added tooltips

speed_map_display.py

@@ -10,6 +10,8 @@ from vec import Vec2
 
 
 class SpeedMapDisplay(MapDisplay):
+    APP_NAME = "Train Journey - Speed Map Display"
+
     def __init__(self,
                  surf: pygame.Surface,
                  min_lon: float,
@@ -61,14 +63,42 @@ class SpeedMapDisplay(MapDisplay):
 
     def render(self) -> None:
         self.surf.fill((0, 0, 0))
+        self._tooltip_surf.fill((0, 0, 0, 0))
         self.draw_cities()
 
         if self._path is not None:
             self.draw_path(self._path)
+            mpos = Vec2(*pygame.mouse.get_pos())
+            self.tooltip_nearest(mpos)
+            self.surf.blit(self._tooltip_surf, (0, 0))
 
     def set_path(self, path: Path) -> None:
         self._path = path
 
+    def tooltip_nearest(self, mpos: Vec2) -> None:
+        closest = None
+        closest_i = 0
+        min_dist = 0
+
+        for i, pt in enumerate(self._path.points):
+            pt = Vec2(*self.real_to_screen(pt.x, pt.y))
+            dist = (pt - mpos).mag
+            if i == 0 or dist < min_dist:
+                closest = pt
+                closest_i = i
+                min_dist = dist
+
+        pt = closest
+        speed = self._path.extra_data[closest_i]
+        col = (200, 150, 50)
+        pygame.draw.circle(self.surf, col, (pt.x, pt.y), 2 * self.PATH_WIDTH, 2)
+        pygame.draw.line(self.surf, col, (pt.x, pt.y), (mpos.x, mpos.y), 2)
+        txt = self.font.render(f"{speed:.1f} km/h", True, (150, 200, 255))
+        txt_size = Vec2(*txt.get_size())
+        txt_pos = mpos - txt_size.scale(Vec2(0.5, 1))
+        pygame.draw.rect(self._tooltip_surf, (0, 0, 0, 150), (txt_pos.x, txt_pos.y, txt_size.x, txt_size.y))
+        self._tooltip_surf.blit(txt, (txt_pos.x, txt_pos.y))
+
 
 if __name__ == '__main__':
     name = "data_28-03"