From 7e4cd1bac23f7cc02d0f14bcc6ef00357377fc2a Mon Sep 17 00:00:00 2001
From: Yuchen Pei <me@ypei.me>
Date: Mon, 8 Jan 2018 12:35:44 +0100
Subject: checkpoint finished first draft of Board.jack

---
 projects/09/K/Board.jack | 237 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 237 insertions(+)
 create mode 100644 projects/09/K/Board.jack

(limited to 'projects/09/K/Board.jack')

diff --git a/projects/09/K/Board.jack b/projects/09/K/Board.jack
new file mode 100644
index 0000000..9e3678e
--- /dev/null
+++ b/projects/09/K/Board.jack
@@ -0,0 +1,237 @@
+class Board {
+    field Array grid;
+    field int nTurn;
+
+    constructor Board new() {
+        let grid = Array.new(4);
+        var int i, j;
+        let i = 0;
+        while (i < 4) {
+            let j = 0;
+            let grid[i] = Array.new(4);
+            while (j < 4) {
+                let grid[i][j] = 32;
+            }
+            let i = i + 1;
+        }
+        let grid[0][0] = 65;
+        let nTurn = 0;
+        return this;
+    }
+
+    method void arrange(Array xs, boolean isHorizontal) {
+        if (isHorizontal) {
+            let grid = copy(xs)
+        } else {
+            let grid = transpose(xs)
+        }
+    }
+
+
+    method Array copy(Array xs) {
+        var Array ys;
+        let ys = Array.new(4);
+        var int i;
+        let i = 0;
+        while (i < 4) {
+            let ys[i] = xs[i];
+            let i = i + 1;
+        }
+        return ys;
+    }
+
+    method Array deepcopy(Array xs) {
+        var Array ys;
+        let ys = Array.new(4);
+        var int i;
+        let i = 0;
+        while (i < 4) {
+            let ys[i] = copy(xs[i]);
+            let i = i + 1;
+        }
+        return ys;
+    }
+
+    mothod Array transpose(Array xs){
+        var Array ys;
+        var int i, j;
+        let i = 0;
+        let ys = Array.new(4);
+        while (i < 4) {
+            let ys[i] = Array.new(4)
+            let j = 0;
+            while (j < 4) {
+                let ys[i][j] = xs[j][i];
+                let j = j + 1;
+            }
+            let i = i + 1;
+        }
+        return ys;
+    }
+
+    method Array getStrip(boolean isHorizontal){
+        var Array xs;
+        if (isHorizontal) {
+            let xs = deepcopy(grid);
+        } else {
+            let xs = transpose(grid);
+        }
+        return xs;
+    }
+
+    method Array align(Array xs, boolean left){
+        var int i, j;
+        let i = 0;
+        let j = 0;
+        if (left = true) {
+            while (i < 4) {
+                if (xs[i] > 96) {
+                    let xs[j] = xs[i];
+                    let j = j + 1;
+                }
+                let i = i + 1;
+            }
+            while (j < 4) {
+                let xs[j] = 32;
+                let j = j + 1;
+            }
+        } else {
+            while (i < 4) {
+                if (xs[3 - i] > 96) {
+                    let xs[3 - j] = xs[3 - i];
+                    let j = j + 1;
+                }
+                let i = i + 1;
+            }
+            while (j < 4) {
+                let xs[3 - j] = 32;
+                let j = j + 1;
+            }
+        }
+        return xs;
+    }
+
+    method Array reduce(Array xs, boolean left){
+        if ((xs[0] = xs[1]) & (xs[2] = xs[3])) {
+            if (left = true) {
+                let xs[0] = xs[0] + 1;
+                let xs[1] = xs[2] + 1; 
+                let xs[2] = 32;
+                let xs[3] = 32;
+            } else {
+                let xs[3] = xs[3] + 1;
+                let xs[2] = xs[1] + 1;
+                let xs[1] = 32;
+                let xs[0] = 32;
+            }
+            return xs;
+        }
+        if (xs[0] = xs[1]) {
+            if (left = true) {
+                let xs[0] = xs[0] + 1;
+                let xs[1] = xs[2];
+                let xs[2] = xs[3];
+                let xs[3] = 32;
+            } else {
+                let xs[1] = xs[1] + 1;
+                let xs[0] = 32;
+            }
+            return xs;
+        }
+        if (xs[2] = xs[3]) {
+            if (left = true) {
+                let xs[2] = xs[2] + 1;
+                let xs[3] = 32;
+            } else {
+                let xs[3] = xs[3] + 1;
+                let xs[2] = xs[1];
+                let xs[1] = xs[0];
+                let xs[0] = 32;
+            }
+            return xs;
+        }
+        if (xs[1] = xs[2]) {
+            if (left = true) {
+                let xs[1] = xs[1] + 1;
+                let xs[2] = xs[3];
+                let xs[3] = 32;
+            } else {
+                let xs[2] = xs[2] + 1;
+                let xs[1] = xs[0]
+                let xs[0] = 32;
+            }
+            return xs;
+        }
+        return xs;
+    }
+
+    method void addTile(){
+        var int x, y;
+        var char z;
+        let x = nTurn;
+        let y = 23 * x * x + 79;
+        let x = y - (y / 16 * 16);
+        let r = x / 4;
+        let c = x - (r * 4);
+        let z = 97;
+        while (grid[r][c] > 96) {
+            let y = 23 * x * x + 79;
+            let x = y - (y / 16 * 16);
+            let r = x / 4;
+            let c = x - (r * 4);
+            let z = 195 - z;
+        }
+        let grid[r][c] = z;
+        return;
+    }
+
+    method void transform(char dir){
+        var boolean isHorizontal, left;
+        if ((dir = 0) or (dir = 1)) {
+            let left = true;
+        } else {
+            let left = false;
+        }
+        if ((dir = 0) or (dir = 2)) {
+            let isHorizontal = true;
+        } else {
+            let isHorizontal = false;
+        }
+        var Array xs;
+        let xs = getStrip(isHorizontal);
+        var int i;
+        let i = 0;
+        while (i < 4) {
+            xs[i] = reduce(align(xs[i], left), left);
+        }
+        do arrange(xs, isHorizontal);
+        return;
+    }
+
+    method void next(char dir){
+        do addTile();
+        let nTurn = nTurn + 1;
+        do transform(dir);
+        return;
+    }
+
+    method void draw(){
+        var int r, c, i, j;
+        let r = 9;
+        let c = 30;
+        let i = 0;
+        while (i < 4) {
+            let j = 0;
+            do Output.moveCursor(r + i, c);
+            while (j < 4) {
+                do Output.printChar(grid[i][j]);
+                let j = j + 1;
+            }
+            let i = i + 1;
+        }
+    }
+
+    method void dispose() {
+        do Memory.deAlloc(this);
+    }
+}
-- 
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