for i in range(total_ticks + 1):
x_start = sparkline1.x - 5
x_end = sparkline1.x
y_both = int(round(sparkline1.y + (i * (chart_height) / (total_ticks))))
if y_both > sparkline1.y + chart_height - 1:
y_both = sparkline1.y + chart_height - 1
my_group.append(Line(x_start, y_both, x_end, y_both, color=line_color))
# Set the display to show my_group that contains the sparkline and other graphics
display.show(my_group)
# Start the main loop
while True:
# Turn off auto_refresh to prevent partial updates of the screen during updates
# of the sparkline drawing
display.auto_refresh = False
# add_value: add a new value to a sparkline
# Note: The y-range for mySparkline1 is set to 0 to 10, so all these random
# values (between 0 and 10) will fit within the visible range of this sparkline
sparkline1.add_value(random.uniform(0, 10))
# Turn on auto_refresh for the display
display.auto_refresh = True
# The display seems to be less jittery if a small sleep time is provided
# You can adjust this to see if it has any effect
time.sleep(0.01)
# sparklines
display.show(my_group)
i = 0 # This is a counter for changing the random values for mySparkline3
# Start the main loop
while True:
# Turn off auto_refresh to prevent partial updates of the screen during updates
# of the sparklines
display.auto_refresh = False
# add_value: add a new value to a sparkline
# Note: The y-range for sparkline1 is set to -1 to 1.25, so all these random
# values (between 0 and 1) will fit within the visible range of this sparkline
sparkline1.add_value(random.uniform(0, 1))
# Note: For sparkline2, the y-axis range is set from 0 to 1.
# With the random values set between -1 and +2, the values will sometimes
# be out of the y-range. This example shows how the fixed y-range (0 to 1)
# will "clip" values (it will not display them) that are above or below the
# y-range.
sparkline2.add_value(random.uniform(-1, 2))
# sparkline3 is set autoranging for both the top and bottom of the Y-axis
# In this example, for 15 values, this adds points in the range from 0 to 1.
# Then, for the next 15 values, it adds points in the range of 0 to 10.
# This is to highlight the autoranging of the y-axis.
# Notice how the y-axis labels show that the y-scale is changing.
#
class SparkLineView(View):
def __init__(self, display, layout_json):
self.json = layout_json
if "view_type" not in layout_json:
raise MissingTypeError
if layout_json["view_type"] != "SparkLine":
raise IncorrectTypeError(
"view_type '{}' does not match Layout Class 'SparkLine'".
format(layout_json["view_type"]))
self._display = display
if "attributes" in layout_json:
_missing_attrs = []
for attribute in REQUIRED_ATTRIBUTES:
if attribute not in layout_json['attributes']:
_missing_attrs.append(attribute)
if len(_missing_attrs) > 0:
raise MissingRequiredAttributesError(
"Missing required attributes: {}".format(_missing_attrs))
_color = 0xFFFFFF
if "color" in layout_json["attributes"]:
_outline = int(layout_json["attributes"]["color"], 16)
_width = 0
if "width" in layout_json["attributes"]:
_width = self.keyword_compiler(
layout_json["attributes"]["width"])
_height = 0
if "height" in layout_json["attributes"]:
_height = self.keyword_compiler(
layout_json["attributes"]["height"])
_y_min = None
if "y_min" in layout_json["attributes"]:
_y_min = self.keyword_compiler(
layout_json["attributes"]["y_min"])
_x_min = None
if "x_min" in layout_json["attributes"]:
_x_min = self.keyword_compiler(
layout_json["attributes"]["x_min"])
_max_items = 10
if "max_items" in layout_json["attributes"]:
_max_items = self.keyword_compiler(
layout_json["attributes"]["max_items"])
_x = 0
if "x" in layout_json["attributes"]:
_x = self.keyword_compiler(layout_json["attributes"]["x"], {
"WIDTH": _width,
"HEIGHT": _height
})
_y = 0
if "y" in layout_json["attributes"]:
_y = self.keyword_compiler(layout_json["attributes"]["y"], {
"WIDTH": _width,
"HEIGHT": _height
})
_points = None
if "points" in layout_json["attributes"]:
_points = layout_json["attributes"]["points"]
self.sparkline = Sparkline(_width,
_height,
_max_items,
y_min=_y_min,
y_max=_x_min,
x=_x,
y=_y,
color=_color)
if _points != None:
for _point in _points:
self.sparkline.add_value(_point)
self.view = self.sparkline
else:
raise MissingAttributesError()