Tide: Anzeige erster Testdaten

pages/tide.py

@@ -1,8 +1,7 @@
 """
 
-NAVTEX
- - Meldungen anzeigen
-
+Tide Vorausschau
+ 
 """
 
 import cairo
@@ -25,6 +24,9 @@ class Tide(Page):
         ctx.set_font_size(16)
         ctx.set_line_width(2)
 
+        ctx.move_to(220, 40)
+        ctx.show_text("Schulau, Elbe")
+
         x0 = 40 # links unten
         y0 = 250
         x1 = 380 # rechts oben
@@ -48,3 +50,28 @@ class Tide(Page):
         self.draw_text_center(ctx, x0 + (x1 - x0) / 2, y0 + 12, "Zeit, h")
         ctx.stroke()
 
+        ymin, ymax = self.app.web.get_tide_minmax()
+        rawdata = self.app.web.get_tide()
+
+        ctx.move_to(x0 - 32, y0 + 8)
+        ctx.show_text(str(ymin))
+
+        ctx.move_to(x0 - 32, y1 + 8)
+        ctx.show_text(str(ymax))
+
+        ctx.move_to(x0 + 16, y0 + 16)
+        ctx.show_text(f"n = {len(rawdata)}")
+
+        dx = (x1 - x0) / len(rawdata)
+        x = x0
+        while rawdata[0][0] is None:
+            x += dx
+            del rawdata[0]
+        y = (rawdata[0][0] - ymin) / (ymax - ymin) * (y0 - y1)
+        ctx.move_to(x, y0 - (rawdata[0][0] - ymin))
+        del rawdata[0]
+        x += dx 
+        for val in rawdata:
+            y = (val[0] - ymin) / (ymax - ymin) * (y0 - y1)
+            ctx.line_to(x, y0 - y)
+            x += dx