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# Module 'StripChart'
import rect
from Buttons import LabelAppearance, NoReactivity
# A StripChart doesn't really look like a label but it needs a base class.
# LabelAppearance allows it to be disabled and hilited.
class StripChart(LabelAppearance, NoReactivity):
#
def define(self, parent, scale):
self.parent = parent
parent.addchild(self)
self.init_appearance()
self.init_reactivity()
self.ydata = []
self.scale = scale
self.resetbounds()
return self
#
def destroy(self):
self.parent = 0
#
def setbounds(self, bounds):
LabelAppearance.setbounds(self, bounds)
self.resetbounds()
#
def resetbounds(self):
(left, top), (right, bottom) = self.bounds
self.width = right-left
self.height = bottom-top
excess = len(self.ydata) - self.width
if excess > 0:
del self.ydata[:excess]
elif excess < 0:
while len(self.ydata) < self.width:
self.ydata.insert(0, 0)
#
def append(self, y):
self.ydata.append(y)
excess = len(self.ydata) - self.width
if excess > 0:
del self.ydata[:excess]
if self.bounds <> rect.empty:
self.parent.scroll(self.bounds, (-excess, 0))
if self.bounds <> rect.empty:
(left, top), (right, bottom) = self.bounds
i = len(self.ydata)
area = (left+i-1, top), (left+i, bottom)
self.draw(self.parent.begindrawing(), area)
#
def draw(self, d, area):
area = rect.intersect([area, self.bounds])
if area == rect.empty:
return
d.cliprect(area)
d.erase(self.bounds)
(a_left, a_top), (a_right, a_bottom) = area
(left, top), (right, bottom) = self.bounds
height = bottom - top
i1 = a_left - left
i2 = a_right - left
for i in range(max(0, i1), min(len(self.ydata), i2)):
split = bottom-self.ydata[i]*height/self.scale
d.paint((left+i, split), (left+i+1, bottom))
if not self.enabled:
self.flipenable(d)
if self.hilited:
self.fliphilite(d)
d.noclip()
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