ref(event): split Size into two Points (one for the size and one for the anchor / origin)

src/render.zig

@@ -2,14 +2,13 @@ const std = @import("std");
 const terminal = @import("terminal.zig");
 
 const Cell = @import("cell.zig");
-const Position = @import("size.zig").Position;
-const Size = @import("size.zig").Size;
+const Point = @import("point.zig").Point;
 
 /// Double-buffered intermediate rendering pipeline
 pub const Buffered = struct {
     allocator: std.mem.Allocator,
     created: bool,
-    size: Size,
+    size: Point,
     screen: []Cell,
     virtual_screen: []Cell,
 
@@ -30,9 +29,9 @@ pub const Buffered = struct {
         }
     }
 
-    pub fn resize(this: *@This(), size: Size) !void {
+    pub fn resize(this: *@This(), size: Point) !void {
         this.size = size;
-        const n = @as(usize, size.cols) * @as(usize, size.rows);
+        const n = @as(usize, size.x) * @as(usize, size.y);
 
         if (!this.created) {
             this.screen = this.allocator.alloc(Cell, n) catch @panic("render.zig: Out of memory.");
@@ -60,18 +59,19 @@ pub const Buffered = struct {
 
     /// Render provided cells at size (anchor and dimension) into the *virtual screen*.
     pub fn render(this: *@This(), comptime T: type, container: *T) !void {
-        const size: Size = container.size;
+        const size: Point = container.size;
+        const origin: Point = container.origin;
         const cells: []const Cell = try container.contents();
 
         if (cells.len == 0) return;
 
         var idx: usize = 0;
         var vs = this.virtual_screen;
-        const anchor: usize = (@as(usize, size.anchor.row) * @as(usize, this.size.cols)) + @as(usize, size.anchor.col);
+        const anchor: usize = (@as(usize, origin.y) * @as(usize, this.size.x)) + @as(usize, origin.x);
 
-        blk: for (0..size.rows) |row| {
-            for (0..size.cols) |col| {
-                vs[anchor + (row * this.size.cols) + col] = cells[idx];
+        blk: for (0..size.y) |row| {
+            for (0..size.x) |col| {
+                vs[anchor + (row * this.size.x) + col] = cells[idx];
                 idx += 1;
 
                 if (cells.len == idx) break :blk;
@@ -89,15 +89,15 @@ pub const Buffered = struct {
         const writer = terminal.writer();
         const s = this.screen;
         const vs = this.virtual_screen;
-        for (0..this.size.rows) |row| {
-            for (0..this.size.cols) |col| {
-                const idx = (row * this.size.cols) + col;
+        for (0..this.size.y) |row| {
+            for (0..this.size.x) |col| {
+                const idx = (row * this.size.x) + col;
                 const cs = s[idx];
                 const cvs = vs[idx];
                 if (cs.eql(cvs)) continue;
 
                 // render differences found in virtual screen
-                try terminal.setCursorPosition(.{ .row = @truncate(row + 1), .col = @truncate(col + 1) });
+                try terminal.setCursorPosition(.{ .y = @truncate(row + 1), .x = @truncate(col + 1) });
                 try cvs.value(writer);
                 // update screen to be the virtual screen for the next frame
                 s[idx] = vs[idx];