def draw_event_cb(e):
obj = e.get_target()
cont_a = lv.area_t()
obj.get_coords(cont_a)
#Add the faded area before the lines are drawn
dsc = e.get_draw_part_dsc()
if dsc.part == lv.PART.ITEMS:
if not dsc.p1 or not dsc.p2:
return
# Add a line mask that keeps the area below the line
line_mask_param = lv.draw_mask_line_param_t()
line_mask_param.points_init(dsc.p1.x, dsc.p1.y, dsc.p2.x, dsc.p2.y,
lv.DRAW_MASK_LINE_SIDE.BOTTOM)
line_mask_id = lv.draw_mask_add(line_mask_param, None)
#Draw a rectangle that will be affected by the mask
draw_rect_dsc = lv.draw_rect_dsc_t()
draw_rect_dsc.init()
draw_rect_dsc.bg_opa = lv.OPA.COVER
draw_rect_dsc.bg_color = dsc.line_dsc.color
a = lv.area_t()
a.x1 = dsc.p1.x
a.x2 = dsc.p2.x
a.y1 = min(dsc.p1.y, dsc.p2.y)
a.y2 = cont_a.y2 - 13 # -13 cuts off where the rectangle draws over the chart margin. Without this an area of 0 doesn't look like 0
dsc.draw_ctx.rect(draw_rect_dsc, a)
# Remove the mask
lv.draw_mask_free_param(line_mask_param)
lv.draw_mask_remove_id(line_mask_id)
def draw_event_cb(e):
obj = lv.obj.__cast__(e.get_target())
# Add the faded area before the lines are drawn
dsc = lv.obj_draw_part_dsc_t.cast(e.get_param())
if dsc.part != lv.PART.ITEMS:
return
if not dsc.p1 or not dsc.p2:
return
# Add a line mask that keeps the area below the line
line_mask_param = lv.draw_mask_line_param_t()
line_mask_param.points_init(dsc.p1.x, dsc.p1.y, dsc.p2.x, dsc.p2.y,
lv.DRAW_MASK_LINE_SIDE.BOTTOM)
# line_mask_id = line_mask_param.draw_mask_add(None)
line_mask_id = lv.draw_mask_add(line_mask_param, None)
# Add a fade effect: transparent bottom covering top
h = obj.get_height()
fade_mask_param = lv.draw_mask_fade_param_t()
coords = lv.area_t()
obj.get_coords(coords)
fade_mask_param.init(coords, lv.OPA.COVER, coords.y1 + h // 8,
lv.OPA.TRANSP, coords.y2)
fade_mask_id = lv.draw_mask_add(fade_mask_param, None)
# Draw a rectangle that will be affected by the mask
draw_rect_dsc = lv.draw_rect_dsc_t()
draw_rect_dsc.init()
draw_rect_dsc.bg_opa = lv.OPA._20
draw_rect_dsc.bg_color = dsc.line_dsc.color
a = lv.area_t()
a.x1 = dsc.p1.x
a.x2 = dsc.p2.x - 1
a.y1 = min(dsc.p1.y, dsc.p2.y)
coords = lv.area_t()
obj.get_coords(coords)
a.y2 = coords.y2
lv.draw_rect(a, dsc.clip_area, draw_rect_dsc)
# Remove the masks
lv.draw_mask_remove_id(line_mask_id)
lv.draw_mask_remove_id(fade_mask_id)
while lv.tick_elaps(t) < 1000:
pass
a.x1 = 100
a.y1 = 100
a.x2 = 150
a.y2 = 150
r1.init(a, lv.RADIUS.CIRCLE, True)
om.add_mask(r1)
lv.refr_now(None)
t = lv.tick_get()
while lv.tick_elaps(t) < 1000:
pass
l1 = lv.draw_mask_line_param_t()
l1.points_init(0, 0, 100, 200, lv.DRAW_MASK_LINE_SIDE.TOP)
om.add_mask(l1)
lv.refr_now(None)
t = lv.tick_get()
while lv.tick_elaps(t) < 1000:
pass
f1 = lv.draw_mask_fade_param_t()
a.x1 = 100
a.y1 = 0
a.x2 = 200
a.y2 = 200
f1.init(a, lv.OPA.TRANSP, 0, lv.OPA.COVER, 150)
om.add_mask(f1)
