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ubb-la/gui.c: Shift+Left/Right jumps "intelligently" to next change on any channel

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This commit is contained in:
Werner Almesberger 2013-02-01 12:29:24 -03:00
parent 47e5859c5b
commit aa1106e120
2 changed files with 46 additions and 8 deletions
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3
ubb-la/README
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@ -82,7 +82,8 @@ command line. Example:
In the GUI, the following keys are available:
Left/Right Pan the waveform left/right
Left/Right Pan the waveform left/right. With Shift, jump to the
next change on any channel in the specified direction.
Up/Down Zoom in/out
Space Set the user origin (upward-facing green triangle)
at the current position and display the time to

51
ubb-la/gui.c
View File

@ -485,13 +485,36 @@ static int pos_step(int zoom)
}
static int smart_pos(const uint8_t *buf, int skip, int nibbles,
int pos, int dir)
{
uint8_t ref;
if (dir < 0) {
if (!pos)
return pos;
ref = get_sample(buf, skip+pos-1);
} else {
ref = get_sample(buf, skip+pos);
}
do {
pos += dir;
if (pos < 0 || pos == nibbles-skip)
return pos-dir;
} while (get_sample(buf, skip+pos) == ref);
if (dir < 0)
pos++;
return pos;
}
void gui(const uint8_t *buf, int skip, int nibbles, double freq)
{
SDL_Event event;
int pos = (skip+nibbles) >> 1;
int zoom; /* < 0: zoom out; 0: 1 pixel = 1 sample; > 1: zoom in */
int min_zoom = 0;
int i;
int i, shift;
while (XWIDTH < (nibbles-skip) >> -min_zoom)
min_zoom--;
@ -515,6 +538,7 @@ void gui(const uint8_t *buf, int skip, int nibbles, double freq)
SDL_WaitEvent(&event);
switch (event.type) {
case SDL_KEYDOWN:
shift = event.key.keysym.mod & KMOD_SHIFT;
switch (event.key.keysym.sym) {
case SDLK_UP:
if (zoom < MAX_ZOOM)
@ -525,14 +549,24 @@ void gui(const uint8_t *buf, int skip, int nibbles, double freq)
zoom--;
break;
case SDLK_LEFT:
pos -= pos_step(zoom);
if (pos < 0)
pos = 0;
if (shift) {
pos = smart_pos(buf,
skip, nibbles, pos, -1);
} else {
pos -= pos_step(zoom);
if (pos < 0)
pos = 0;
}
break;
case SDLK_RIGHT:
pos += pos_step(zoom);
if (pos > nibbles-skip-1)
pos = nibbles-skip-1;
if (shift) {
pos = smart_pos(buf,
skip, nibbles, pos, 1);
} else {
pos += pos_step(zoom);
if (pos > nibbles-skip-1)
pos = nibbles-skip-1;
}
break;
case SDLK_SPACE:
if (pos == user_ref)
@ -543,6 +577,9 @@ void gui(const uint8_t *buf, int skip, int nibbles, double freq)
case SDLK_RETURN:
case SDLK_q:
return;
case SDLK_LSHIFT:
case SDLK_RSHIFT:
continue;
default:
printf("%x\n", event.key.keysym.sym);
continue;