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#include "shared-module/vectorio/__init__.h"
#include "shared-bindings/vectorio/Polygon.h"
#include "shared-module/displayio/area.h"
#include "py/runtime.h"
#include "stdlib.h"
#include <stdio.h>
#define VECTORIO_POLYGON_DEBUG(...) (void)0
// #define VECTORIO_POLYGON_DEBUG(...) mp_printf(&mp_plat_print __VA_OPT__(,) __VA_ARGS__)
void common_hal_vectorio_polygon_construct(vectorio_polygon_t *self, mp_obj_t points_list) {
VECTORIO_POLYGON_DEBUG("%p polygon_construct\n", self);
self->points_list = points_list;
self->on_dirty.obj = NULL;
}
mp_obj_t common_hal_vectorio_polygon_get_points(vectorio_polygon_t *self) {
return self->points_list;
}
void common_hal_vectorio_polygon_set_points(vectorio_polygon_t *self, mp_obj_t points_list) {
self->points_list = points_list;
if (self->on_dirty.obj != NULL) {
self->on_dirty.event(self->on_dirty.obj);
}
}
void common_hal_vectorio_polygon_set_on_dirty(vectorio_polygon_t *self, vectorio_event_t notification) {
if ( self->on_dirty.obj != NULL ) {
mp_raise_TypeError(translate("polygon can only be registered in one parent"));
}
self->on_dirty = notification;
}
void common_hal_vectorio_polygon_get_area(void *polygon, displayio_area_t *area) {
VECTORIO_POLYGON_DEBUG("%p polygon get_area", polygon);
vectorio_polygon_t *self = polygon;
size_t len;
mp_obj_t *points;
mp_obj_list_get(self->points_list, &len, &points);
VECTORIO_POLYGON_DEBUG(" len: %2d, points: %d\n", len, len/2);
area->x1 = SHRT_MAX;
area->y1 = SHRT_MAX;
area->x2 = SHRT_MIN;
area->y2 = SHRT_MIN;
for (size_t i=0; i < len; ++i) {
mp_int_t x = mp_obj_get_int(points[i]);
++i;
mp_int_t y = mp_obj_get_int(points[i]);
if (x <= area->x1) area->x1 = x-1;
if (y <= area->y1) area->y1 = y-1;
if (x >= area->x2) area->x2 = x+1;
if (y >= area->y2) area->y2 = y+1;
}
}
// <0 if the point is to the left of the line vector
// 0 if the point is on the line
// >0 if the point is to the right of the line vector
__attribute__((always_inline)) static inline int line_side( mp_int_t x1, mp_int_t y1, mp_int_t x2, mp_int_t y2, int16_t px, int16_t py ) {
return (px - x1) * (y2 - y1)
- (py - y1) * (x2 - x1);
}
uint32_t common_hal_vectorio_polygon_get_pixel(void *obj, int16_t x, int16_t y) {
VECTORIO_POLYGON_DEBUG("%p polygon get_pixel %d, %d\n", obj, x, y);
vectorio_polygon_t *self = obj;
size_t len;
mp_obj_t *points;
mp_obj_list_get(self->points_list, &len, &points);
if (len == 0) {
return 0;
}
int winding_number = 0;
mp_int_t x1 = mp_obj_get_int(points[0]);
mp_int_t y1 = mp_obj_get_int(points[1]);
for (size_t i=2; i <= len + 1; ++i) {
VECTORIO_POLYGON_DEBUG(" {(%3d, %3d),", x1, y1);
mp_int_t x2 = mp_obj_get_int(points[i % len]);
++i;
mp_int_t y2 = mp_obj_get_int(points[i % len]);
VECTORIO_POLYGON_DEBUG(" (%3d, %3d)}\n", x2, y2);
if ( y1 <= y ) {
if ( y2 > y && line_side(x1, y1, x2, y2, x, y) > 0 ) {
// Wind up, point is to the right of the edge vector
++winding_number;
VECTORIO_POLYGON_DEBUG(" wind:%2d winding_number:%2d\n", 1, winding_number);
}
} else if ( y2 <= y && line_side(x1, y1, x2, y2, x, y) < 0 ) {
// Wind down, point is to the left of the edge vector
--winding_number;
VECTORIO_POLYGON_DEBUG(" wind:%2d winding_number:%2d\n", -1, winding_number);
}
x1 = x2;
y1 = y2;
}
return winding_number == 0 ? 0 : 1;
}
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