mirror of
https://github.com/libsdl-org/SDL.git
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310 lines
7.9 KiB
C
310 lines
7.9 KiB
C
/*
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Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely.
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*/
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/* Usage:
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* Spacebar to begin recording a gesture on all touches.
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* s to save all touches into "./gestureSave"
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* l to load all touches from "./gestureSave"
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*/
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#include "SDL.h"
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#include <stdlib.h> /* for exit() */
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#ifdef __EMSCRIPTEN__
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#include <emscripten/emscripten.h>
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#endif
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#define WIDTH 640
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#define HEIGHT 480
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#define BPP 4
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/* MUST BE A POWER OF 2! */
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#define EVENT_BUF_SIZE 256
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#define VERBOSE 0
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static SDL_Event events[EVENT_BUF_SIZE];
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static int eventWrite;
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static int colors[7] = {0xFF,0xFF00,0xFF0000,0xFFFF00,0x00FFFF,0xFF00FF,0xFFFFFF};
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SDL_Surface *screen;
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SDL_Window *window;
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SDL_bool quitting = SDL_FALSE;
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typedef struct {
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float x,y;
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} Point;
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typedef struct {
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float ang,r;
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Point p;
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} Knob;
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static Knob knob;
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void setpix(SDL_Surface *screen, float _x, float _y, unsigned int col)
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{
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Uint32 *pixmem32;
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Uint32 colour;
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Uint8 r,g,b;
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int x = (int)_x;
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int y = (int)_y;
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float a;
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if(x < 0 || x >= screen->w) return;
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if(y < 0 || y >= screen->h) return;
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pixmem32 = (Uint32*) screen->pixels + y*screen->pitch/BPP + x;
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SDL_memcpy(&colour,pixmem32,screen->format->BytesPerPixel);
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SDL_GetRGB(colour,screen->format,&r,&g,&b);
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/* r = 0;g = 0; b = 0; */
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a = (float)((col>>24)&0xFF);
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if(a == 0) a = 0xFF; /* Hack, to make things easier. */
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a /= 0xFF;
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r = (Uint8)(r*(1-a) + ((col>>16)&0xFF)*(a));
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g = (Uint8)(g*(1-a) + ((col>> 8)&0xFF)*(a));
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b = (Uint8)(b*(1-a) + ((col>> 0)&0xFF)*(a));
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colour = SDL_MapRGB( screen->format,r, g, b);
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*pixmem32 = colour;
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}
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void drawLine(SDL_Surface *screen,float x0,float y0,float x1,float y1,unsigned int col) {
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float t;
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for(t=0;t<1;t+=(float)(1.f/SDL_max(SDL_fabs(x0-x1),SDL_fabs(y0-y1))))
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setpix(screen,x1+t*(x0-x1),y1+t*(y0-y1),col);
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}
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void drawCircle(SDL_Surface* screen,float x,float y,float r,unsigned int c)
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{
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float tx,ty;
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float xr;
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for(ty = (float)-SDL_fabs(r);ty <= (float)SDL_fabs((int)r);ty++) {
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xr = (float)SDL_sqrt(r*r - ty*ty);
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if(r > 0) { /* r > 0 ==> filled circle */
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for(tx=-xr+.5f;tx<=xr-.5;tx++) {
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setpix(screen,x+tx,y+ty,c);
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}
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}
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else {
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setpix(screen,x-xr+.5f,y+ty,c);
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setpix(screen,x+xr-.5f,y+ty,c);
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}
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}
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}
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void drawKnob(SDL_Surface* screen,Knob k) {
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drawCircle(screen,k.p.x*screen->w,k.p.y*screen->h,k.r*screen->w,0xFFFFFF);
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drawCircle(screen,(k.p.x+k.r/2*SDL_cosf(k.ang))*screen->w,
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(k.p.y+k.r/2*SDL_sinf(k.ang))*screen->h,k.r/4*screen->w,0);
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}
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void DrawScreen(SDL_Surface* screen, SDL_Window* window)
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{
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int i;
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#if 1
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SDL_FillRect(screen, NULL, 0);
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#else
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int x, y;
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for(y = 0;y < screen->h;y++)
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for(x = 0;x < screen->w;x++)
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setpix(screen,(float)x,(float)y,((x%255)<<16) + ((y%255)<<8) + (x+y)%255);
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#endif
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/* draw Touch History */
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for(i = eventWrite; i < eventWrite+EVENT_BUF_SIZE; ++i) {
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const SDL_Event *event = &events[i&(EVENT_BUF_SIZE-1)];
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float age = (float)(i - eventWrite) / EVENT_BUF_SIZE;
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float x, y;
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unsigned int c, col;
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if(event->type == SDL_FINGERMOTION ||
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event->type == SDL_FINGERDOWN ||
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event->type == SDL_FINGERUP) {
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x = event->tfinger.x;
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y = event->tfinger.y;
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/* draw the touch: */
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c = colors[event->tfinger.fingerId%7];
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col = ((unsigned int)(c*(.1+.85))) | (unsigned int)(0xFF*age)<<24;
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if(event->type == SDL_FINGERMOTION)
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drawCircle(screen,x*screen->w,y*screen->h,5,col);
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else if(event->type == SDL_FINGERDOWN)
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drawCircle(screen,x*screen->w,y*screen->h,-10,col);
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}
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}
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if(knob.p.x > 0)
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drawKnob(screen,knob);
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SDL_UpdateWindowSurface(window);
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}
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/* Returns a new SDL_Window if window is NULL or window if not. */
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SDL_Window* initWindow(SDL_Window *window, int width,int height)
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{
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if (!window) {
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window = SDL_CreateWindow("Gesture Test",
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SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
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width, height, SDL_WINDOW_RESIZABLE);
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}
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return window;
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}
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void loop()
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{
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SDL_Event event;
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SDL_RWops *stream;
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while(SDL_PollEvent(&event))
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{
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/* Record _all_ events */
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events[eventWrite & (EVENT_BUF_SIZE-1)] = event;
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eventWrite++;
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switch (event.type)
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{
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case SDL_QUIT:
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quitting = SDL_TRUE;
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break;
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case SDL_KEYDOWN:
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switch (event.key.keysym.sym)
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{
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case SDLK_i:
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{
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int i;
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for (i = 0; i < SDL_GetNumTouchDevices(); ++i) {
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SDL_TouchID id = SDL_GetTouchDevice(i);
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SDL_Log("Fingers Down on device %"SDL_PRIs64": %d", id, SDL_GetNumTouchFingers(id));
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}
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break;
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}
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case SDLK_SPACE:
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SDL_RecordGesture(-1);
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break;
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case SDLK_s:
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stream = SDL_RWFromFile("gestureSave", "w");
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SDL_Log("Wrote %i templates", SDL_SaveAllDollarTemplates(stream));
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SDL_RWclose(stream);
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break;
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case SDLK_l:
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stream = SDL_RWFromFile("gestureSave", "r");
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SDL_Log("Loaded: %i", SDL_LoadDollarTemplates(-1, stream));
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SDL_RWclose(stream);
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break;
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case SDLK_ESCAPE:
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quitting = SDL_TRUE;
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break;
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}
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break;
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case SDL_WINDOWEVENT:
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if (event.window.event == SDL_WINDOWEVENT_RESIZED) {
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if (!(window = initWindow(window, event.window.data1, event.window.data2)) ||
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!(screen = SDL_GetWindowSurface(window)))
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{
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SDL_Quit();
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exit(1);
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}
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}
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break;
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case SDL_FINGERMOTION:
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#if VERBOSE
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SDL_Log("Finger: %"SDL_PRIs64",x: %f, y: %f",event.tfinger.fingerId,
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event.tfinger.x,event.tfinger.y);
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#endif
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break;
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case SDL_FINGERDOWN:
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#if VERBOSE
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SDL_Log("Finger: %"SDL_PRIs64" down - x: %f, y: %f",
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event.tfinger.fingerId,event.tfinger.x,event.tfinger.y);
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#endif
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break;
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case SDL_FINGERUP:
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#if VERBOSE
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SDL_Log("Finger: %"SDL_PRIs64" up - x: %f, y: %f",
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event.tfinger.fingerId,event.tfinger.x,event.tfinger.y);
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#endif
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break;
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case SDL_MULTIGESTURE:
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#if VERBOSE
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SDL_Log("Multi Gesture: x = %f, y = %f, dAng = %f, dR = %f",
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event.mgesture.x,
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event.mgesture.y,
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event.mgesture.dTheta,
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event.mgesture.dDist);
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SDL_Log("MG: numDownTouch = %i",event.mgesture.numFingers);
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#endif
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knob.p.x = event.mgesture.x;
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knob.p.y = event.mgesture.y;
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knob.ang += event.mgesture.dTheta;
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knob.r += event.mgesture.dDist;
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break;
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case SDL_DOLLARGESTURE:
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SDL_Log("Gesture %"SDL_PRIs64" performed, error: %f",
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event.dgesture.gestureId,
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event.dgesture.error);
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break;
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case SDL_DOLLARRECORD:
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SDL_Log("Recorded gesture: %"SDL_PRIs64"",event.dgesture.gestureId);
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break;
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}
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}
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DrawScreen(screen, window);
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#ifdef __EMSCRIPTEN__
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if (quitting) {
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emscripten_cancel_main_loop();
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}
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#endif
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}
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int main(int argc, char* argv[])
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{
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window = NULL;
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screen = NULL;
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quitting = SDL_FALSE;
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/* Enable standard application logging */
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SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
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/* gesture variables */
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knob.r = .1f;
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knob.ang = 0;
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if (SDL_Init(SDL_INIT_VIDEO) < 0 ) return 1;
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if (!(window = initWindow(window, WIDTH, HEIGHT)) ||
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!(screen = SDL_GetWindowSurface(window)))
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{
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SDL_Quit();
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return 1;
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}
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#ifdef __EMSCRIPTEN__
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emscripten_set_main_loop(loop, 0, 1);
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#else
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while(!quitting) {
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loop();
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}
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#endif
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SDL_Quit();
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return 0;
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}
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