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Combinations.

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This commit is contained in:
Jacob Signorovitch
2025-04-10 08:27:30 -04:00
parent e9f15ebd03
commit c367b201d4
1 changed files with 29 additions and 12 deletions
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37
twentyfortyeight/src/twentyfortyeight/Main.java
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@@ -150,10 +150,10 @@ class Grid {
// Given an index and a direction, is there a free there?
boolean freeDir(int i, int d) {
if (d == 0) { // Left.
if ((i - 1) % this.w < 0) return false; // At an edge.
if (i % this.w == 0) return false; // At an edge.
return this.buf.get(i - 1) == 0;
} else if (d == 1) { // Down.
if ((i + this.w) > this.sz) return false; // At an edge
if ((i + 1 + this.w) > this.sz) return false; // At an edge
return this.buf.get(i + this.w) == 0;
} else if (d == 2) { // Up.
if ((i - this.w) < 0) return false;
@@ -168,6 +168,24 @@ class Grid {
throw new IllegalArgumentException("Bad direction code given.");
}
// Combine numbers that are the same into their sum. Start checking for
// combinations from the side the direction is to for each row/column.
void combine(int d) {
// Assume left.
if (d == 0) {
for (int i = 0; i < this.h; i++) {
int prv = this.get(0, i);
for (int j = 1; j < this.w; j++) {
int cur = this.get(j, i);
if (cur == prv) {
this.set(j - 1, i, cur * 2);
this.set(j, i, 0);
}
}
}
}
}
// Get the indexes of all moveable tiles in a given direction -- those
// that are abutted by a free cell in the specified direction.
List<Integer> mvblDir(int d) {
@@ -181,6 +199,7 @@ class Grid {
// Move the tile at the index 1 space in the specified direction.
void mvTile(int i, int d) {
System.out.println("attempting to move");
if (d == 0) this.buf.set(i - 1, this.buf.get(i));
else if (d == 1) this.buf.set(i + this.w, this.buf.get(i));
else if (d == 2) this.buf.set(i - this.w, this.buf.get(i));
@@ -206,24 +225,22 @@ class Grid {
// more.
void mv(int d) {
while (this.partMv(d)); // I love side effects :).
this.combine(d);
}
// Render the grid.
WorldScene render() {
WorldScene bg =
new WorldScene(Game.SCALE * this.w, Game.SCALE * this.h);
for (int i = 0; i < this.h; i++) {
for (int i = 0; i < this.h; i++)
for (int j = 0; j < this.w; j++) {
int n = this.get(i, j);
int coordx = i * Game.SCALE + Game.SCALE / 2;
int coordy = j * Game.SCALE + Game.SCALE / 2;
if (n == 0) {
bg.placeImageXY(ImgUtil.mkfree(), coordx, coordy);
} else {
bg.placeImageXY(ImgUtil.mktile(n), coordx, coordy);
}
}
if (n == 0) bg.placeImageXY(ImgUtil.mkfree(), coordx, coordy);
else bg.placeImageXY(ImgUtil.mktile(n), coordx, coordy);
}
return bg;
}
}
@@ -277,7 +294,7 @@ class Examples {
void testGame(Tester t) {
game = new Game();
game.grid.set(0, 0, 2);
game.grid.set(0, 0, 2).set(2, 0, 2);
game.launchGame();
}