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# Graph2D examples.
from ocempgui.widgets import *
from ocempgui.widgets.Constants import *
import Numeric, math
__function = "func_1"
def change(graph):
global __function
if __function == "func_1":
graph.eval_func = lambda x: x / ((- 3 * x**2.0 + 2) * math.e**x)
__function = "func_2"
else:
graph.eval_func = lambda x: x**4.0 - 3 * x**2.0 + 2 * x
__function = "func_1"
def create_graph2d_view ():
frame = VFrame (Label ("Graph2D"))
frame.topleft = 10, 10
# Create the graph.
graph = Graph2D (400, 400)
# Lock it, because we set some necessary information and want to
# avoid excessive update() calls.
graph.lock ()
# Scale units for the x and y axis.
graph.scale_units = ("cm", "kp")
# Point of origin.
graph.origin = 200, 200
# We want to see negative values.
graph.negative = True
# The evaluation function and data to use.
graph.eval_func = lambda x: x**4.0 - 3 * x**2.0 + 2 * x
graph.data = Numeric.arrayrange (-10, 10, .001).tolist()
# Done, unlock.
graph.unlock ()
button = Button ("Change function")
button.connect_signal (SIG_CLICKED, change, graph)
frame.add_child (graph, button)
return frame
if __name__ == "__main__":
# Initialize the drawing window.
re = Renderer ()
re.create_screen (450, 500)
re.title = "Graph2D examples"
re.color = (234, 228, 223)
re.add_widget (create_graph2d_view ())
# Start the main rendering loop.
re.start ()
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