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Add basic touch/finger support to `testpen.c` 

Reuses the pen code as much as possible.

Seems like the right place, see
https://github.com/libsdl-org/SDL/pull/8749#issuecomment-1869671334.
This commit is contained in:
Susko3 2023-12-26 20:16:05 +01:00 committed by Sam Lantinga
parent a3b5eb07b2
commit a961066d0b
1 changed files with 35 additions and 1 deletions
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36
test/testpen.c
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@ -308,6 +308,15 @@ static void update_axes(float *axes)
last_rotation = axes[SDL_PEN_AXIS_ROTATION];
}
static void update_axes_from_touch(const float pressure)
{
last_xtilt = 0;
last_ytilt = 0;
last_pressure = pressure;
last_distance = 0;
last_rotation = 0;
}
static void process_event(SDL_Event event)
{
SDLTest_CommonEvent(state, &event, &quitting);
@ -341,7 +350,7 @@ static void process_event(SDL_Event event)
}
}
#endif
if (event.motion.which != SDL_PEN_MOUSEID) {
if (event.motion.which != SDL_PEN_MOUSEID && event.motion.which != SDL_TOUCH_MOUSEID) {
SDL_ShowCursor();
} break;
@ -444,6 +453,31 @@ static void process_event(SDL_Event event)
break;
#endif
case SDL_EVENT_FINGER_DOWN:
case SDL_EVENT_FINGER_MOTION:
case SDL_EVENT_FINGER_UP:
{
SDL_TouchFingerEvent *ev = &event.tfinger;
int w, h;
SDL_HideCursor();
SDL_GetWindowSize(SDL_GetWindowFromID(ev->windowID), &w, &h);
last_x = ev->x * w;
last_y = ev->y * h;
update_axes_from_touch(ev->pressure);
last_was_eraser = SDL_FALSE;
last_button = 0;
last_touching = (ev->type != SDL_EVENT_FINGER_UP);
#if VERBOSE
SDL_Log("[%lu] finger %s: %s (touchId: %" SDL_PRIs64 ", fingerId: %" SDL_PRIs64 ") at (%.4f, %.4f); pressure=%.3f\n",
(unsigned long) ev->timestamp,
ev->type == SDL_EVENT_FINGER_DOWN ? "down" : (ev->type == SDL_EVENT_FINGER_MOTION ? "motion" : "up"),
SDL_GetTouchDeviceName(ev->touchId),
ev->touchId,
ev->fingerId,
last_x, last_y, last_pressure);
#endif
} break;
default:
break;
}