ptk/examples/button.c

#include <stdlib.h>
#include <ptk.h>
#include <ptk_color.h>
#include <ptk_log.h>

static const float step = 5.0f;
static float hue = 360.0f;

static PtkRect *r;

static void on_press(const int button, const int mods) {
    (void)button; (void)mods;
    PTK_DEBUG("pressed!");

    hue += step;
    if (hue > 360.0f) {
        hue = 0.0f;
    }

    r->color = ptk_hsv_to_rgb((PtkHSV){ .h = hue, .s = 360.0f, .v = 360.0f });
}

int main(void) {
    if (!ptk_init(800, 600, "button", (PtkVersion){ .major = 0, .minor = 1, .patch = 0 })) {
        return EXIT_FAILURE;
    }

    r = (PtkRect *)ptk_rect(
        (PtkPos){ .x = 100.0f, .y = 100.0f },
        (PtkSize){ .w = 100.0f, .h = 50.0f },
        (PtkRGB){ .r = 1.0f, .g = 0.0f, .b = 0.0f }
    );

    return ptk_run(
        ptk_clickable((PtkHandle)r, on_press)
    );
}