mirror of https://github.com/encounter/SDL.git
303 lines
7.7 KiB
C
303 lines
7.7 KiB
C
/*
|
|
Copyright (C) 1997-2014 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"
|
|
|
|
#ifdef __EMSCRIPTEN__
|
|
#include <emscripten/emscripten.h>
|
|
#endif
|
|
|
|
#define WIDTH 640
|
|
#define HEIGHT 480
|
|
#define BPP 4
|
|
#define DEPTH 32
|
|
|
|
/* MUST BE A POWER OF 2! */
|
|
#define EVENT_BUF_SIZE 256
|
|
|
|
|
|
#define VERBOSE 0
|
|
|
|
static SDL_Event events[EVENT_BUF_SIZE];
|
|
static int eventWrite;
|
|
|
|
|
|
static int colors[7] = {0xFF,0xFF00,0xFF0000,0xFFFF00,0x00FFFF,0xFF00FF,0xFFFFFF};
|
|
|
|
SDL_Surface *screen;
|
|
SDL_bool quitting = SDL_FALSE;
|
|
|
|
typedef struct {
|
|
float x,y;
|
|
} Point;
|
|
|
|
typedef struct {
|
|
float ang,r;
|
|
Point p;
|
|
} Knob;
|
|
|
|
static Knob knob;
|
|
|
|
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;
|
|
float a;
|
|
|
|
if(x < 0 || x >= screen->w) return;
|
|
if(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);
|
|
|
|
|
|
*pixmem32 = colour;
|
|
}
|
|
|
|
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))))
|
|
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)
|
|
{
|
|
float tx,ty;
|
|
float 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++) {
|
|
setpix(screen,x+tx,y+ty,c);
|
|
}
|
|
}
|
|
else {
|
|
setpix(screen,x-xr+.5f,y+ty,c);
|
|
setpix(screen,x+xr-.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);
|
|
}
|
|
|
|
void DrawScreen(SDL_Surface* screen, SDL_Window* window)
|
|
{
|
|
int i;
|
|
#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;
|
|
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*(.1+.85))) | (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);
|
|
}
|
|
|
|
/* Returns a new SDL_Window if window is NULL or window if not. */
|
|
SDL_Window* initWindow(SDL_Window *window, int width,int height)
|
|
{
|
|
if (!window) {
|
|
window = SDL_CreateWindow("Gesture Test",
|
|
SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
|
|
width, height, SDL_WINDOW_RESIZABLE);
|
|
}
|
|
if (!window) {
|
|
return NULL;
|
|
}
|
|
return window;
|
|
}
|
|
|
|
void loop()
|
|
{
|
|
static SDL_Window *window = NULL;
|
|
SDL_Event event;
|
|
SDL_RWops *stream;
|
|
|
|
while(SDL_PollEvent(&event))
|
|
{
|
|
/* Record _all_ events */
|
|
events[eventWrite & (EVENT_BUF_SIZE-1)] = event;
|
|
eventWrite++;
|
|
|
|
switch (event.type)
|
|
{
|
|
case SDL_QUIT:
|
|
quitting = SDL_TRUE;
|
|
break;
|
|
case SDL_KEYDOWN:
|
|
switch (event.key.keysym.sym)
|
|
{
|
|
case SDLK_i:
|
|
{
|
|
int i;
|
|
for (i = 0; i < SDL_GetNumTouchDevices(); ++i) {
|
|
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));
|
|
SDL_RWclose(stream);
|
|
break;
|
|
case SDLK_ESCAPE:
|
|
quitting = SDL_TRUE;
|
|
break;
|
|
}
|
|
break;
|
|
case SDL_WINDOWEVENT:
|
|
if (event.window.event == SDL_WINDOWEVENT_RESIZED) {
|
|
if (!(window = initWindow(window, event.window.data1, event.window.data2)) ||
|
|
!(screen = SDL_GetWindowSurface(window)))
|
|
{
|
|
SDL_Quit();
|
|
exit(1);
|
|
}
|
|
}
|
|
break;
|
|
case SDL_FINGERMOTION:
|
|
#if VERBOSE
|
|
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;
|
|
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;
|
|
}
|
|
}
|
|
DrawScreen(screen);
|
|
}
|
|
|
|
int main(int argc, char* argv[])
|
|
{
|
|
|
|
/* Enable standard application logging */
|
|
SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
|
|
|
|
/* gesture variables */
|
|
knob.r = .1f;
|
|
knob.ang = 0;
|
|
|
|
if (SDL_Init(SDL_INIT_VIDEO) < 0 ) return 1;
|
|
|
|
if (!(screen = initScreen(WIDTH,HEIGHT)))
|
|
{
|
|
SDL_Quit();
|
|
return 1;
|
|
}
|
|
|
|
#ifdef __EMSCRIPTEN__
|
|
emscripten_set_main_loop(loop, 0, 1);
|
|
#else
|
|
while(!quitting) {
|
|
loop();
|
|
}
|
|
#endif
|
|
|
|
SDL_Quit();
|
|
return 0;
|
|
}
|
|
|