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testgesture: cleaned up code formatting, etc.

This commit is contained in:
Ryan C. Gordon 2019-03-15 22:39:31 -04:00
parent 7cc0a606d8
commit 6727408d2c
1 changed files with 206 additions and 205 deletions
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151
test/testgesture.c
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@ -9,6 +9,7 @@
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"
@ -32,90 +33,99 @@
/* 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 {
typedef struct
{
float x, y;
} Point;
typedef struct {
typedef struct
{
float ang, r;
Point p;
} Knob;
static Knob knob;
static Knob knob = { 0.0f, 0.1f, { 0.0f, 0.0f } };
void setpix(SDL_Surface *screen, float _x, float _y, unsigned int col)
static void
setpix(SDL_Surface *screen, float _x, float _y, unsigned int col)
{
Uint32 *pixmem32;
Uint32 colour;
Uint8 r, g, b;
int x = (int)_x;
int y = (int)_y;
const int x = (int)_x;
const int y = (int)_y;
float a;
if(x < 0 || x >= screen->w) return;
if(y < 0 || y >= screen->h) return;
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 /= 0xFF;
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);
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;
}
void drawLine(SDL_Surface *screen,float x0,float y0,float x1,float y1,unsigned int col) {
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.f/SDL_max(SDL_fabs(x0-x1),SDL_fabs(y0-y1))))
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);
}
}
void drawCircle(SDL_Surface* screen,float x,float y,float r,unsigned int c)
static void
drawCircle(SDL_Surface *screen, float x, float y, float r, unsigned int c)
{
float tx,ty;
float xr;
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+.5f;tx<=xr-.5;tx++) {
for(tx = -xr + 0.5f; tx <= xr - 0.5f; tx++) {
setpix(screen, x + tx, y + ty, c);
}
}
else {
setpix(screen,x-xr+.5f,y+ty,c);
setpix(screen,x+xr-.5f,y+ty,c);
} else {
setpix(screen, x - xr + 0.5f, y + ty, c);
setpix(screen, x + xr - 0.5f, y + ty, c);
}
}
}
void drawKnob(SDL_Surface* screen,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
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);
}
void DrawScreen(SDL_Window* window)
static void
DrawScreen(SDL_Window *window)
{
SDL_Surface *screen = SDL_GetWindowSurface(window);
int i;
@ -124,81 +134,75 @@ void DrawScreen(SDL_Window* window)
return;
}
#if 1
SDL_FillRect(screen, NULL, 0);
#else
int x, y;
for(y = 0;y < screen->h;y++)
for(x = 0;x < screen->w;x++)
setpix(screen,(float)x,(float)y,((x%255)<<16) + ((y%255)<<8) + (x+y)%255);
#endif
/* draw Touch History */
for (i = eventWrite; i < eventWrite + EVENT_BUF_SIZE; ++i) {
const SDL_Event *event = &events[i & (EVENT_BUF_SIZE - 1)];
float age = (float)(i - eventWrite) / EVENT_BUF_SIZE;
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) {
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*(.1+.85))) | (unsigned int)(0xFF*age)<<24;
col = ((unsigned int) (c * (0.1f + 0.85f))) | (unsigned int) (0xFF * age) << 24;
if(event->type == SDL_FINGERMOTION)
if (event->type == SDL_FINGERMOTION) {
drawCircle(screen, x * screen->w, y * screen->h, 5, col);
else if(event->type == SDL_FINGERDOWN)
} else if (event->type == SDL_FINGERDOWN) {
drawCircle(screen, x * screen->w, y * screen->h, -10, col);
}
}
}
if(knob.p.x > 0)
drawKnob(screen,knob);
if (knob.p.x > 0) {
drawKnob(screen, &knob);
}
SDL_UpdateWindowSurface(window);
}
void loop()
static void
loop(void)
{
SDL_Event event;
SDL_RWops *stream;
int i;
while(SDL_PollEvent(&event))
{
while (SDL_PollEvent(&event)) {
SDLTest_CommonEvent(state, &event, &quitting);
/* Record _all_ events */
events[eventWrite & (EVENT_BUF_SIZE-1)] = event;
eventWrite++;
switch (event.type)
{
switch (event.type) {
case SDL_KEYDOWN:
switch (event.key.keysym.sym)
{
case SDLK_i:
{
int i;
switch (event.key.keysym.sym) {
case SDLK_i: {
for (i = 0; i < SDL_GetNumTouchDevices(); ++i) {
SDL_TouchID id = SDL_GetTouchDevice(i);
const SDL_TouchID id = SDL_GetTouchDevice(i);
SDL_Log("Fingers Down on device %"SDL_PRIs64": %d", id, 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));
@ -207,43 +211,42 @@ void loop()
}
break;
case SDL_FINGERMOTION:
#if VERBOSE
case SDL_FINGERMOTION:
SDL_Log("Finger: %"SDL_PRIs64",x: %f, y: %f",event.tfinger.fingerId,
event.tfinger.x,event.tfinger.y);
#endif
break;
case SDL_FINGERDOWN:
#if VERBOSE
SDL_Log("Finger: %"SDL_PRIs64" down - x: %f, y: %f",
event.tfinger.fingerId,event.tfinger.x,event.tfinger.y);
#endif
break;
case SDL_FINGERUP:
#if VERBOSE
SDL_Log("Finger: %"SDL_PRIs64" up - x: %f, y: %f",
event.tfinger.fingerId,event.tfinger.x,event.tfinger.y);
#endif
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);
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);
event.dgesture.gestureId, event.dgesture.error);
break;
case SDL_DOLLARRECORD:
SDL_Log("Recorded gesture: %"SDL_PRIs64"",event.dgesture.gestureId);
break;
@ -265,9 +268,7 @@ void loop()
int main(int argc, char* argv[])
{
/* gesture variables */
knob.r = .1f;
knob.ang = 0;
int i;
/* !!! FIXME: there should be an SDLTest_CommonDefaultArgs() so apps don't need this. */
state = SDLTest_CommonCreateState(argv, SDL_INIT_VIDEO);