mirror of https://github.com/libsdl-org/SDL
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
301 lines
8.1 KiB
C
301 lines
8.1 KiB
C
/*
|
|
Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
|
|
|
|
This software is provided 'as-is', without any express or implied
|
|
warranty. In no event will the authors be held liable for any damages
|
|
arising from the use of this software.
|
|
|
|
Permission is granted to anyone to use this software for any purpose,
|
|
including commercial applications, and to alter it and redistribute it
|
|
freely.
|
|
*/
|
|
|
|
/* Usage:
|
|
* Spacebar to begin recording a gesture on all touches.
|
|
* s to save all touches into "./gestureSave"
|
|
* l to load all touches from "./gestureSave"
|
|
*/
|
|
|
|
#include "SDL.h"
|
|
#include <stdlib.h> /* for exit() */
|
|
|
|
#ifdef __EMSCRIPTEN__
|
|
#include <emscripten/emscripten.h>
|
|
#endif
|
|
|
|
#include "SDL_test.h"
|
|
#include "SDL_test_common.h"
|
|
|
|
#define WIDTH 640
|
|
#define HEIGHT 480
|
|
#define BPP 4
|
|
|
|
/* MUST BE A POWER OF 2! */
|
|
#define EVENT_BUF_SIZE 256
|
|
|
|
#define VERBOSE 0
|
|
|
|
static SDLTest_CommonState *state;
|
|
static SDL_Event events[EVENT_BUF_SIZE];
|
|
static int eventWrite;
|
|
static int colors[7] = { 0xFF, 0xFF00, 0xFF0000, 0xFFFF00, 0x00FFFF, 0xFF00FF, 0xFFFFFF };
|
|
static int quitting = 0;
|
|
|
|
typedef struct
|
|
{
|
|
float x, y;
|
|
} Point;
|
|
|
|
typedef struct
|
|
{
|
|
float ang, r;
|
|
Point p;
|
|
} Knob;
|
|
|
|
static Knob knob = { 0.0f, 0.1f, { 0.0f, 0.0f } };
|
|
|
|
static void
|
|
setpix(SDL_Surface *screen, float _x, float _y, unsigned int col)
|
|
{
|
|
Uint32 *pixmem32;
|
|
Uint32 colour;
|
|
Uint8 r, g, b;
|
|
const int x = (int)_x;
|
|
const int y = (int)_y;
|
|
float a;
|
|
|
|
if ((x < 0) || (x >= screen->w) || (y < 0) || (y >= screen->h)) {
|
|
return;
|
|
}
|
|
|
|
pixmem32 = (Uint32 *)screen->pixels + y * screen->pitch / BPP + x;
|
|
|
|
SDL_memcpy(&colour, pixmem32, screen->format->BytesPerPixel);
|
|
|
|
SDL_GetRGB(colour, screen->format, &r, &g, &b);
|
|
|
|
/* r = 0;g = 0; b = 0; */
|
|
a = (float)((col >> 24) & 0xFF);
|
|
if (a == 0) {
|
|
a = 0xFF; /* Hack, to make things easier. */
|
|
}
|
|
|
|
a = (a == 0.0f) ? 1 : (a / 255.0f);
|
|
r = (Uint8)(r * (1 - a) + ((col >> 16) & 0xFF) * a);
|
|
g = (Uint8)(g * (1 - a) + ((col >> 8) & 0xFF) * a);
|
|
b = (Uint8)(b * (1 - a) + ((col >> 0) & 0xFF) * a);
|
|
colour = SDL_MapRGB(screen->format, r, g, b);
|
|
|
|
*pixmem32 = colour;
|
|
}
|
|
|
|
#if 0 /* unused */
|
|
static void
|
|
drawLine(SDL_Surface *screen, float x0, float y0, float x1, float y1, unsigned int col)
|
|
{
|
|
float t;
|
|
for (t = 0; t < 1; t += (float) (1.0f / SDL_max(SDL_fabs(x0 - x1), SDL_fabs(y0 - y1)))) {
|
|
setpix(screen, x1 + t * (x0 - x1), y1 + t * (y0 - y1), col);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
static void
|
|
drawCircle(SDL_Surface *screen, float x, float y, float r, unsigned int c)
|
|
{
|
|
float tx, ty, xr;
|
|
for (ty = (float)-SDL_fabs(r); ty <= (float)SDL_fabs((int)r); ty++) {
|
|
xr = (float)SDL_sqrt(r * r - ty * ty);
|
|
if (r > 0) { /* r > 0 ==> filled circle */
|
|
for (tx = -xr + 0.5f; tx <= xr - 0.5f; tx++) {
|
|
setpix(screen, x + tx, y + ty, c);
|
|
}
|
|
} else {
|
|
setpix(screen, x - xr + 0.5f, y + ty, c);
|
|
setpix(screen, x + xr - 0.5f, y + ty, c);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
drawKnob(SDL_Surface *screen, const Knob *k)
|
|
{
|
|
drawCircle(screen, k->p.x * screen->w, k->p.y * screen->h, k->r * screen->w, 0xFFFFFF);
|
|
drawCircle(screen, (k->p.x + k->r / 2 * SDL_cosf(k->ang)) * screen->w,
|
|
(k->p.y + k->r / 2 * SDL_sinf(k->ang)) * screen->h, k->r / 4 * screen->w, 0);
|
|
}
|
|
|
|
static void
|
|
DrawScreen(SDL_Window *window)
|
|
{
|
|
SDL_Surface *screen = SDL_GetWindowSurface(window);
|
|
int i;
|
|
|
|
if (screen == NULL) {
|
|
return;
|
|
}
|
|
|
|
SDL_FillRect(screen, NULL, SDL_MapRGB(screen->format, 75, 75, 75));
|
|
|
|
/* draw Touch History */
|
|
for (i = eventWrite; i < eventWrite + EVENT_BUF_SIZE; ++i) {
|
|
const SDL_Event *event = &events[i & (EVENT_BUF_SIZE - 1)];
|
|
const float age = (float)(i - eventWrite) / EVENT_BUF_SIZE;
|
|
float x, y;
|
|
unsigned int c, col;
|
|
|
|
if ((event->type == SDL_FINGERMOTION) ||
|
|
(event->type == SDL_FINGERDOWN) ||
|
|
(event->type == SDL_FINGERUP)) {
|
|
x = event->tfinger.x;
|
|
y = event->tfinger.y;
|
|
|
|
/* draw the touch: */
|
|
c = colors[event->tfinger.fingerId % 7];
|
|
col = ((unsigned int)(c * (0.1f + 0.85f))) | (unsigned int)(0xFF * age) << 24;
|
|
|
|
if (event->type == SDL_FINGERMOTION) {
|
|
drawCircle(screen, x * screen->w, y * screen->h, 5, col);
|
|
} else if (event->type == SDL_FINGERDOWN) {
|
|
drawCircle(screen, x * screen->w, y * screen->h, -10, col);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (knob.p.x > 0) {
|
|
drawKnob(screen, &knob);
|
|
}
|
|
|
|
SDL_UpdateWindowSurface(window);
|
|
}
|
|
|
|
static void
|
|
loop(void)
|
|
{
|
|
SDL_Event event;
|
|
SDL_RWops *stream;
|
|
int i;
|
|
|
|
while (SDL_PollEvent(&event)) {
|
|
SDLTest_CommonEvent(state, &event, &quitting);
|
|
|
|
/* Record _all_ events */
|
|
events[eventWrite & (EVENT_BUF_SIZE - 1)] = event;
|
|
eventWrite++;
|
|
|
|
switch (event.type) {
|
|
case SDL_KEYDOWN:
|
|
switch (event.key.keysym.sym) {
|
|
case SDLK_i:
|
|
{
|
|
for (i = 0; i < SDL_GetNumTouchDevices(); ++i) {
|
|
const SDL_TouchID id = SDL_GetTouchDevice(i);
|
|
const char *name = SDL_GetTouchName(i);
|
|
SDL_Log("Fingers Down on device %" SDL_PRIs64 " (%s): %d", id, name, SDL_GetNumTouchFingers(id));
|
|
}
|
|
break;
|
|
}
|
|
|
|
case SDLK_SPACE:
|
|
SDL_RecordGesture(-1);
|
|
break;
|
|
|
|
case SDLK_s:
|
|
stream = SDL_RWFromFile("gestureSave", "w");
|
|
SDL_Log("Wrote %i templates", SDL_SaveAllDollarTemplates(stream));
|
|
SDL_RWclose(stream);
|
|
break;
|
|
|
|
case SDLK_l:
|
|
stream = SDL_RWFromFile("gestureSave", "r");
|
|
SDL_Log("Loaded: %i", SDL_LoadDollarTemplates(-1, stream));
|
|
SDL_RWclose(stream);
|
|
break;
|
|
}
|
|
break;
|
|
|
|
#if VERBOSE
|
|
case SDL_FINGERMOTION:
|
|
SDL_Log("Finger: %" SDL_PRIs64 ", x: %f, y: %f", event.tfinger.fingerId,
|
|
event.tfinger.x, event.tfinger.y);
|
|
break;
|
|
|
|
case SDL_FINGERDOWN:
|
|
SDL_Log("Finger: %" SDL_PRIs64 " down - x: %f, y: %f",
|
|
event.tfinger.fingerId, event.tfinger.x, event.tfinger.y);
|
|
break;
|
|
|
|
case SDL_FINGERUP:
|
|
SDL_Log("Finger: %" SDL_PRIs64 " up - x: %f, y: %f",
|
|
event.tfinger.fingerId, event.tfinger.x, event.tfinger.y);
|
|
break;
|
|
#endif
|
|
|
|
case SDL_MULTIGESTURE:
|
|
#if VERBOSE
|
|
SDL_Log("Multi Gesture: x = %f, y = %f, dAng = %f, dR = %f",
|
|
event.mgesture.x, event.mgesture.y,
|
|
event.mgesture.dTheta, event.mgesture.dDist);
|
|
SDL_Log("MG: numDownTouch = %i", event.mgesture.numFingers);
|
|
#endif
|
|
|
|
knob.p.x = event.mgesture.x;
|
|
knob.p.y = event.mgesture.y;
|
|
knob.ang += event.mgesture.dTheta;
|
|
knob.r += event.mgesture.dDist;
|
|
break;
|
|
|
|
case SDL_DOLLARGESTURE:
|
|
SDL_Log("Gesture %" SDL_PRIs64 " performed, error: %f",
|
|
event.dgesture.gestureId, event.dgesture.error);
|
|
break;
|
|
|
|
case SDL_DOLLARRECORD:
|
|
SDL_Log("Recorded gesture: %" SDL_PRIs64 "", event.dgesture.gestureId);
|
|
break;
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < state->num_windows; ++i) {
|
|
if (state->windows[i]) {
|
|
DrawScreen(state->windows[i]);
|
|
}
|
|
}
|
|
|
|
#ifdef __EMSCRIPTEN__
|
|
if (quitting) {
|
|
emscripten_cancel_main_loop();
|
|
}
|
|
#endif
|
|
}
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
state = SDLTest_CommonCreateState(argv, SDL_INIT_VIDEO);
|
|
if (state == NULL) {
|
|
return 1;
|
|
}
|
|
|
|
state->window_title = "Gesture Test";
|
|
state->window_w = WIDTH;
|
|
state->window_h = HEIGHT;
|
|
state->skip_renderer = SDL_TRUE;
|
|
|
|
if (!SDLTest_CommonDefaultArgs(state, argc, argv) || !SDLTest_CommonInit(state)) {
|
|
SDLTest_CommonQuit(state);
|
|
return 1;
|
|
}
|
|
|
|
#ifdef __EMSCRIPTEN__
|
|
emscripten_set_main_loop(loop, 0, 1);
|
|
#else
|
|
while (!quitting) {
|
|
loop();
|
|
}
|
|
#endif
|
|
|
|
SDLTest_CommonQuit(state);
|
|
return 0;
|
|
}
|
|
|