diff options
author | Bert <ber.t@gmx.com> | 2011-01-20 23:22:00 +0100 |
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committer | Bert <ber.t@gmx.com> | 2011-01-20 23:22:00 +0100 |
commit | bb12b8c0fbc4d0a791f8a2cb8c7f2d64df995a4d (patch) | |
tree | 5a10ba48c3393f1b23f446cac915da0dfd6f730e /image.c | |
parent | 376c0d90c7d9162c05e693c198911a4cf000f5a3 (diff) | |
download | nsxiv-bb12b8c0fbc4d0a791f8a2cb8c7f2d64df995a4d.tar.zst |
First try on zooming
Diffstat (limited to 'image.c')
-rw-r--r-- | image.c | 62 |
1 files changed, 62 insertions, 0 deletions
@@ -88,6 +88,28 @@ void img_display(img_t *img, win_t *win) { img_render(img, win); } +void img_check_pan(img_t *img, win_t *win) { + if (!img) + return; + + if (img->w * img->zoom > win->w) { + if (img->x > 0 && img->x + img->w * img->zoom > win->w) + img->x = 0; + if (img->x < 0 && img->x + img->w * img->zoom < win->w) + img->x = win->w - img->w * img->zoom; + } else { + img->x = (win->w - img->w * img->zoom) / 2; + } + if (img->h * img->zoom > win->h) { + if (img->y > 0 && img->y + img->h * img->zoom > win->h) + img->y = 0; + if (img->y < 0 && img->y + img->h * img->zoom < win->h) + img->y = win->h - img->h * img->zoom; + } else { + img->y = (win->h - img->h * img->zoom) / 2; + } +} + void img_render(img_t *img, win_t *win) { int sx, sy, sw, sh; int dx, dy, dw, dh; @@ -95,6 +117,8 @@ void img_render(img_t *img, win_t *win) { if (!img || !win || !imlib_context_get_image()) return; + img_check_pan(img, win); + if (img->x < 0) { sx = -img->x / img->zoom; sw = win->w / img->zoom; @@ -125,3 +149,41 @@ void img_render(img_t *img, win_t *win) { win_draw(win); } + +int img_zoom(img_t *img, int d) { + int ad, iz; + float z; + + if (!img) + return 0; + + ad = ABS(d); + iz = (int) (img->zoom * 1000.0) + d; + if (iz % ad > ad / 2) + iz += ad - iz % ad; + else + iz -= iz % ad; + z = (float) iz / 1000.0; + + if (z * 100.0 < ZOOM_MIN) + z = ZOOM_MIN / 100.0; + else if (z * 100.0 > ZOOM_MAX) + z = ZOOM_MAX / 100.0; + + if (z != img->zoom) { + img->x -= (img->w * z - img->w * img->zoom) / 2; + img->y -= (img->h * z - img->h * img->zoom) / 2; + img->zoom = z; + return 1; + } else { + return 0; + } +} + +int img_zoom_in(img_t *img) { + return img_zoom(img, 125); +} + +int img_zoom_out(img_t *img) { + return img_zoom(img, -125); +} |