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add triangle drawing

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This commit is contained in:
Gabor Kiss-Vamosi 2019-10-10 15:36:53 +02:00
parent 4396e0e496
commit ca45bfaf07
1 changed files with 74 additions and 0 deletions
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74
src/lv_draw/lv_draw_triangle.c
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@ -42,6 +42,80 @@
*/
void lv_draw_triangle(const lv_point_t * points, const lv_area_t * mask, const lv_style_t * style, lv_opa_t opa_scale)
{
lv_draw_mask_line_side_t side_right;
lv_draw_mask_line_side_t side_left;
lv_draw_mask_line_side_t side_bottom;
/*Find the lowest point*/
lv_coord_t y_min = points[0].y;
int8_t y_min_i = 0;
int8_t i;
for(i = 1; i < 3; i++) {
if(points[i].y < y_min) {
y_min = points[i].y;
y_min_i = i;
}
}
int8_t i_left;
int8_t i_right;
switch(y_min_i) {
case 0:
i_left = 1;
i_right = 2;
break;
case 1:
i_left = 0;
i_right = 2;
break;
case 2:
i_left = 0;
i_right = 1;
break;
}
if(points[i_right].x < points[y_min_i].x) {
int8_t tmp;
tmp = i_right;
i_right = i_left;
i_left = tmp;
}
if(points[y_min_i].y == points[i_right].y) side_right = LV_DRAW_MASK_LINE_SIDE_BOTTOM;
else side_right = LV_DRAW_MASK_LINE_SIDE_LEFT;
if(points[y_min_i].y == points[i_left].y) side_left = LV_DRAW_MASK_LINE_SIDE_BOTTOM;
else side_left = LV_DRAW_MASK_LINE_SIDE_RIGHT;
side_bottom = LV_DRAW_MASK_LINE_SIDE_TOP;
lv_draw_mask_param_t p_right;
lv_draw_mask_param_t p_left;
lv_draw_mask_param_t p_bottom;
lv_draw_mask_line_points_init(&p_right, points[y_min_i].x, points[y_min_i].y,
points[i_right].x, points[i_right].y, side_right);
lv_draw_mask_line_points_init(&p_left, points[y_min_i].x, points[y_min_i].y,
points[i_left].x, points[i_left].y, side_left);
lv_draw_mask_line_points_init(&p_bottom, points[i_left].x, points[i_left].y,
points[i_right].x, points[i_right].y, side_bottom);
int16_t id_right = lv_draw_mask_add(&p_right, NULL);
int16_t id_left = lv_draw_mask_add(&p_left, NULL);
int16_t id_bottom = lv_draw_mask_add(&p_bottom, NULL);
lv_draw_rect(mask, mask, style, opa_scale);
lv_draw_mask_remove_id(id_right);
lv_draw_mask_remove_id(id_left);
lv_draw_mask_remove_id(id_bottom);
}