Always auto calculate divisions per grid

If someone wants to make custom sized grid bins, they can pass in custom grid_dimensions.

gridfinity-rebuilt-bins.scad

@@ -78,12 +78,6 @@ style_lip = 0; //[0: Regular lip, 1:remove lip subtractively, 2: remove lip and
 // scoop weight percentage. 0 disables scoop, 1 is regular scoop. Any real number will scale the scoop.
 scoop = 1; //[0:0.1:1]
 
-/* [Base] */
-// number of divisions per 1 unit of base along the X axis. (default 1, only use integers. 0 means automatically guess the right division)
-div_base_x = 0;
-// number of divisions per 1 unit of base along the Y axis. (default 1, only use integers. 0 means automatically guess the right division)
-div_base_y = 0;
-
 /* [Base Hole Options] */
 // only cut magnet/screw holes at the corners of the bin to save uneccesary print time
 only_corners = false;
@@ -118,7 +112,7 @@ gridfinityInit(gridx, gridy, height(gridz, gridz_define, style_lip, enable_zsnap
         cutCylinders(n_divx=cdivx, n_divy=cdivy, cylinder_diameter=cd, cylinder_height=ch, coutout_depth=c_depth, orientation=c_orientation, chamfer=c_chamfer);
     }
 }
-gridfinityBase(gridx, gridy, l_grid, div_base_x, div_base_y, hole_options, only_corners=only_corners, thumbscrew=enable_thumbscrew);
+gridfinityBase([gridx, gridy], hole_options=hole_options, only_corners=only_corners, thumbscrew=enable_thumbscrew);
 }
 
 
@@ -129,7 +123,7 @@ gridfinityBase(gridx, gridy, l_grid, div_base_x, div_base_y, hole_options, only_
 gridfinityInit(3, 3, height(6), 0, 42) {
 	cutEqual(n_divx = 3, n_divy = 3, style_tab = 0, scoop_weight = 0);
 }
-gridfinityBase(3, 3, 42, 0, 0, 1);
+gridfinityBase([3, 3]);
 */
 
 // Compartments can be placed anywhere (this includes non-integer positions like 1/2 or 1/3). The grid is defined as (0,0) being the bottom left corner of the bin, with each unit being 1 base long. Each cut() module is a compartment, with the first four values defining the area that should be made into a compartment (X coord, Y coord, width, and height). These values should all be positive. t is the tab style of the compartment (0:full, 1:auto, 2:left, 3:center, 4:right, 5:none). s is a toggle for the bottom scoop.
@@ -146,7 +140,7 @@ gridfinityInit(3, 3, height(6), 0, 42) {
     cut(1.5, 0, 1.5, 5/3, 2);
     cut(1.5, 5/3, 1.5, 4/3, 4);
 }
-gridfinityBase(3, 3, 42, 0, 0, 1);
+gridfinityBase([3, 3]);
 */
 
 // Compartments can overlap! This allows for weirdly shaped compartments, such as this "2" bin.
@@ -170,7 +164,7 @@ gridfinityInit(3, 3, height(6), 0, 42) {
         pattern_linear(x=1, y=3, sx=42/2)
             cylinder(r=5, h=1000, center=true);
 }
-gridfinityBase(3, 3, 42, 0, 0, 1);
+gridfinityBase([3, 3]);
 */
 
 // You can use loops as well as the bin dimensions to make different parametric functions, such as this one, which divides the box into columns, with a small 1x1 top compartment and a long vertical compartment below
@@ -183,7 +177,7 @@ gridfinityInit(gx, gy, height(6), 0, 42) {
         cut(i,gx-1,1,1);
     }
 }
-gridfinityBase(gx, gy, 42, 0, 0, 1);
+gridfinityBase([gx, gy]);
 */
 
 // Pyramid scheme bin
@@ -195,5 +189,5 @@ gridfinityInit(gx, gy, height(6), 0, 42) {
     for (j = [0:i])
     cut(j*gx/(i+1),gy-i-1,gx/(i+1),1,0);
 }
-gridfinityBase(gx, gy, 42, 0, 0, 1);
+gridfinityBase([gx, gy]);
 */

gridfinity-rebuilt-lite.scad

@@ -16,9 +16,9 @@ $fs = 0.25;
 
 /* [General Settings] */
 // number of bases along x-axis
-gridx = 3;
+gridx = 3; //.5
 // number of bases along y-axis
-gridy = 3;
+gridy = 3; //.5
 // bin height. See bin height information and "gridz_define" below.
 gridz = 6;
 
@@ -41,10 +41,6 @@ gridz_define = 0; // [0:gridz is the height of bins in units of 7mm increments -
 style_tab = 1; //[0:Full,1:Auto,2:Left,3:Center,4:Right,5:None]
 
 /* [Base] */
-// number of divisions per 1 unit of base along the X axis. (default 1, only use integers. 0 means automatically guess the right division)
-div_base_x = 0;
-// number of divisions per 1 unit of base along the Y axis. (default 1, only use integers. 0 means automatically guess the right division)
-div_base_y = 0;
 // thickness of bottom layer
 bottom_layer = 1;
 
@@ -70,27 +66,27 @@ hole_options = bundle_hole_options(refined_holes, magnet_holes, screw_holes, cru
 
 // Input all the cutter types in here
 color("tomato")
-gridfinityLite(gridx, gridy, gridz, gridz_define, style_lip, enable_zsnap, l_grid, div_base_x, div_base_y, hole_options, only_corners) {
+gridfinityLite(gridx, gridy, gridz, gridz_define, style_lip, enable_zsnap, l_grid, hole_options, only_corners) {
     cutEqual(n_divx = divx, n_divy = divy, style_tab = style_tab, scoop_weight = 0);
 }
 
 // ===== CONSTRUCTION ===== //
 
-module gridfinityLite(gridx, gridy, gridz, gridz_define, style_lip, enable_zsnap, length, div_base_x, div_base_y, style_hole, only_corners) {
+module gridfinityLite(gridx, gridy, gridz, gridz_define, style_lip, enable_zsnap, length, style_hole, only_corners) {
     height_mm = height(gridz, gridz_define, style_lip, enable_zsnap);
     union() {
         difference() {
             union() {
                 gridfinityInit(gridx, gridy, height_mm, 0, length, sl=style_lip)
                 children();
-                gridfinityBase(gridx, gridy, length, div_base_x, div_base_y, style_hole, only_corners=only_corners);
+                gridfinityBase([gridx, gridy], [length, length], hole_options=style_hole, only_corners=only_corners);
             }
 
             difference() {
                 union() {
                     intersection() {
                         difference() {
-                            gridfinityBase(gridx, gridy, length, div_base_x, div_base_y, style_hole, -d_wall*2, false, only_corners=only_corners);
+                            gridfinityBase([gridx, gridy], [length, length], hole_options=style_hole, -d_wall*2, false, only_corners=only_corners);
                             translate([-gridx*length/2,-gridy*length/2,2*h_base])
                             cube([gridx*length,gridy*length,1000]);
                         }
@@ -123,7 +119,7 @@ module gridfinityLite(gridx, gridy, gridz, gridz_define, style_lip, enable_zsnap
 
                                 intersection() {
                                     difference() {
-                                        gridfinityBase(gridx, gridy, length, div_base_x, div_base_y, style_hole, -d_wall*2, false, only_corners=only_corners);
+                                        gridfinityBase([gridx, gridy], [length, length], hole_options=style_hole, -d_wall*2, false, only_corners=only_corners);
                                         translate([-gridx*length/2,-gridy*length/2,2*h_base])
                                         cube([gridx*length,gridy*length,1000]);
                                     }

gridfinity-rebuilt-utility.scad

@@ -201,41 +201,44 @@ module cut_move(x, y, w, h) {
 
 /**
  *@summary Create the base of a gridfinity bin, or use it for a custom object.
- * @param length X,Y size of a single Gridfinity base.
+ * @param grid_size Number of bases in each dimension. [x, y]
+ * @param grid_dimensions [length, width] of a single Gridfinity base.
  * @param thumbscrew Enable "gridfinity-refined" thumbscrew hole in the center of each base unit. This is a ISO Metric Profile, 15.0mm size, M15x1.5 designation.
  */
-module gridfinityBase(gx, gy, length, dx, dy, hole_options=bundle_hole_options(), off=0, final_cut=true, only_corners=false, thumbscrew=false) {
+module gridfinityBase(grid_size, grid_dimensions=[l_grid, l_grid], hole_options=bundle_hole_options(), off=0, final_cut=true, only_corners=false, thumbscrew=false) {
+    assert(is_list(grid_dimensions) && len(grid_dimensions) == 2 &&
+        grid_dimensions.x > 0 && grid_dimensions.y > 0);
+    assert(is_list(grid_size) && len(grid_size) == 2 &&
+        grid_size.x > 0 && grid_size.y > 0);
     assert(
-        is_num(gx) &&
-        is_num(gy) &&
-        is_num(length) &&
-        is_num(dx) &&
-        is_num(dy) &&
         is_bool(final_cut) &&
         is_bool(only_corners) &&
         is_bool(thumbscrew)
     );
 
-    dbnxt = [for (i=[1:5]) if (abs(gx*i)%1 < 0.001 || abs(gx*i)%1 > 0.999) i];
-    dbnyt = [for (i=[1:5]) if (abs(gy*i)%1 < 0.001 || abs(gy*i)%1 > 0.999) i];
-    dbnx = 1/(dx != 0 ? round(dx) : (len(dbnxt) > 0 ? dbnxt[0] : 1));
-    dbny = 1/(dy != 0 ? round(dy) : (len(dbnyt) > 0 ? dbnyt[0] : 1));
-
-    // Final size in number of bases
-    grid_size = [gx/dbnx, gy/dbny];
-
     // Per spec, there's a 0.5mm gap between each base.
     // This must be kept constant or half bins may not work correctly.
     gap_mm = l_grid - BASE_SIZE;
 
-    base_center_distance_mm = [dbnx, dbny] * length;  // Per spec this should be 42.
+    // Divisions per grid
+    // Normal, half, or quarter grid sizes supported.
+    // Automatically calculated using floating point comparisons.
+    dbnxt = [for (i=[1,2,4]) if (abs(grid_size.x*i)%1 < 0.001 || abs(grid_size.x*i)%1 > 0.999) i];
+    dbnyt = [for (i=[1,2,4]) if (abs(grid_size.y*i)%1 < 0.001 || abs(grid_size.y*i)%1 > 0.999) i];
+    assert(len(dbnxt) > 0 && len(dbnyt) > 0, "Base only supports half and quarter grid spacing.");
+    divisions_per_grid = [dbnxt[0], dbnyt[0]];
+
+    // Final size in number of bases
+    final_grid_size = [grid_size.x * divisions_per_grid.x, grid_size.y * divisions_per_grid.y];
+
+    base_center_distance_mm = [grid_dimensions.x / divisions_per_grid.x, grid_dimensions.y / divisions_per_grid.y];
     individual_base_size_mm = [base_center_distance_mm.x - gap_mm, base_center_distance_mm.y - gap_mm];
 
     // Final size of the base top. In mm.
     // subtracting gap_mm here to remove an outer lip along the peremiter.
     grid_size_mm = [
-        base_center_distance_mm.x * grid_size.x - gap_mm,
+        base_center_distance_mm.x * final_grid_size.x - gap_mm,
-        base_center_distance_mm.y * grid_size.y - gap_mm
+        base_center_distance_mm.y * final_grid_size.y - gap_mm
     ];
 
     // Top which ties all bases together
@@ -246,7 +249,7 @@ module gridfinityBase(gx, gy, length, dx, dy, hole_options=bundle_hole_options()
 
     if(only_corners) {
         difference(){
-            pattern_linear(grid_size.x, grid_size.y, base_center_distance_mm.x, base_center_distance_mm.y)
+            pattern_linear(final_grid_size.x, final_grid_size.y, base_center_distance_mm.x, base_center_distance_mm.y)
             block_base(bundle_hole_options(), 0, individual_base_size_mm, thumbscrew=thumbscrew);
 
             copy_mirror([0, 1, 0]) {
@@ -262,7 +265,7 @@ module gridfinityBase(gx, gy, length, dx, dy, hole_options=bundle_hole_options()
         }
     }
     else {
-        pattern_linear(grid_size.x, grid_size.y, base_center_distance_mm.x, base_center_distance_mm.y)
+        pattern_linear(final_grid_size.x, final_grid_size.y, base_center_distance_mm.x, base_center_distance_mm.y)
         block_base(hole_options, off, individual_base_size_mm, thumbscrew=thumbscrew);
     }
 }