add feature that you can drop disbalanced concentration at click point, to kickstart reaction there

scripts/run_simulation.jl

@@ -94,14 +94,41 @@ ax.aspect = DataAspect()
 
 spoint = select_point(ax.scene)
 
+function coord_to_index(x, y, N)
+    ix = clamp(round(Int, x), 1, N)
+    iy = clamp(round(Int, y), 1, N)
+    return ix, iy
+end
+r = 5
+
+on(spoint) do pt
+    if pt === nothing
+        return
+    end
+    x, y = pt
+    i, j = coord_to_index(x, y, N)
+
+    # get corners of square that will get filled with concentration
+    imin = max(i - r, 1)
+    imax = min(i + r, N)
+    jmin = max(j - r, 1)
+    jmax = min(j + r, N)
+
+    # set disbalanced concentration of U and V
+    U[imin:imax, jmin:jmax] .= 0.5
+    V[imin:imax, jmin:jmax] .= 0.25
+
+    heat_obs[] = copy(U)
+end
+
 # # Controls
 run_label = Observable("Run")
-fig[2, 1] = buttongrid = GridLayout(tellwidth=false)
+fig[2, 1] = buttongrid = GridLayout(ax.scene, tellwidth=false)
-btn_step = Button(buttongrid[1, 1], label="Step")
+btn_step = Button(buttongrid[1, 1], width=50, label="Step")
 btn_start = Button(buttongrid[1, 2], width=50, label=run_label)
-btn_reset = Button(buttongrid[1, 3], label="Reset")
+btn_reset = Button(buttongrid[1, 3], width=50, label="Reset")
 
-gh[1, 2] = textboxgrid = GridLayout(tellwidth=false)
+gh[1, 2] = textboxgrid = GridLayout(ax.scene, tellwidth=false)
 rowsize!(gh, 1, Relative(1.0))
 function param_box!(row, labeltxt, observable)
     Label(textboxgrid[row, 1], labeltxt)
@@ -148,7 +175,7 @@ end
 
 on(btn_start.clicks) do _
     @async while running[]
-        multi_step!((U, V), 30)
+        multi_step!((U, V), 60)
         sleep(0.05)  # ~20 FPS
     end
 end