From 07fb4ce51650e9b0edaf1b9ebc01c1b9589c9a54 Mon Sep 17 00:00:00 2001
From: Théo de la Hogue
Date: Tue, 17 Oct 2023 18:40:18 +0200
Subject: Implementing LinearRegression drawing function.

---
 src/argaze/GazeAnalysis/LinearRegression.py | 24 ++++++++++++++++++------
 1 file changed, 18 insertions(+), 6 deletions(-)

diff --git a/src/argaze/GazeAnalysis/LinearRegression.py b/src/argaze/GazeAnalysis/LinearRegression.py
index de7725d..0e10b87 100644
--- a/src/argaze/GazeAnalysis/LinearRegression.py
+++ b/src/argaze/GazeAnalysis/LinearRegression.py
@@ -79,14 +79,26 @@ class GazePositionCalibrator(GazeFeatures.GazePositionCalibrator):
 
             return gaze_position
 
-    def draw(self, image: numpy.array):
-        """Draw calibration into image.
+    def draw(self, image: numpy.array, size: tuple, resolution: tuple, line_color: tuple = (0, 0, 0), thickness: int = 1):
+        """Draw calibration field."""
+
+        width, height = size
         
-        Parameters:
-            image: where to draw
-        """
+        if width * height > 0:
+
+            rx, ry = resolution
+            lx = numpy.linspace(0, width, rx)
+            ly = numpy.linspace(0, height, ry)
+            xv, yv = numpy.meshgrid(lx, ly, indexing='ij')
+
+            for i in range(rx):
+
+                for j in range(ry):
+
+                    start = (xv[i][j], yv[i][j])
+                    end = self.apply(GazeFeatures.GazePosition(start)).value
 
-        raise NotImplementedError('draw() method not implemented')
+                    cv2.line(image, (int(start[0]), int(start[1])), (int(end[0]), int(end[1])), line_color, thickness)
 
     @property
     def calibrating(self) -> bool:
-- 
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