| # 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() |