Initial revision

Lib/lib-stdwin/Histogram.py

@@ -0,0 +1,49 @@
+# Module 'Histogram'
+
+from Buttons import *
+
+
+# A Histogram displays a histogram of numeric data.
+# It reacts to resize events by resizing itself,
+# leaving the same amount of space around the borders.
+#
+class HistogramAppearance() = LabelAppearance():
+	#
+	def define(self, (win, bounds, ydata, scale)):
+		self.init_appearance(win, bounds)
+		self.ydata = ydata
+		self.scale = scale # (min, max)
+		self.left_top, (right, bottom) = bounds
+		width, height = win.getwinsize()
+		self.right_margin = width - right
+		self.bottom_margin = height - bottom
+		return self
+	#
+	def setdata(self, (ydata, scale)):
+		self.ydata = ydata
+		self.scale = scale # (min, max)
+		self.win.change(self.bounds)
+	#
+	def drawit(self, d):
+		ydata = self.ydata
+		(left, top), (right, bottom) = self.bounds
+		min, max = self.scale
+		size = max-min
+		width, height = right-left, bottom-top
+		for i in range(len(ydata)):
+			h0 = left + i * width/len(ydata)
+			h1 = left + (i+1) * width/len(ydata)
+			v0 = top + height - (self.ydata[i]-min)*height/size
+			v1 = top + height
+			d.paint((h0, v0), (h1, v1))
+	#
+	def resize(self):
+		width, height = self.win.getwinsize()
+		right = width - self.right_margin
+		bottom = height - self.bottom_margin
+		self.setbounds(self.left_top, (right, bottom))
+	#
+
+class HistogramReactivity() = NoReactivity(): pass
+
+class Histogram() = HistogramAppearance(), HistogramReactivity(): pass