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(svn r10334) -Fix [FS#937]: with smooth scrolling enabled, the viewport destination was not clamped to the map

This commit is contained in:
peter1138 2007-06-25 21:50:36 +00:00
parent 36945fd628
commit 217765fc0b
1 changed files with 33 additions and 31 deletions
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64
src/viewport.cpp
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@ -1361,6 +1361,30 @@ void DrawWindowViewport(const Window *w)
dpi->top -= w->top;
}
static inline void ClampViewportToMap(const ViewPort *vp, int &x, int &y)
{
/* Centre of the viewport is hot spot */
x += vp->virtual_width / 2;
y += vp->virtual_height / 2;
/* Convert viewport coordinates to map coordinates
* Calculation is scaled by 4 to avoid rounding errors */
int vx = -x + y * 2;
int vy = x + y * 2;
/* clamp to size of map */
vx = clamp(vx, 0, MapMaxX() * TILE_SIZE * 4);
vy = clamp(vy, 0, MapMaxY() * TILE_SIZE * 4);
/* Convert map coordinates to viewport coordinates */
x = (-vx + vy) / 2;
y = ( vx + vy) / 4;
/* Remove centreing */
x -= vp->virtual_width / 2;
y -= vp->virtual_height / 2;
}
void UpdateViewportPosition(Window *w)
{
const ViewPort *vp = w->viewport;
@ -1371,47 +1395,25 @@ void UpdateViewportPosition(Window *w)
SetViewportPosition(w, pt.x, pt.y);
} else {
int x;
int y;
int vx;
int vy;
/* Ensure the destination location is within the map */
ClampViewportToMap(vp, WP(w, vp_d).dest_scrollpos_x, WP(w, vp_d).dest_scrollpos_y);
/* 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;
int dest_x = WP(w,vp_d).dest_scrollpos_x + vp->virtual_width / 2;
int dest_y = WP(w,vp_d).dest_scrollpos_y + vp->virtual_height / 2;
int delta_x = dest_x - x;
int delta_y = dest_y - y;
int delta_x = WP(w, vp_d).dest_scrollpos_x - WP(w, vp_d).scrollpos_x;
int delta_y = WP(w, vp_d).dest_scrollpos_y - WP(w, vp_d).scrollpos_y;
if (delta_x != 0 || delta_y != 0) {
if (_patches.smooth_scroll) {
int max_scroll = ScaleByMapSize1D(512);
/* Not at our desired positon yet... */
x += clamp(delta_x / 8, -max_scroll, max_scroll);
y += clamp(delta_y / 8, -max_scroll, max_scroll);
WP(w, vp_d).scrollpos_x += clamp(delta_x / 4, -max_scroll, max_scroll);
WP(w, vp_d).scrollpos_y += clamp(delta_y / 4, -max_scroll, max_scroll);
} else {
x = dest_x;
y = dest_y;
WP(w, vp_d).scrollpos_x = WP(w, vp_d).dest_scrollpos_x;
WP(w, vp_d).scrollpos_y = WP(w, vp_d).dest_scrollpos_y;
}
}
/* 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, MapMaxX() * TILE_SIZE * 4);
vy = clamp(vy, 0 * 4, MapMaxY() * TILE_SIZE * 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;
ClampViewportToMap(vp, WP(w, vp_d).scrollpos_x, WP(w, vp_d).scrollpos_y);
SetViewportPosition(w, WP(w, vp_d).scrollpos_x, WP(w, vp_d).scrollpos_y);
}
}