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Pico_ePaper_Code/pythonNanoGui/gui/widgets/meter.py

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+# meter.py Meter class for nano-gui
+
+# Released under the MIT License (MIT). See LICENSE.
+# Copyright (c) 2018-2020 Peter Hinch
+
+from gui.core.nanogui import DObject
+from gui.widgets.label import Label
+
+
+class Meter(DObject):
+    BAR = 1
+    LINE = 0
+    def __init__(self, writer, row, col, *, height=50, width=10,
+                 fgcolor=None, bgcolor=None, ptcolor=None, bdcolor=None,
+                 divisions=5, label=None, style=0, legends=None, value=None):
+        super().__init__(writer, row, col, height, width, fgcolor, bgcolor, bdcolor)
+        self.divisions = divisions
+        if label is not None:
+            Label(writer, row + height + 3, col, label)
+        self.style = style
+        if legends is not None: # Legends
+            x = col + width + 4
+            y = row + height
+            dy = 0 if len(legends) <= 1 else height / (len(legends) -1)
+            yl = y - writer.height / 2 # Start at bottom
+            for legend in legends:
+                Label(writer, int(yl), x, legend)
+                yl -= dy
+        self.ptcolor = ptcolor if ptcolor is not None else self.fgcolor
+        self.value(value)
+
+    def value(self, n=None, color=None):
+        if n is None:
+            return super().value()
+        n = super().value(min(1, max(0, n)))
+        if color is not None:
+            self.ptcolor = color
+        self.show()
+        return n
+        
+    def show(self):
+        super().show()  # Draw or erase border
+        val = super().value()
+        wri = self.writer
+        dev = self.device
+        width = self.width
+        height = self.height
+        x0 = self.col
+        x1 = self.col + width
+        y0 = self.row
+        y1 = self.row + height
+        if self.divisions > 0:
+            dy = height / (self.divisions) # Tick marks
+            for tick in range(self.divisions + 1):
+                ypos = int(y0 + dy * tick)
+                dev.hline(x0 + 2, ypos, x1 - x0 - 4, self.fgcolor)
+
+        y = int(y1 - val * height) # y position of slider
+        if self.style == self.LINE:
+            dev.hline(x0, y, width, self.ptcolor) # Draw pointer
+        else:
+            w = width / 2
+            dev.fill_rect(int(x0 + w - 2), y, 4, y1 - y, self.ptcolor)