circuitpython/shared-module/vectorio/Circle.c

#include "shared-bindings/vectorio/Circle.h"
#include "shared-module/vectorio/__init__.h"
#include "shared-module/displayio/area.h"

#include "py/runtime.h"
#include "stdlib.h"


void common_hal_vectorio_circle_construct(vectorio_circle_t *self, uint16_t radius) {
    self->radius = radius;
    self->on_dirty.obj = NULL;
}

void common_hal_vectorio_circle_set_on_dirty(vectorio_circle_t *self, vectorio_event_t on_dirty) {
    if (self->on_dirty.obj != NULL) {
        mp_raise_TypeError(translate("circle can only be registered in one parent"));
    }
    self->on_dirty = on_dirty;
}


uint32_t common_hal_vectorio_circle_get_pixel(void *obj, int16_t x, int16_t y) {
    vectorio_circle_t *self = obj;
    int16_t radius = abs(self->radius);
    x = abs(x);
    y = abs(y);
    if (x+y <= radius) return 1;
    if (x > radius) return 0;
    if (y > radius) return 0;
    const bool pythagorasSmallerThanRadius = (int32_t)x*x + (int32_t)y*y <= (int32_t)radius*radius;
    return pythagorasSmallerThanRadius ? 1 : 0;
}


void common_hal_vectorio_circle_get_area(void *circle, displayio_area_t *out_area) {
    vectorio_circle_t *self = circle;
    out_area->x1 = -1 * self->radius - 1;
    out_area->y1 = -1 * self->radius - 1;
    out_area->x2 = self->radius + 1;
    out_area->y2 = self->radius + 1;
}

int16_t common_hal_vectorio_circle_get_radius(void *obj) {
    vectorio_circle_t *self = obj;
    return self->radius;
}

void common_hal_vectorio_circle_set_radius(void *obj, int16_t radius) {
    vectorio_circle_t *self = obj;
    self->radius = abs(radius);
    if (self->on_dirty.obj != NULL) {
        self->on_dirty.event(self->on_dirty.obj);
    }
}