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Support mouse scroll wheel zoom in the Skyview

This commit is contained in:
Brandon Rhodes 2021-10-28 14:24:57 -04:00
parent 02389fa485
commit 3d7e09a347
1 changed files with 18 additions and 1 deletions
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17
GUI/xephem/skyviewmenu.c
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@ -214,6 +214,7 @@ static void chkFS_to (XtPointer client, XtIntervalId *id);
#define LOSTBSZ 10 /* Label option TB and Scale size */
#define MAXXW 16000 /* max X Win pos (SHRT_MAX broke XFree 4.2.0) */
#define PUTW 10 /* popup line title width */
#define SCROLL_WHEEL_ZOOM 1.1 /* factor by which scrollwheel affects FOV */
static char telAnon[] = "Anonymous"; /* name used for anon (pure loc) objs */
static char cns_suffix[] = ".csf"; /* constellation figure file suffix */
@ -4730,6 +4731,7 @@ Boolean *continue_to_dispatch;
int m1, b1p, b1r;
int m2, b2p, b2r;
int b3p, b3r;
int sup, sdn;
int inwin, inside;
/* what happened? */
@ -4746,6 +4748,21 @@ Boolean *continue_to_dispatch;
b2r = br && ev->xbutton.button == Button2;
b3p = bp && ev->xbutton.button == Button3;
b3r = br && ev->xbutton.button == Button3;
sdn = bp && ev->xbutton.button == Button4;
sup = bp && ev->xbutton.button == Button5;
if (sdn) { /* scroll wheel down: zoom in */
sv_set_fov(sv_vfov / SCROLL_WHEEL_ZOOM);
sv_set_scale(FOV_S, 0);
sv_all(np);
return;
}
if (sup) { /* scroll wheel up: zoom out */
sv_set_fov(sv_vfov * SCROLL_WHEEL_ZOOM);
sv_set_scale(FOV_S, 0);
sv_all(np);
return;
}
/* where are we?
* N.B. can't depend on en/lv for inwin if moving fast