mirror of
https://github.com/lvgl/lvgl.git
synced 2025-01-21 06:53:01 +08:00
add triangle drawing
This commit is contained in:
parent
4396e0e496
commit
ca45bfaf07
@ -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);
|
||||
|
||||
}
|
||||
|
||||
|
Loading…
x
Reference in New Issue
Block a user