Added OnDiagonal Modifier [Modifier 2 of 4]

src/proceduralItem/modifiers/restrictions/_list.zig

@@ -3,3 +3,4 @@ pub const @"and" = @import("and.zig");
 pub const encased = @import("encased.zig");
 pub const not = @import("not.zig");
 pub const @"or" = @import("or.zig");
+pub const on_diagonal = @import("on_diagonal.zig");

src/proceduralItem/modifiers/restrictions/on_diagonal.zig

@@ -0,0 +1,52 @@
+const std = @import("std");
+
+const main = @import("main");
+const NeverFailingAllocator = main.heap.NeverFailingAllocator;
+const ModifierRestriction = main.items.ModifierRestriction;
+const ProceduralItem = main.items.ProceduralItem;
+const ZonElement = main.ZonElement;
+
+const On_diagonal = struct {
+	tag: main.Tag,
+	amount: usize,
+	range: ?usize,
+};
+
+pub fn satisfied(self: *const On_diagonal, proceduralItem: *const ProceduralItem, x: i32, y: i32) bool {
+	var count: usize = 0;
+	const gridSize: usize = proceduralItem.craftingGrid.len;
+	const rangeChecked = @min(self.range orelse 5, gridSize);
+	const lowBound = 0;
+	const highBound = rangeChecked*2 + 1;
+	for (lowBound..highBound) |dx| {
+		const checkedX = x + @as(i32, @intCast(dx - rangeChecked));
+		const checkedY = y + @as(i32, @intCast(dx - rangeChecked));
+		if ((proceduralItem.getItemAt(checkedX, checkedY) orelse continue).hasTag(self.tag)) count += 1;
+	}
+	for (lowBound..highBound) |dx| {
+		const checkedX = x + @as(i32, @intCast(dx - rangeChecked));
+		const checkedY = y - @as(i32, (@intCast(dx - rangeChecked)));
+		if (dx != 0) {
+			if ((proceduralItem.getItemAt(checkedX, checkedY) orelse continue).hasTag(self.tag)) count += 1;
+		}
+	}
+	return count >= self.amount;
+}
+
+pub fn loadFromZon(allocator: NeverFailingAllocator, zon: ZonElement) *const On_diagonal {
+	const result = allocator.create(On_diagonal);
+	result.* = .{
+		.tag = main.Tag.find(zon.get([]const u8, "tag", "not specified")),
+		.amount = zon.get(usize, "amount", 8),
+		.range = zon.get(?usize, "range", null),
+	};
+	return result;
+}
+
+pub fn printTooltip(self: *const On_diagonal, outString: *main.List(u8)) void {
+	if (self.range == null) {
+		outString.print("{} .{s} {s}", .{self.amount, self.tag.getName(), "on diagonal axis"});
+	} else {
+		outString.print("{} .{s} {s} {?}", .{self.amount, self.tag.getName(), "in diagonal range", self.range});
+	}
+}