MathVis: Mark the selected display item with an active color

When the number of items defined in MathVis grows, then finding
a specific item in the ViewPort becomes more difficult. One way
to "solve" this is by limiting the number of displayed items.

This patch adds another way by color marking the selected item
in the MathVis list widget with an 'active' color
I have implemented this for matrix bounding boxes and vectors.

Benefit: this way you can quickly step over the list and see
which item highlights in the viewport.

Example:
{F10357951}

Reviewed By: campbellbarton

Differential Revision: https://developer.blender.org/D12360

space_view3d_math_vis/draw.py

@@ -39,7 +39,9 @@ else:
 
 COLOR_POINT = (1.0, 0.0, 1.0, 1)
 COLOR_LINE = (0.5, 0.5, 1, 1)
+COLOR_LINE_ACTIVE = (1.0, 1.0, 0.5, 1)
 COLOR_BOUNDING_BOX = (1.0, 1.0, 1.0, 1.0)
+COLOR_BOUNDING_BOX_ACTIVE = (1.0, 0.5, 0.0, 1.0)
 
 
 def tag_redraw_areas():
@@ -136,6 +138,8 @@ def draw_callback_px():
 
 def draw_callback_view():
     settings = bpy.context.window_manager.MathVisProp
+    prop_states = bpy.context.window_manager.MathVisStatePropList
+
     scale = settings.bbox_scale
     with_bounding_box = not settings.bbox_hide
 
@@ -145,31 +149,36 @@ def draw_callback_view():
         bgl.glDepthFunc(bgl.GL_LESS)
 
     data_matrix, data_quat, data_euler, data_vector, data_vector_array = utils.console_math_data()
+    active_index = settings.index
+    active_key = prop_states[active_index].name if active_index >= 0 else None
 
     if data_vector:
         coords = [tuple(vec.to_3d()) for vec in data_vector.values()]
         draw_points(coords)
 
     if data_vector_array:
-        for line in data_vector_array.values():
+        for key, line in data_vector_array.items():
             coords = [tuple(vec.to_3d()) for vec in line]
-            draw_line(coords)
+            if key == active_key:
+                draw_line(coords,  COLOR_LINE_ACTIVE)
+            else:
+                draw_line(coords,  COLOR_LINE)
 
     if data_matrix:
-        draw_matrices(list(data_matrix.values()), scale, with_bounding_box)
+        draw_matrices(data_matrix, scale, with_bounding_box, active_key)
 
     if data_euler or data_quat:
         cursor = bpy.context.scene.cursor.location.copy()
         derived_matrices = []
-        for quat in data_quat.values():
+        for key, quat in data_quat.values():
             matrix = quat.to_matrix().to_4x4()
             matrix.translation = cursor
-            derived_matrices.append(matrix)
-        for eul in data_euler.values():
+            derived_matrices[key] = matrix
+        for key, eul in data_euler.values():
             matrix = eul.to_matrix().to_4x4()
             matrix.translation = cursor
-            derived_matrices.append(matrix)
-        draw_matrices(derived_matrices, scale, with_bounding_box)
+            derived_matrices[key] = matrix
+        draw_matrices(derived_matrices, scale, with_bounding_box, active_key)
 
 
 def draw_points(points):
@@ -179,10 +188,10 @@ def draw_points(points):
     batch.draw(single_color_shader)
 
 
-def draw_line(points):
+def draw_line(points, color):
     batch = batch_from_points(points, "LINE_STRIP")
     single_color_shader.bind()
-    single_color_shader.uniform_float("color", COLOR_LINE)
+    single_color_shader.uniform_float("color", color)
     batch.draw(single_color_shader)
 
 
@@ -190,7 +199,7 @@ def batch_from_points(points, type):
     return batch_for_shader(single_color_shader, type, {"pos": points})
 
 
-def draw_matrices(matrices, scale, with_bounding_box):
+def draw_matrices(matrices, scale, with_bounding_box, active_key):
     x_p = Vector((scale, 0.0, 0.0))
     x_n = Vector((-scale, 0.0, 0.0))
     y_p = Vector((0.0, scale, 0.0))
@@ -207,7 +216,9 @@ def draw_matrices(matrices, scale, with_bounding_box):
 
     coords = []
     colors = []
-    for matrix in matrices:
+    selected = []
+    active = []
+    for key, matrix in matrices.items():
         coords.append(matrix @ x_n)
         coords.append(matrix @ x_p)
         colors.extend((red_dark, red_light))
@@ -217,6 +228,10 @@ def draw_matrices(matrices, scale, with_bounding_box):
         coords.append(matrix @ z_n)
         coords.append(matrix @ z_p)
         colors.extend((blue_dark, blue_light))
+        if key == active_key:
+            active.append(matrix)
+        else:
+            selected.append(matrix)
 
     batch = batch_for_shader(smooth_color_shader, "LINES", {
         "pos": coords,
@@ -225,7 +240,10 @@ def draw_matrices(matrices, scale, with_bounding_box):
     batch.draw(smooth_color_shader)
 
     if with_bounding_box:
-        draw_bounding_boxes(matrices, scale, COLOR_BOUNDING_BOX)
+        if selected:
+            draw_bounding_boxes(selected, scale, COLOR_BOUNDING_BOX)
+        if active:
+            draw_bounding_boxes(active, scale, COLOR_BOUNDING_BOX_ACTIVE)
 
 
 def draw_bounding_boxes(matrices, scale, color):