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(svn r1063) Improve scrolling limits a bit. You now can scroll further away from the map at the NW and NE edge.

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Hopefully this new code is also a bit more comprehensible than the old. (;
This commit is contained in:
tron 2004-12-13 18:33:47 +00:00
parent d6e4999f1f
commit d1d33372ff
1 changed files with 25 additions and 12 deletions
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37
viewport.c
View File

@ -1276,28 +1276,39 @@ void UpdateViewportPosition(Window *w)
pt = MapXYZToViewport(vp, veh->x_pos, veh->y_pos, veh->z_pos);
SetViewportPosition(w, pt.x, pt.y);
} else {
#if !defined(NEW_ROTATION)
int x;
int y;
int vx;
int vy;
// Center of the viewport is hot spot
x = WP(w,vp_d).scrollpos_x + vp->virtual_width / 2;
y = WP(w,vp_d).scrollpos_y + vp->virtual_height / 2;
// Convert viewport coordinates to map coordinates
// Calculation is scaled by 4 to avoid rounding errors
vx = -x + y * 2;
vy = x + y * 2;
// clamp to size of map
vx = clamp(vx, 0 * 4, TILE_X_MAX * 16 * 4);
vy = clamp(vy, 0 * 4, TILE_Y_MAX * 16 * 4);
// Convert map coordinates to viewport coordinates
x = (-vx + vy) / 2;
y = ( vx + vy) / 4;
// Set position
WP(w,vp_d).scrollpos_x = x - vp->virtual_width / 2;
WP(w,vp_d).scrollpos_y = y - vp->virtual_height / 2;
#else
int x,y,t;
int err;
x = WP(w,vp_d).scrollpos_x >> 2;
y = WP(w,vp_d).scrollpos_y >> 1;
#if !defined(NEW_ROTATION)
t = x;
x = y - t;
y = y + t;
// check if inside bounds?
t = (-130) << vp->zoom;
err = 0;
if (y < t || y > (t += TILE_Y_MAX*16-1)) { y = t; err++; }
if (x < (t=0) || x > (t=TILE_X_MAX*16-1) ) { x = t; err++; }
#else
t = x;
x = x + y;
y = x - y;
err= 0;
#endif
if (err != 0) {
/* coordinate remap */
@ -1306,6 +1317,8 @@ void UpdateViewportPosition(Window *w)
WP(w,vp_d).scrollpos_x = pt.x & t;
WP(w,vp_d).scrollpos_y = pt.y & t;
}
#endif
SetViewportPosition(w, WP(w,vp_d).scrollpos_x, WP(w,vp_d).scrollpos_y);
}
}