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Implemented panning

This commit is contained in:
Bert 2011-01-21 13:48:02 +01:00
parent 72e56e5207
commit b92ebf67ee
3 changed files with 74 additions and 21 deletions
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36
image.c
View File

@ -123,11 +123,13 @@ void img_render(img_t *img, win_t *win) {
/* center image in window */
img->x = (win->w - img->w * img->zoom) / 2;
img->y = (win->h - img->h * img->zoom) / 2;
} else {
/* typically after zooming and panning */
} else if (img->cp) {
/* only useful after zooming */
img_check_pan(img, win);
img->cp = 0;
}
/* calculate source and destination offsets */
if (img->x < 0) {
sx = -img->x / img->zoom;
sw = win->w / img->zoom;
@ -172,6 +174,7 @@ int img_zoom(img_t *img, float z) {
img->x -= (img->w * z - img->w * img->zoom) / 2;
img->y -= (img->h * z - img->h * img->zoom) / 2;
img->zoom = z;
img->cp = 1;
return 1;
} else {
return 0;
@ -205,3 +208,32 @@ int img_zoom_out(img_t *img) {
return 0;
}
int img_pan(img_t *img, win_t *win, pandir_t dir) {
int ox, oy;
if (!img || !win)
return 0;
ox = img->x;
oy = img->y;
switch (dir) {
case PAN_LEFT:
img->x += win->w / 5;
break;
case PAN_RIGHT:
img->x -= win->w / 5;
break;
case PAN_UP:
img->y += win->h / 5;
break;
case PAN_DOWN:
img->y -= win->h / 5;
break;
}
img_check_pan(img, win);
return ox != img->x || oy != img->y;
}

10
image.h
View File

@ -27,9 +27,17 @@ enum scalemode {
SCALE_ZOOM
};
typedef enum pandir_e {
PAN_LEFT = 0,
PAN_RIGHT,
PAN_UP,
PAN_DOWN
} pandir_t;
typedef struct img_s {
float zoom;
unsigned char re;
unsigned char cp;
int x;
int y;
int w;
@ -45,4 +53,6 @@ void img_render(img_t*, win_t*);
int img_zoom_in(img_t*);
int img_zoom_out(img_t*);
int img_pan(img_t*, win_t*, pandir_t);
#endif /* IMAGE_H */

49
main.c
View File

@ -108,13 +108,14 @@ void cleanup() {
void on_keypress(XEvent *ev) {
char key;
int len;
KeySym keysym;
int changed;
if (!ev)
return;
len = XLookupString(&ev->xkey, &key, 1, &keysym, NULL);
XLookupString(&ev->xkey, &key, 1, &keysym, NULL);
changed = 0;
switch (keysym) {
case XK_Escape:
@ -122,48 +123,58 @@ void on_keypress(XEvent *ev) {
exit(2);
case XK_space:
key = 'n';
len = 1;
break;
case XK_BackSpace:
key = 'p';
len = 1;
break;
}
if (!len)
return;
switch (key) {
case 'q':
cleanup();
exit(0);
/* navigate through image list */
case 'n':
if (fileidx + 1 < filecnt) {
img_load(&img, filenames[++fileidx]);
img_render(&img, &win);
update_title();
changed = 1;
}
break;
case 'p':
if (fileidx > 0) {
img_load(&img, filenames[--fileidx]);
img_render(&img, &win);
update_title();
changed = 1;
}
break;
/* zooming */
case '+':
case '=':
if (img_zoom_in(&img)) {
img_render(&img, &win);
update_title();
}
changed = img_zoom_in(&img);
break;
case '-':
if (img_zoom_out(&img)) {
img_render(&img, &win);
update_title();
}
changed = img_zoom_out(&img);
break;
/* panning */
case 'h':
changed = img_pan(&img, &win, PAN_LEFT);
break;
case 'j':
changed = img_pan(&img, &win, PAN_DOWN);
break;
case 'k':
changed = img_pan(&img, &win, PAN_UP);
break;
case 'l':
changed = img_pan(&img, &win, PAN_RIGHT);
break;
}
if (changed) {
img_render(&img, &win);
update_title();
}
}