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Emscripten: implemented two finger pinch-zoom

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This commit is contained in:
Sergii Pylypenko
2021-12-20 01:58:06 +02:00
parent aee14799a6
commit 744951c8df
1 changed files with 80 additions and 2 deletions
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82
src/video/sdl2_v.cpp
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@@ -31,6 +31,9 @@
#include "../safeguards.h"
static bool old_ctrl_pressed = false;
static Point _multitouch_second_point = {-1, -1};
static int _multitouch_finger_distance = 0;
enum { PINCH_ZOOM_SENSITIVITY = 20 };
#ifdef __EMSCRIPTEN__
static bool fullscreen_first_click = false;
#endif
@@ -407,8 +410,26 @@ bool VideoDriver_SDL_Base::PollEvent()
switch (ev.type) {
case SDL_MOUSEMOTION:
if (_cursor.UpdateCursorPosition(ev.motion.x, ev.motion.y, true)) {
SDL_WarpMouseInWindow(this->sdl_window, _cursor.pos.x, _cursor.pos.y);
if (_multitouch_second_point.x >= 0) {
Point mouse;
SDL_GetMouseState(&mouse.x, &mouse.y);
_cursor.UpdateCursorPosition((mouse.x + _multitouch_second_point.x) / 2, (mouse.y + _multitouch_second_point.y) / 2, false);
int pinch_zoom_threshold = std::min(_cur_resolution.width, _cur_resolution.height) / PINCH_ZOOM_SENSITIVITY;
int new_distance = sqrtf(powf(mouse.x - _multitouch_second_point.x, 2) + powf(mouse.y - _multitouch_second_point.y, 2));
if (new_distance - _multitouch_finger_distance >= pinch_zoom_threshold) {
_multitouch_finger_distance += pinch_zoom_threshold;
_cursor.wheel--;
_right_button_down = false;
}
if (_multitouch_finger_distance - new_distance >= pinch_zoom_threshold) {
_multitouch_finger_distance -= pinch_zoom_threshold;
_cursor.wheel++;
_right_button_down = false;
}
} else {
if (_cursor.UpdateCursorPosition(ev.motion.x, ev.motion.y, true)) {
SDL_WarpMouseInWindow(this->sdl_window, _cursor.pos.x, _cursor.pos.y);
}
}
HandleMouseEvents();
break;
@@ -434,6 +455,8 @@ bool VideoDriver_SDL_Base::PollEvent()
case SDL_BUTTON_RIGHT:
_right_button_down = true;
_right_button_clicked = true;
_right_button_down_pos.x = _cursor.pos.x;
_right_button_down_pos.y = _cursor.pos.y;
break;
default: break;
@@ -470,6 +493,61 @@ bool VideoDriver_SDL_Base::PollEvent()
#endif
break;
case SDL_FINGERDOWN:
//Debug(misc, 0, "Finger {} down at {}:{}", ev.tfinger.fingerId, ev.tfinger.x, ev.tfinger.y);
if (ev.tfinger.fingerId == 1) {
_left_button_down = false;
_left_button_clicked = false;
HandleMouseEvents(); // Release left mouse button
_multitouch_second_point.x = Clamp(ev.tfinger.x, 0.0f, 1.0f) * _cur_resolution.width;
_multitouch_second_point.y = Clamp(ev.tfinger.y, 0.0f, 1.0f) * _cur_resolution.height;
Point mouse;
SDL_GetMouseState(&mouse.x, &mouse.y);
_cursor.UpdateCursorPosition((mouse.x + _multitouch_second_point.x) / 2, (mouse.y + _multitouch_second_point.y) / 2, false);
_right_button_down_pos.x = _cursor.pos.x;
_right_button_down_pos.y = _cursor.pos.y;
_multitouch_finger_distance = sqrtf(powf(mouse.x - _multitouch_second_point.x, 2) + powf(mouse.y - _multitouch_second_point.y, 2));
HandleMouseEvents(); // Move mouse with no buttons pressed to the middle position between fingers
_right_button_down = true;
_right_button_clicked = true;
HandleMouseEvents(); // Simulate right button click with two finger touch
}
break;
case SDL_FINGERUP:
//Debug(misc, 0, "Finger {} up at {}:{}", ev.tfinger.fingerId, ev.tfinger.x, ev.tfinger.y);
if (ev.tfinger.fingerId == 1) {
_right_button_down = false;
_multitouch_second_point.x = -1;
_multitouch_second_point.y = -1;
HandleMouseEvents();
}
break;
case SDL_FINGERMOTION:
//Debug(misc, 0, "Finger {} move at {}:{}", ev.tfinger.fingerId, ev.tfinger.x, ev.tfinger.y);
if (ev.tfinger.fingerId == 1) {
_multitouch_second_point.x = Clamp(ev.tfinger.x, 0.0f, 1.0f) * _cur_resolution.width;
_multitouch_second_point.y = Clamp(ev.tfinger.y, 0.0f, 1.0f) * _cur_resolution.height;
Point mouse;
SDL_GetMouseState(&mouse.x, &mouse.y);
_cursor.UpdateCursorPosition((mouse.x + _multitouch_second_point.x) / 2, (mouse.y + _multitouch_second_point.y) / 2, false);
int pinch_zoom_threshold = std::min(_cur_resolution.width, _cur_resolution.height) / PINCH_ZOOM_SENSITIVITY;
int new_distance = sqrtf(powf(mouse.x - _multitouch_second_point.x, 2) + powf(mouse.y - _multitouch_second_point.y, 2));
if (new_distance - _multitouch_finger_distance >= pinch_zoom_threshold) {
_multitouch_finger_distance += pinch_zoom_threshold;
_cursor.wheel--;
_right_button_down = false;
}
if (_multitouch_finger_distance - new_distance >= pinch_zoom_threshold) {
_multitouch_finger_distance -= pinch_zoom_threshold;
_cursor.wheel++;
_right_button_down = false;
}
HandleMouseEvents();
}
break;
case SDL_QUIT:
HandleExitGameRequest();
break;