENS (7*16)
#define GREENRANGE 16
#define GRAYS (6*16)
#define GRAYSRANGE 16
#define BROWNS (4*16)
#define BROWNRANGE 16
#define YELLOWS (256-32+7)
#define YELLOWRANGE 1
#define BLACK 0
#define WHITE (256-47)
// Automap colors
#define BACKGROUND BLACK
#define YOURCOLORS WHITE
#define YOURRANGE 0
#define WALLCOLORS REDS
#define WALLRANGE REDRANGE
#define TSWALLCOLORS GRAYS
#define TSWALLRANGE GRAYSRANGE
#define FDWALLCOLORS BROWNS
#define FDWALLRANGE BROWNRANGE
#define CDWALLCOLORS YELLOWS
#define CDWALLRANGE YELLOWRANGE
#define THINGCOLORS GREENS
#define THINGRANGE GREENRANGE
#define SECRETWALLCOLORS WALLCOLORS
#define SECRETWALLRANGE WALLRANGE
#define GRIDCOLORS (GRAYS + GRAYSRANGE/2)
#define GRIDRANGE 0
#define XHAIRCOLORS GRAYS
// drawing stuff
#define FB 0
#define AM_PANDOWNKEY KEY_DOWNARROW
#define AM_PANUPKEY KEY_UPARROW
#define AM_PANRIGHTKEY KEY_RIGHTARROW
#define AM_PANLEFTKEY KEY_LEFTARROW
#define AM_ZOOMINKEY '='
#define AM_ZOOMOUTKEY '-'
#define AM_STARTKEY KEY_TAB
#define AM_ENDKEY KEY_TAB
#define AM_GOBIGKEY '0'
#define AM_FOLLOWKEY 'f'
#define AM_GRIDKEY 'g'
#define AM_MARKKEY 'm'
#define AM_CLEARMARKKEY 'c'
#define AM_NUMMARKPOINTS 10
// scale on entry
#define INITSCALEMTOF (.2*FRACUNIT)
//#define INITSCALEMTOF 850
// how much the automap moves window per tic in frame-buffer coordinates
// moves 140 pixels in 1 second
#define F_PANINC 4
// how much zoom-in per tic
// goes to 2x in 1 second
#define M_ZOOMIN ((int) (1.02*FRACUNIT))
// how much zoom-out per tic
// pulls out to 0.5x in 1 second
#define M_ZOOMOUT ((int) (FRACUNIT/1.02))
// translates between frame-buffer and map distances
#define FTOM(x) FixedMul(((x)<<16),scale_ftom)
#define MTOF(x) (FixedMul((x),scale_mtof)>>16)
// translates between frame-buffer and map coordinates
#define CXMTOF(x) (f_x + MTOF((x)-m_x))
#define CYMTOF(y) ((f_y + (f_h - MTOF((y)-m_y)))+20)
// the following is crap
#define LINE_NEVERSEE ML_DONTDRAW
typedef struct
{
int x;
int y;
}
fpoint_t;
typedef struct
{
fpoint_t a;
fpoint_t b;
}
fline_t;
typedef struct
{
fixed_t x;
fixed_t y;
}
mpoint_t;
typedef struct
{
mpoint_t a;
mpoint_t b;
}
mline_t;
typedef struct
{
fixed_t slp;
fixed_t islp;
}
islope_t;
//
// The vector graphics for the automap.
// A line drawing of the player pointing right,
// starting from the middle.
//
#define R ((8*PLAYERRADIUS)/7)
mline_t player_arrow[] = {
{ { -R+R/8, 0 }, { R, 0 } }, // -----
{ { R, 0 }, { R-R/2, R/4 } }, // ----->
{ { R, 0 }, { R-R/2, -R/4 } },
{ { -R+R/8, 0 }, { -R-R/8, R/4 } }, // >---->
{ { -R+R/8, 0 }, { -R-R/8, -R/4 } },
{ { -R+3*R/8, 0 }, { -R+R/8, R/4 } }, // >>--->
{ { -R+3*R/8, 0 }, { -R+R/8, -R/4 } }
};
#undef R
#define NUMPLYRLINES (sizeof(player_arrow)/sizeof(mline_t))
#define R ((8*PLAYERRADIUS)/7)
mline_t cheat_player_arrow[] = {
{ { -R+R/8, 0 }, { R, 0 } }, // -----
{ { R, 0 }, { R-R/2, R/6 } }, // ----->
{ { R, 0 }, { R-R/2, -R/6 } },
{ { -R+R/8, 0 }, { -R-R/8, R/6 } }, // >----->
{ { -R+R/8, 0 }, { -R-R/8, -R/6 } },
{ { -R+3*R/8, 0 }, { -R+R/8, R/6 } }, // >>----->
{ { -R+3*R/8, 0 }, { -R+R/8, -R/6 } },
{ { -R/2, 0 }, { -R/2, -R/6 } }, // >>-d--->
{ { -R/2, -R/6 }, { -R/2+R/6, -R/6 } },
{ { -R/2+R/6, -R/6 }, { -R/2+R/6, R/4 } },
{ { -R/6, 0 }, { -R/6, -R/6 } }, // >>-dd-->
{ { -R/6, -R/6 }, { 0, -R/6 } },
{ { 0, -R/6 }, { 0, R/4 } },
{ { R/6, R/4 }, { R/6, -R/7 } }, // >>-ddt->
{ { R/6, -R/7 }, { R/6+R/32, -R/7-R/32 } },
{ { R/6+R/32, -R/7-R/32 }, { R/6+R/10, -R/7 } }
};
#undef R
#define NUMCHEATPLYRLINES (sizeof(cheat_player_arrow)/sizeof(mline_t))
#define R (FRACUNIT)
mline_t triangle_guy[] = {
{ { -.867*R, -.5*R }, { .867*R, -.5*R } },
{ { .867*R, -.5*R } , { 0, R } },
{ { 0, R }, { -.867*R, -.5*R } }
};
#undef R
#define NUMTRIANGLEGUYLINES (sizeof(triangle_guy)/sizeof(mline_t))
#define R (FRACUNIT)
mline_t thintriangle_guy[] = {
{ { -.5*R, -.7*R }, { R, 0 } },
{ { R, 0 }, { -.5*R, .7*R } },
{ { -.5*R, .7*R }, { -.5*R, -.7*R } }
};
#undef R
#define NUMTHINTRIANGLEGUYLINES (sizeof(thintriangle_guy)/sizeof(mline_t))
unsigned char cheat_amap_seq[] = { 0xb2, 0x26, 0x26, 0x2e, 0xff };
cheatseq_t cheat_amap = { cheat_amap_seq, 0 };
static int cheating = 0;
static int grid = 0;
static int leveljuststarted = 1; // kluge until AM_LevelInit() is called
boolean automapactive = false;
static int finit_width = SCREENWIDTH;
static int finit_height = SCREENHEIGHT - 32;//-44;
// location of window on screen
static int f_x;
static int f_y;
// size of window on screen
static int f_w;
static int f_h;
static int lightlev; // used for funky strobing effect
static byte* fb; // pseudo-frame buffer
static int amclock;
static mpoint_t m_paninc; // how far the window pans each tic (map coords)
static fixed_t mtof_zoommul; // how far the window zooms in each tic (map coords)
static fixed_t ftom_zoommul; // how far the window zooms in each tic (fb coords)
static fixed_t m_x, m_y; // LL x,y where the window is on the map (map coords)
static fixed_t m_x2, m_y2; // UR x,y where the window is on the map (map coords)
//
// width/height of window on map (map coords)
//
static fixed_t m_w;
static fixed_t m_h;
// based on level size
static fixed_t min_x;
static fixed_t min_y;
static fixed_t max_x;
static fixed_t max_y;
static fixed_t max_w; // max_x-min_x,
static fixed_t max_h; // max_y-min_y
// based on player size
static fixed_t min_w;
static fixed_t min_h;
static fixed_t min_scale_mtof; // used to tell when to stop zooming out
static fixed_t max_scale_mtof; // used to tell when to stop zooming in
// old stuff for recovery later
static fixed_t old_m_w, old_m_h;
static fixed_t old_m_x, old_m_y;
// old location used by the Follower routine
static mpoint_t f_oldloc;
// used by MTOF to scale from map-to-frame-buffer coords
static fixed_t scale_mtof = INITSCALEMTOF;
// used by FTOM to scale from frame-buffer-to-map coords (=1/scale_mtof)
static fixed_t scale_ftom;
static player_t *plr; // the player represented by an arrow
static patch_t *marknums[10]; // numbers used for marking by the automap
static mpoint_t markpoints[AM_NUMMARKPOINTS]; // where the points are
static int markpointnum = 0; // next point to be assigned
static int followplayer = 1; // specifies whether to follow the player around
static boolean stopped = true;
extern boolean viewactive;
//extern void V_MarkRect(int x, int y, int width, int height);
extern int *finesine2; // 10240
extern int *finetan2; // 4096
extern angle_t *tantoangle2; // 2049
// Calculates the slope and slope according to the x-axis of a line
// segment in map coordinates (with the upright y-axis n' all) so
// that it can be used with the brain-dead drawing stuff.
void AM_getIslope(mline_t* ml, islope_t* is)
{
int dx, dy;
dy = ml->a.y - ml->b.y;
dx = ml->b.x - ml->a.x;
if (!dy)
{
is->islp = (dx<0?-MAXINT:MAXINT);
}
else
{
is->islp = FixedDiv(dx, dy);
}
if (!dx)
{
is->slp = (dy<0?-MAXINT:MAXINT);
}
else
{
is->slp = FixedDiv(dy, dx);
}
}
//
//
//
void AM_activateNewScale(void)
{
m_x += m_w/2;
m_y += m_h/2;
m_w = FTOM(f_w);
m_h = FTOM(f_h);
m_x -= m_w/2;
m_y -= m_h/2;
m_x2 = m_x + m_w;
m_y2 = m_y + m_h;
}
//
//
//
void AM_saveScaleAndLoc(void)
{
old_m_x = m_x;
old_m_y = m_y;
old_m_w = m_w;
old_m_h = m_h;
}
//
//
//
void AM_restoreScaleAndLoc(void)
{
m_w = old_m_w;
m_h = old_m_h;
if (!followplayer)
{
m_x = old_m_x;
m_y = old_m_y;
}
else
{
m_x = plr->mo->x - m_w/2;
m_y = plr->mo->y - m_h/2;
}
m_x2 = m_x + m_w;
m_y2 = m_y + m_h;
// Change the scaling multipliers
scale_mtof = FixedDiv(f_w<<FRACBITS, m_w);
scale_ftom = FixedDiv(FRACUNIT, scale_mtof);
}
//
// adds a marker at the current location
//
void AM_addMark(void)
{
markpoints[markpointnum].x = m_x + m_w/2;
markpoints[markpointnum].y = m_y + m_h/2;
markpointnum = (markpointnum + 1) % AM_NUMMARKPOINTS;
}
//
// Determines bounding box of all vertices,
// sets global variables controlling zoom range.
//
void AM_findMinMaxBoundaries(void)
{
int i;
fixed_t a;
fixed_t b;
min_x = min_y = MAXINT;
max_x = max_y = -MAXINT;
for (i=0;i<numvertexes;i++)
{
if (vertexes[i].x < min_x)
{
min_x = vertexes[i].x;
}
else if (vertexes[i].x > max_x)
{
max_x = vertexes[i].x;
}
if (vertexes[i].y < min_y)
{
min_y = vertexes[i].y;
}
else if (vertexes[i].y > max_y)
{
max_y = vertexes[i].y;
}
}
max_w = max_x - min_x;
max_h = max_y - min_y;
min_w = 2*PLAYERRADIUS; // const? never changed?
min_h = 2*PLAYERRADIUS;
a = FixedDiv(f_w<<FRACBITS, max_w);
b = FixedDiv(f_h<<FRACBITS, max_h);
min_scale_mtof = a < b ? a : b;
max_scale_mtof = FixedDiv(f_h<<FRACBITS, 2*PLAYERRADIUS);
}
//
//
//
void AM_changeWindowLoc(void)
{
if (m_paninc.x || m_paninc.y)
{
followplayer = 0;
f_oldloc.x = MAXINT;
}
m_x += m_paninc.x;
m_y += m_paninc.y;
if (m_x + m_w/2 > max_x)
{
m_x = max_x - m_w/2;
}
else if (m_x + m_w/2 < min_x)
{
m_x = min_x - m_w/2;
}
if (m_y + m_h/2 > max_y)
{
m_y = max_y - m_h/2;
}
else if (m_y + m_h/2 < min_y)
{
m_y = min_y - m_h/2;
}
m_x2 = m_x + m_w;
m_y2 = m_y + m_h;
}
//
//
//
void AM_initVariables(void)
{
int pnum;
static event_t st_notify = { ev_keyup, AM_MSGENTERED };
automapactive = true;
fb = screens[0];
f_oldloc.x = MAXINT;
amclock = 0;
lightlev = 0;
m_paninc.x = m_paninc.y = 0;
ftom_zoommul = FRACUNIT;
mtof_zoommul = FRACUNIT;
m_w = FTOM(f_w);
m_h = FTOM(f_h);
// find player to center on initially
if (!playeringame[pnum = consoleplayer])
{
for (pnum=0;pnum<MAXPLAYERS;pnum++)
{
if (playeringame[pnum])
{
break;
}
}
}
plr = &players[pnum];
m_x = plr->mo->x - m_w/2;
m_y = plr->mo->y - m_h/2;
AM_changeWindowLoc();
// for saving & restoring
old_m_x = m_x;
old_m_y = m_y;
old_m_w = m_w;
old_m_h = m_h;
// inform the status bar of the change
ST_Responder(&st_notify);
}
//
//
//
void AM_loadPics(void)
{
int i;
char namebuf[9];
for (i=0;i<10;i++)
{
sprintf(namebuf, "AMMNUM%d", i);
marknums[i] = W_CacheLumpName(namebuf, PU_STATIC);
}
}
void AM_unloadPics(void)
{
int i;
for (i=0;i<10;i++)
{
Z_ChangeTag(marknums[i], PU_CACHE);
}
}
void AM_clearMarks(void)
{
int i;
for (i=0;i<AM_NUMMARKPOINTS;i++)
{
markpoints[i].x = -1; // means empty
}
markpointnum = 0;
}
//
// should be called at the start of every level
// right now, i figure it out myself
//
void AM_LevelInit(void)
{
leveljuststarted = 0;
f_x = f_y = 0;
f_w = finit_width;
f_h = finit_height;
AM_clearMarks();
AM_findMinMaxBoundaries();
scale_mtof = FixedDiv(min_scale_mtof, (int) (0.7*FRACUNIT));
if (scale_mtof > max_scale_mtof)
scale_mtof = min_scale_mtof;
scale_ftom = FixedDiv(FRACUNIT, scale_mtof);
}
//
//
//
void AM_Stop(void)
{
static event_t st_notify = { 0, ev_keyup, AM_MSGEXITED };
AM_unloadPics();
automapactive = false;
ST_Responder(&st_notify);
stopped = true;
}
//
//
//
void AM_Start(void)
{
static int lastlevel = -1, lastepisode = -1;
if (!stopped)
{
AM_Stop();
}
stopped = false;
if ((lastlevel != gamemap) || (lastepisode != gameepisode))
{
AM_LevelInit();
lastlevel = gamemap;
lastepisode = gameepisode;
}
AM_initVariables();
AM_loadPics();
}
//
// set the window scale to the maximum size
//
void AM_minOutWindowScale(void)
{
scale_mtof = min_scale_mtof;
scale_ftom = FixedDiv(FRACUNIT, scale_mtof);
AM_activateNewScale();
}
//
// set the window scale to the minimum size
//
void AM_maxOutWindowScale(void)
{
scale_mtof = max_scale_mtof;
scale_ftom = FixedDiv(FRACUNIT, scale_mtof);
AM_activateNewScale();
}
//
// Handle events (user inputs) in automap mode
//
boolean AM_Responder(event_t* ev)
{
int rc;
//static int cheatstate=0;
static int bigstate=0;
static char buffer[20];
rc = false;
if (!automapactive)
{
if (ev->type == ev_keydown && ev->data1 == AM_STARTKEY)
{
AM_Start ();
viewactive = false;
rc = true;
}
}
else if (ev->type == ev_keydown)
{
rc = true;
switch(ev->data1)
{
case AM_PANRIGHTKEY: // pan right
if (!followplayer) m_paninc.x = FTOM(F_PANINC);
else rc = false;
break;
case AM_PANLEFTKEY: // pan left
if (!followplayer) m_paninc.x = -FTOM(F_PANINC);
else rc = false;
break;
case AM_PANUPKEY: // pan up
if (!followplayer) m_paninc.y = FTOM(F_PANINC);
else rc = false;
break;
case AM_PANDOWNKEY: // pan down
if (!followplayer) m_paninc.y = -FTOM(F_PANINC);
else rc = false;
break;
case AM_ZOOMOUTKEY: // zoom out
mtof_zoommul = M_ZOOMOUT;
ftom_zoommul = M_ZOOMIN;
break;
case AM_ZOOMINKEY: // zoom in
mtof_zoommul = M_ZOOMIN;
ftom_zoommul = M_ZOOMOUT;
break;
case AM_ENDKEY:
bigstate = 0;
viewactive = true;
AM_Stop ();
break;
case AM_GOBIGKEY:
bigstate = !bigstate;
if (bigstate)
{
AM_saveScaleAndLoc();
AM_minOutWindowScale();
}
else AM_restoreScaleAndLoc();
break;
case AM_FOLLOWKEY:
followplayer = !followplayer;
f_oldloc.x = MAXINT;
plr->message = followplayer ? AMSTR_FOLLOWON : AMSTR_FOLLOWOFF;
break;
case AM_GRIDKEY:
grid = !grid;
plr->message = grid ? AMSTR_GRIDON : AMSTR_GRIDOFF;
break;
case AM_MARKKEY:
sprintf(buffer, "%s %d", AMSTR_MARKEDSPOT, markpointnum);
plr->message = buffer;
AM_addMark();
break;
case AM_CLEARMARKKEY:
AM_clearMarks();
plr->message = AMSTR_MARKSCLEARED;
break;
default:
//cheatstate=0;
rc = false;
}
if (!deathmatch && cht_CheckCheat(&cheat_amap, ev->data1))
{
rc = false;
cheating = 2;//(cheating+1) % 3;
grid = 1;
}
}
else if (ev->type == ev_keyup)
{
rc = false;
switch (ev->data1)
{
case AM_PANRIGHTKEY:
if (!followplayer) m_paninc.x = 0;
break;
case AM_PANLEFTKEY:
if (!followplayer) m_paninc.x = 0;
break;
case AM_PANUPKEY:
if (!followplayer) m_paninc.y = 0;
break;
case AM_PANDOWNKEY:
if (!followplayer) m_paninc.y = 0;
break;
case AM_ZOOMOUTKEY:
case AM_ZOOMINKEY:
mtof_zoommul = FRACUNIT;
ftom_zoommul = FRACUNIT;
break;
}
}
return rc;
}
//
// Zooming
//
void AM_changeWindowScale(void)
{
// Change the scaling multipliers
scale_mtof = FixedMul(scale_mtof, mtof_zoommul);
scale_ftom = FixedDiv(FRACUNIT, scale_mtof);
if (scale_mtof < min_scale_mtof)
{
AM_minOutWindowScale();
}
else if (scale_mtof > max_scale_mtof)
{
AM_maxOutWindowScale();
}
else
{
AM_activateNewScale();
}
}
//
//
//
void AM_doFollowPlayer(void)
{
if (f_oldloc.x != plr->mo->x || f_oldloc.y != plr->mo->y)
{
m_x = FTOM(MTOF(plr->mo->x)) - m_w/2;
m_y = FTOM(MTOF(plr->mo->y)) - m_h/2;
m_x2 = m_x + m_w;
m_y2 = m_y + m_h;
f_oldloc.x = plr->mo->x;
f_oldloc.y = plr->mo->y;
}
}
//
//
//
void AM_updateLightLev(void)
{
static int nexttic = 0;
// this was originally commented, the next line wasn't
//static int litelevels[] = { 0, 3, 5, 6, 6, 7, 7, 7 };
// was the following:
static int litelevels[] = { 0, 4, 7, 10, 12, 14, 15, 15 };
static int litelevelscnt = 0;
// Change light level
if (amclock > nexttic)
{
lightlev = litelevels[litelevelscnt++];
if (litelevelscnt == sizeof(litelevels)/sizeof(int))
{
litelevelscnt = 0;
}
nexttic = amclock + 6 - (amclock % 6);
}
}
//
// Updates on Game Tick
//
void AM_Ticker (void)
{
if (!automapactive)
return;
amclock++;
if (followplayer)
AM_doFollowPlayer();
// Change the zoom if necessary
if (ftom_zoommul != FRACUNIT)
AM_changeWindowScale();
// Change x,y location
if (m_paninc.x || m_paninc.y)
AM_changeWindowLoc();
// Update light level
AM_updateLightLev();
}
//
// Clear automap frame buffer.
//
void AM_clearFB(int color)
{
D_memset((uint16_t *)((uintptr_t)_dc->buffer + (20*320*2)), 0, 320*220*2);
}
//
// Automap clipping of lines.
//
// Based on Cohen-Sutherland clipping algorithm but with a slightly
// faster reject and precalculated slopes. If the speed is needed,
// use a hash algorithm to handle the common cases.
//
boolean
AM_clipMline
( mline_t* ml,
fline_t* fl )
{
enum
{
LEFT =1,
RIGHT =2,
BOTTOM =4,
TOP =8
};
int outcode1 = 0;
int outcode2 = 0;
int outside;
fpoint_t tmp;
int dx;
int dy;
tmp.x = -1;
tmp.y = -1;
#define DOOUTCODE(oc, mx, my) \
(oc) = 0; \
if ((my) < 0) (oc) |= TOP; \
else if ((my) >= f_h) (oc) |= BOTTOM; \
if ((mx) < 0) (oc) |= LEFT; \
else if ((mx) >= f_w) (oc) |= RIGHT;
// do trivial rejects and outcodes
if (ml->a.y > m_y2)
outcode1 = TOP;
else if (ml->a.y < m_y)
outcode1 = BOTTOM;
if (ml->b.y > m_y2)
outcode2 = TOP;
else if (ml->b.y < m_y)
outcode2 = BOTTOM;
if (outcode1 & outcode2)
return false; // trivially outside
if (ml->a.x < m_x)
outcode1 |= LEFT;
else if (ml->a.x > m_x2)
outcode1 |= RIGHT;
if (ml->b.x < m_x)
outcode2 |= LEFT;
else if (ml->b.x > m_x2)
outcode2 |= RIGHT;
if (outcode1 & outcode2)
return false; // trivially outside
// transform to frame-buffer coordinates.
fl->a.x = CXMTOF(ml->a.x);
fl->a.y = CYMTOF(ml->a.y);
fl->b.x = CXMTOF(ml->b.x);
fl->b.y = CYMTOF(ml->b.y);
DOOUTCODE(outcode1, fl->a.x, fl->a.y);
DOOUTCODE(outcode2, fl->b.x, fl->b.y);
if (outcode1 & outcode2)
return false;
while (outcode1 | outcode2)
{
// may be partially inside box
// find an outside point
if (outcode1)
outside = outcode1;
else
outside = outcode2;
// clip to each side
if (outside & TOP)
{
dy = fl->a.y - fl->b.y;
dx = fl->b.x - fl->a.x;
tmp.x = fl->a.x + (dx*(fl->a.y))/dy;
tmp.y = 0;
}