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| [A5 iPad] input tracking |
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Matthew Leverton
Supreme Loser
January 1999
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For the iPhone, it doesn't matter as much. The programmer will do something to make sure touch works. Having emulation on by default helps in Windows / Mac / Linux systems that have some sort of touch-only input that isn't registered as a mouse. I'm not even sure if that is a reality though. |
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Michał Cichoń
Member #11,736
March 2010
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OK. This is an API proposal. Please comment and criticize it. It is very likely I forgot about something. Mouse emulation is provided as alternative event source. Edit: Granularity was removed as a result of conversation about API on #allegro. 1#ifndef __al_included_allegro5_touch_input_h
2#define __al_included_allegro5_touch_input_h
3
4#include "allegro5/base.h"
5
6#ifdef __cplusplus
7 extern "C" {
8#endif
9
10
11/* Maximum number of simultaneous touches. */
12#define ALLEGRO_TOUCH_INPUT_MAX_TOUCH_COUNT 16
13
14
15typedef struct ALLEGRO_TOUCH_INPUT ALLEGRO_TOUCH_INPUT;
16
17
18/* Type: ALLEGRO_TOUCH_INPUT_STATE
19 */
20typedef struct ALLEGRO_TOUCH_STATE ALLEGRO_TOUCH_STATE;
21typedef struct ALLEGRO_TOUCH ALLEGRO_TOUCH;
22
23struct ALLEGRO_TOUCH
24{
25 /* (id) An identifier of touch. If touch is valid this number is positive.
26 * (x, y) Touch position on the screen in 1:1 resolution.
27 * (primary) True, if touch is a primary one (usually first one).
28 */
29 int id;
30 float x, y;
31 bool primary;
32};
33
34struct ALLEGRO_TOUCH_INPUT_STATE
35{
36 ALLEGRO_TOUCH touches[ALLEGRO_TOUCH_INPUT_MAX_TOUCH_COUNT];
37 struct ALLEGRO_DISPLAY *display;
38};
39
40
41AL_FUNC(bool, al_is_touch_input_installed, (void));
42AL_FUNC(bool, al_install_touch_input, (void));
43AL_FUNC(void, al_uninstall_touch_input, (void));
44AL_FUNC(void, al_get_touch_input_state, (ALLEGRO_TOUCH_INPUT_STATE *ret_state));
45
46AL_FUNC(ALLEGRO_EVENT_SOURCE *, al_get_touch_input_event_source, (void));
47AL_FUNC(ALLEGRO_EVENT_SOURCE *, al_get_touch_input_mouse_emulation_event_source, (void));
48
49
50#ifdef __cplusplus
51 }
52#endif
53
54#endif
1/* Type: ALLEGRO_TOUCH_EVENT
2 */
3typedef struct ALLEGRO_TOUCH_EVENT
4{
5 _AL_EVENT_HEADER(struct ALLEGRO_TOUCH_INPUT)
6 struct ALLEGRO_DISPLAY *display;
7 /* (id) Identifier of the event, always positive number.
8 * (x, y) Touch position on the screen in 1:1 resolution.
9 * (primary) True, if touch is a primary one (usually first one).
10 */
11 int id;
12 float x, y;
13 bool primary;
14} ALLEGRO_TOUCH_EVENT;
"God starts from scratch too" |
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Peter Wang
Member #23
April 2000
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Any reason not to use float sub-pixel positions, so the user doesn't need to look up the granularity? What does 'primary' mean?
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Michał Cichoń
Member #11,736
March 2010
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Absolutely no reason right now. Elias convinced me to use float instead of granularity. I have to agree to that, this is much simpler now. Primary determine, well primary touch. Usually mean 'the first one'. Purpose of this is to make easy for GUI libraries. If control do not need multi-touch feature all but primary touches have to be ignored. There is also guarantee that there is only one primary touch at once. This could be realized using ID, but the are not relayable. Just because they can take any positive value. "God starts from scratch too" |
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Trent Gamblin
Member #261
April 2000
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Looks pretty simple an that I like. I haven't given it a great deal of thought though.
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ImLeftFooted
Member #3,935
October 2003
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Here's what iOS gives you. UITapGestureRecognizer UIPinchGestureRecognizer UIRotationGestureRecognizer UISwipeGestureRecognizer UIPanGestureRecognizer UILongPressGestureRecognizer You can subclass UIGestureRecognizer as well, you are encouraged to override these methods: – touchesBegan:withEvent: – touchesMoved:withEvent: – touchesEnded:withEvent: – touchesCancelled:withEvent: – reset – ignoreTouch:forEvent: – canBePreventedByGestureRecognizer: – canPreventGestureRecognizer: This is all true for iOS 3.2 and above (the release that came at the same time as the iPad). |
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Michał Cichoń
Member #11,736
March 2010
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Touch Input was implemented on 5.1 branch. You all are free to test it. At the moment two drivers are implemented, one for iDevices, second for Windows 7. "God starts from scratch too" |
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Matthew Leverton
Supreme Loser
January 1999
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I must call this function al_get_touch_input_mouse_emulation_event_source(). |
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Michał Cichoń
Member #11,736
March 2010
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Actually to make it work, you will need also to call al_install_touch_input(). "God starts from scratch too" |
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Neil Walker
Member #210
April 2000
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Michał Cichoń said: al_get_touch_input_mouse_emulation_event_source() Well, the clueless java fan-boys make all their methods cover at least three-quarters of screen space, so if it's good enough for them Neil. wii:0356-1384-6687-2022, kart:3308-4806-6002. XBOX:chucklepie |
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Michał Cichoń
Member #11,736
March 2010
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That's good. Because rest of the screen is usually unused. In real, this name looks that way because there are some rules to follow in Allegro. "God starts from scratch too" |
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Neil Walker
Member #210
April 2000
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Michał Cichoń said: there are some rules to follow in Allegro Being consistent is boring, I like the olden days when palette was spelt wrong and draw sprite and blit had the parameters the wrong way round from each other. Neil. wii:0356-1384-6687-2022, kart:3308-4806-6002. XBOX:chucklepie |
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Michał Cichoń
Member #11,736
March 2010
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Everything was wrong then. You got DOS instead of OS and so on. "God starts from scratch too" |
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Aaron Santiago
Member #12,074
June 2010
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Neil Walker said: Being consistent is boring, I like the olden days when palette was spelt wrong and draw sprite and blit had the parameters the wrong way round from each other.
Oh, hell yeah. |
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