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Merge 1bc1d278eb7595181655e6e9754461718dc4b4e2 into dev

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github-actions[bot] 2020-11-09 15:11:28 +00:00 committed by GitHub
commit 2afd887fdf
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1 changed files with 15 additions and 3 deletions
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18
src/lv_draw/lv_draw_triangle.c
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@ -94,16 +94,28 @@ void lv_draw_polygon(const lv_point_t points[], uint16_t point_cnt, const lv_are
int32_t i_next_right;
uint32_t mask_cnt = 0;
/* Check if the order of points is inverted or not.
* The normal case is when the left point is on `y_min_i - 1`*/
/*Get the index of the left and right points*/
i_next_left = y_min_i - 1;
if(i_next_left < 0) i_next_left = point_cnt + i_next_left;
i_next_right = y_min_i + 1;
if(i_next_right > point_cnt - 1) i_next_right = 0;
/* Check if the order of points is inverted or not.
* The normal case is when the left point is on `y_min_i - 1`
* Explanation:
* if angle(p_left) < angle(p_right) -> inverted
* dy_left/dx_left < dy_right/dx_right
* dy_left * dx_right < dy_right * dx_left
*/
lv_coord_t dxl = points[i_next_left].x - points[y_min_i].x;
lv_coord_t dxr = points[i_next_right].x - points[y_min_i].x;
lv_coord_t dyl = points[i_next_left].y - points[y_min_i].y;
lv_coord_t dyr = points[i_next_right].y - points[y_min_i].y;
bool inv = false;
if(points[i_next_left].x > points[i_next_right].x && points[i_next_left].y < points[i_next_right].y) inv = true;
if(dyl*dxr < dyr*dxl) inv = true;
do {
if(!inv) {