fix graph and white background added

python_app/gui/controllers/renderers/common.py

@@ -1,15 +1,25 @@
-"""Plot construction and color tables shared by radar views."""
+"""Plot construction, colors and color tables shared by radar views."""
 
 import numpy as np
 import pyqtgraph as pg
+from PyQt6.QtCore import QRectF
 
+from python_app.gui.theme import PLOT_FOREGROUND
 from python_app.models.run_config_schema import GprModel
 from python_app.models.run_config_validation import parse_position_csv
-from python_app.gui.theme import PLOT_BACKGROUND
+
+# Series identity colors in fixed order, checked for the white plot surface: lightness band,
+# chroma floor and neighbour separation under normal and colorblind vision. Aqua, yellow and
+# pink stay under 3:1 contrast with white, so lines are 2 px wide and the legend names pairs.
+SERIES_COLORS = ("#2a78d6", "#eb6834", "#1baf7a", "#eda100", "#e87ba4", "#008300", "#6250d6", "#e34948")
+# A captured trace shown on its own (main view, capture preview, PNG export).
+CAPTURED_TRACE_PEN = pg.mkPen(SERIES_COLORS[0], width=2)
+# Behind legends and labels, so their text stays legible over curves and heatmaps.
+OVERLAY_FILL = (255, 255, 255, 200)
 
 
 def create_plot(title: str = "") -> pg.PlotWidget:
-    plot = pg.PlotWidget(background=PLOT_BACKGROUND, enableMenu=False, title=title)
+    plot = pg.PlotWidget(enableMenu=False, title=title)
     plot.showGrid(x=True, y=True, alpha=0.2)
     return plot
 
@@ -26,8 +36,20 @@ def build_lut(stops: list[str], *, size: int = 256) -> np.ndarray:
     return lut
 
 
-# Same Tx/Rx markers on ground BP and the three planar SAR views.
-ANTENNA_STYLES = (("t", "#ff595e", "#ffca3a"), ("t1", "#4cc9f0", "#e0fbfc"))
+def image_rect(x_axis: np.ndarray, y_axis: np.ndarray) -> QRectF:
+    """Rectangle covering image pixels centred on the axis samples; a lone sample spans one unit."""
+    (x, width), (y, height) = (_pixel_span(axis) for axis in (x_axis, y_axis))
+    return QRectF(x, y, width, height)
+
+
+def _pixel_span(axis: np.ndarray) -> tuple[float, float]:
+    first, last = float(axis[0]), float(axis[-1])
+    pitch = (last - first) / (len(axis) - 1) if len(axis) > 1 else 1.0
+    return first - pitch / 2, last - first + pitch
+
+
+# Same Tx/Rx markers (symbol, fill, outline) on ground BP and the three planar SAR views.
+ANTENNA_STYLES = (("t", SERIES_COLORS[7], PLOT_FOREGROUND), ("t1", SERIES_COLORS[0], PLOT_FOREGROUND))
 
 
 def selected_antenna_coordinates(geometry: GprModel, inputs: str, outputs: str) -> tuple[np.ndarray, np.ndarray]: