example0.c

#include "../src/wasm.h"
#include "../src/wefx.h"
#include "../src/events.h"

/*
 * - the bottom-left is (0,0) and the pixel coordinates increase
 * in the right and up directions
 * - the pixel centers have integer coordinates.
 */
#define W 105
#define H 50

// Called once at startup
// note: memory not initialized yet so 'print' will not work
EXPORT int init(void)
{
    // Open a "window"
    int err = wefx_open(W, H, "Logo Window");
    if (err)
        return 1;

    // enable mouse and keyboard events
    if (wefx_open_events() == NULL)
        return 1;

    wefx_clear_color(0x00, 0x00, 0x00);
    wefx_color(0xff, 0xff, 0xff);
    wefx_clear();
    srand(9999991);

    return 0;
}

// Handle input each frame
void input(int time, wefx_event_queue *wefx_q)
{
    if (wefx_q == NULL)
        return;

    // we need to at least drain the event queue
    // or we'll eventually run out of memory
    wefx_event *e = wefx_dequeue(wefx_q);
    switch (e->type)
    {
    case WEFX_MOUSEDOWN:
        wefx_clear_color(rand() % 0xff, rand() % 0xff, rand() & 0xff);
        break;
    case WEFX_KEYDOWN:
        if (e->key == 0)
            break;
        if (e->key == 'a')
        {
            wefx_clear_color(rand() % 0xff, rand() % 0xff, rand() & 0xff);
        }
        break;
    default:
        break;
    }
    // Dodgy, but javascript creates this when it makes
    // the event so we need to free the event here.
    free(e);
}

// Draw to our screen buffer
void draw(int time)
{
    wefx_clear();
    wefx_color(rand() % 0xff, rand() % 0xff, rand() & 0xff);

    // W
    wefx_line(15, 35, 20, 15);
    wefx_line(20, 15, 22, 25);
    wefx_line(22, 25, 25, 15);
    wefx_line(25, 15, 30, 35);
    // E
    wefx_line(50, 15, 35, 15);
    wefx_line(45, 25, 35, 25);
    wefx_line(50, 35, 35, 35);
    wefx_line(35, 15, 35, 35);
    // F
    wefx_line(70, 35, 55, 35);
    wefx_line(65, 25, 55, 25);
    wefx_line(55, 35, 55, 15);
    // // X
    wefx_line(75, 15, 90, 35);
    wefx_line(90, 15, 75, 35);
}

// Called every frame
EXPORT void main_loop(float time, wefx_event_queue *wefx_q)
{
    int itime = (int)time;
    input(itime, wefx_q);
    draw(itime);
}