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Updated testjoystick.c for SDL2 API and draw more information.
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Fixes Bugzilla #1570.

Thanks to Ondra Hosek for the patch!
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@icculus
icculus committed Aug 16, 2012
1 parent 81bddac commit 0761be6
Showing 1 changed file with 83 additions and 28 deletions.
111 changes: 83 additions & 28 deletions test/testjoystick.c
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Expand Up @@ -12,15 +12,6 @@

/* Simple program to test the SDL joystick routines */

#if 1 /* FIXME: Rework this using the 2.0 API */
#include <stdio.h>

int main(int argc, char *argv[])
{
printf("FIXME\n");
return 0;
}
#else
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
Expand All @@ -35,23 +26,43 @@ int main(int argc, char *argv[])
#define SCREEN_HEIGHT 480
#endif

#define MAX_NUM_AXES 6
#define MAX_NUM_HATS 2

void
WatchJoystick(SDL_Joystick * joystick)
{
SDL_Surface *screen;
SDL_Window *window;
SDL_Renderer *screen;
const char *name;
int i, done;
SDL_Event event;
int x, y, draw;
SDL_Rect axis_area[6][2];
int x, y;
SDL_Rect axis_area[MAX_NUM_AXES][2];
int axis_draw[MAX_NUM_AXES];
SDL_Rect hat_area[MAX_NUM_HATS][2];
int hat_draw[MAX_NUM_HATS];
Uint8 hat_pos;

/* Set a video mode to display joystick axis position */
screen = SDL_SetVideoMode(SCREEN_WIDTH, SCREEN_HEIGHT, 16, 0);
/* Create a window to display joystick axis position */
window = SDL_CreateWindow("Joystick Test", SDL_WINDOWPOS_CENTERED,
SDL_WINDOWPOS_CENTERED, SCREEN_WIDTH,
SCREEN_HEIGHT, SDL_WINDOW_SHOWN);
if (window == NULL) {
fprintf(stderr, "Couldn't create window: %s\n", SDL_GetError());
return;
}

screen = SDL_CreateRenderer(window, -1, 0);
if (screen == NULL) {
fprintf(stderr, "Couldn't set video mode: %s\n", SDL_GetError());
fprintf(stderr, "Couldn't create renderer: %s\n", SDL_GetError());
SDL_DestroyWindow(window);
return;
}

SDL_SetRenderDrawColor(screen, 0x00, 0x00, 0x00, SDL_ALPHA_OPAQUE);
SDL_RenderClear(screen);

/* Print info about the joystick we are watching */
name = SDL_JoystickName(SDL_JoystickIndex(joystick));
printf("Watching joystick %d: (%s)\n", SDL_JoystickIndex(joystick),
Expand All @@ -62,7 +73,9 @@ WatchJoystick(SDL_Joystick * joystick)

/* Initialize drawing rectangles */
memset(axis_area, 0, (sizeof axis_area));
draw = 0;
memset(axis_draw, 0, (sizeof axis_draw));
memset(hat_area, 0, (sizeof hat_area));
memset(hat_draw, 0, (sizeof hat_draw));

/* Loop, getting joystick events! */
done = 0;
Expand Down Expand Up @@ -123,21 +136,24 @@ WatchJoystick(SDL_Joystick * joystick)
area.w = 32;
area.h = 32;
if (SDL_JoystickGetButton(joystick, i) == SDL_PRESSED) {
SDL_FillRect(screen, &area, 0xFFFF);
SDL_SetRenderDrawColor(screen, 0xFF, 0xFF, 0xFF, SDL_ALPHA_OPAQUE);
} else {
SDL_FillRect(screen, &area, 0x0000);
SDL_SetRenderDrawColor(screen, 0x00, 0x00, 0x00, SDL_ALPHA_OPAQUE);
}
SDL_UpdateRects(screen, 1, &area);
SDL_RenderFillRect(screen, &area);
SDL_RenderPresent(screen);
}

for (i = 0;
i < SDL_JoystickNumAxes(joystick) / 2
&& i < SDL_arraysize(axis_area); ++i) {

/* Erase previous axes */
SDL_FillRect(screen, &axis_area[i][draw], 0x0000);
SDL_SetRenderDrawColor(screen, 0x00, 0x00, 0x00, SDL_ALPHA_OPAQUE);
SDL_RenderFillRect(screen, &axis_area[i][axis_draw[i]]);

/* Draw the X/Y axis */
draw = !draw;
axis_draw[i] = !axis_draw[i];
x = (((int) SDL_JoystickGetAxis(joystick, i * 2 + 0)) + 32768);
x *= SCREEN_WIDTH;
x /= 65535;
Expand All @@ -155,15 +171,55 @@ WatchJoystick(SDL_Joystick * joystick)
y = SCREEN_HEIGHT - 16;
}

axis_area[i][draw].x = (Sint16) x;
axis_area[i][draw].y = (Sint16) y;
axis_area[i][draw].w = 16;
axis_area[i][draw].h = 16;
SDL_FillRect(screen, &axis_area[i][draw], 0xFFFF);
axis_area[i][axis_draw[i]].x = (Sint16) x;
axis_area[i][axis_draw[i]].y = (Sint16) y;
axis_area[i][axis_draw[i]].w = 16;
axis_area[i][axis_draw[i]].h = 16;

SDL_UpdateRects(screen, 2, axis_area[i]);
SDL_SetRenderDrawColor(screen, 0xFF, 0xFF, 0xFF, SDL_ALPHA_OPAQUE);
SDL_RenderFillRect(screen, &axis_area[i][axis_draw[i]]);
SDL_RenderPresent(screen);
}

for (i = 0;
i < SDL_JoystickNumHats(joystick)
&& i < SDL_arraysize(hat_area); ++i) {

/* Erase previous hat position */
SDL_SetRenderDrawColor(screen, 0x00, 0x00, 0x00, SDL_ALPHA_OPAQUE);
SDL_RenderFillRect(screen, &hat_area[i][hat_draw[i]]);

hat_draw[i] = !hat_draw[i];

/* Derive the new position */
hat_pos = SDL_JoystickGetHat(joystick, i);

hat_area[i][hat_draw[i]].x = SCREEN_WIDTH/2;
hat_area[i][hat_draw[i]].y = SCREEN_HEIGHT/2;
hat_area[i][hat_draw[i]].w = 8;
hat_area[i][hat_draw[i]].h = 8;

if (hat_pos & SDL_HAT_UP) {
hat_area[i][hat_draw[i]].y = 0;
} else if (hat_pos & SDL_HAT_DOWN) {
hat_area[i][hat_draw[i]].y = SCREEN_HEIGHT-8;
}

if (hat_pos & SDL_HAT_LEFT) {
hat_area[i][hat_draw[i]].x = 0;
} else if (hat_pos & SDL_HAT_RIGHT) {
hat_area[i][hat_draw[i]].x = SCREEN_WIDTH-8;
}

/* Draw it */
SDL_SetRenderDrawColor(screen, 0xFF, 0xFF, 0xFF, SDL_ALPHA_OPAQUE);
SDL_RenderFillRect(screen, &hat_area[i][hat_draw[i]]);
SDL_RenderPresent(screen);
}
}

SDL_DestroyRenderer(screen);
SDL_DestroyWindow(window);
}

int
Expand Down Expand Up @@ -211,4 +267,3 @@ main(int argc, char *argv[])

return (0);
}
#endif

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