a1843415aa
2D canvas DrawVertex to create a vector graphic background touch & keypad playable landscape & portrait for all known device sizes. All measurements in DP and nicely scaling. using xml drawables to rotate "dpad" arrow Change-Id: I995acaaf0935c13c03fcbcf974ce5af06f46780e
562 lines
17 KiB
Java
Executable File
562 lines
17 KiB
Java
Executable File
/*
|
|
* Copyright (C) 2007 The Android Open Source Project
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
package com.example.android.snake;
|
|
|
|
import android.content.Context;
|
|
import android.content.res.Resources;
|
|
import android.os.Bundle;
|
|
import android.os.Handler;
|
|
import android.os.Message;
|
|
import android.util.AttributeSet;
|
|
import android.util.Log;
|
|
import android.view.View;
|
|
import android.widget.TextView;
|
|
|
|
import java.util.ArrayList;
|
|
import java.util.Random;
|
|
|
|
/**
|
|
* SnakeView: implementation of a simple game of Snake
|
|
*/
|
|
public class SnakeView extends TileView {
|
|
|
|
private static final String TAG = "SnakeView";
|
|
|
|
/**
|
|
* Current mode of application: READY to run, RUNNING, or you have already lost. static final
|
|
* ints are used instead of an enum for performance reasons.
|
|
*/
|
|
private int mMode = READY;
|
|
public static final int PAUSE = 0;
|
|
public static final int READY = 1;
|
|
public static final int RUNNING = 2;
|
|
public static final int LOSE = 3;
|
|
|
|
/**
|
|
* Current direction the snake is headed.
|
|
*/
|
|
private int mDirection = NORTH;
|
|
private int mNextDirection = NORTH;
|
|
private static final int NORTH = 1;
|
|
private static final int SOUTH = 2;
|
|
private static final int EAST = 3;
|
|
private static final int WEST = 4;
|
|
|
|
/**
|
|
* Labels for the drawables that will be loaded into the TileView class
|
|
*/
|
|
private static final int RED_STAR = 1;
|
|
private static final int YELLOW_STAR = 2;
|
|
private static final int GREEN_STAR = 3;
|
|
|
|
/**
|
|
* mScore: Used to track the number of apples captured mMoveDelay: number of milliseconds
|
|
* between snake movements. This will decrease as apples are captured.
|
|
*/
|
|
private long mScore = 0;
|
|
private long mMoveDelay = 600;
|
|
/**
|
|
* mLastMove: Tracks the absolute time when the snake last moved, and is used to determine if a
|
|
* move should be made based on mMoveDelay.
|
|
*/
|
|
private long mLastMove;
|
|
|
|
/**
|
|
* mStatusText: Text shows to the user in some run states
|
|
*/
|
|
private TextView mStatusText;
|
|
|
|
/**
|
|
* mArrowsView: View which shows 4 arrows to signify 4 directions in which the snake can move
|
|
*/
|
|
private View mArrowsView;
|
|
|
|
/**
|
|
* mBackgroundView: Background View which shows 4 different colored triangles pressing which
|
|
* moves the snake
|
|
*/
|
|
private View mBackgroundView;
|
|
|
|
/**
|
|
* mSnakeTrail: A list of Coordinates that make up the snake's body mAppleList: The secret
|
|
* location of the juicy apples the snake craves.
|
|
*/
|
|
private ArrayList<Coordinate> mSnakeTrail = new ArrayList<Coordinate>();
|
|
private ArrayList<Coordinate> mAppleList = new ArrayList<Coordinate>();
|
|
|
|
/**
|
|
* Everyone needs a little randomness in their life
|
|
*/
|
|
private static final Random RNG = new Random();
|
|
|
|
/**
|
|
* Create a simple handler that we can use to cause animation to happen. We set ourselves as a
|
|
* target and we can use the sleep() function to cause an update/invalidate to occur at a later
|
|
* date.
|
|
*/
|
|
|
|
private RefreshHandler mRedrawHandler = new RefreshHandler();
|
|
|
|
class RefreshHandler extends Handler {
|
|
|
|
@Override
|
|
public void handleMessage(Message msg) {
|
|
SnakeView.this.update();
|
|
SnakeView.this.invalidate();
|
|
}
|
|
|
|
public void sleep(long delayMillis) {
|
|
this.removeMessages(0);
|
|
sendMessageDelayed(obtainMessage(0), delayMillis);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Constructs a SnakeView based on inflation from XML
|
|
*
|
|
* @param context
|
|
* @param attrs
|
|
*/
|
|
public SnakeView(Context context, AttributeSet attrs) {
|
|
super(context, attrs);
|
|
initSnakeView(context);
|
|
}
|
|
|
|
public SnakeView(Context context, AttributeSet attrs, int defStyle) {
|
|
super(context, attrs, defStyle);
|
|
initSnakeView(context);
|
|
}
|
|
|
|
private void initSnakeView(Context context) {
|
|
|
|
setFocusable(true);
|
|
|
|
Resources r = this.getContext().getResources();
|
|
|
|
resetTiles(4);
|
|
loadTile(RED_STAR, r.getDrawable(R.drawable.redstar));
|
|
loadTile(YELLOW_STAR, r.getDrawable(R.drawable.yellowstar));
|
|
loadTile(GREEN_STAR, r.getDrawable(R.drawable.greenstar));
|
|
|
|
}
|
|
|
|
private void initNewGame() {
|
|
mSnakeTrail.clear();
|
|
mAppleList.clear();
|
|
|
|
// For now we're just going to load up a short default eastbound snake
|
|
// that's just turned north
|
|
|
|
mSnakeTrail.add(new Coordinate(7, 7));
|
|
mSnakeTrail.add(new Coordinate(6, 7));
|
|
mSnakeTrail.add(new Coordinate(5, 7));
|
|
mSnakeTrail.add(new Coordinate(4, 7));
|
|
mSnakeTrail.add(new Coordinate(3, 7));
|
|
mSnakeTrail.add(new Coordinate(2, 7));
|
|
mNextDirection = NORTH;
|
|
|
|
// Two apples to start with
|
|
addRandomApple();
|
|
addRandomApple();
|
|
|
|
mMoveDelay = 600;
|
|
mScore = 0;
|
|
}
|
|
|
|
/**
|
|
* Given a ArrayList of coordinates, we need to flatten them into an array of ints before we can
|
|
* stuff them into a map for flattening and storage.
|
|
*
|
|
* @param cvec : a ArrayList of Coordinate objects
|
|
* @return : a simple array containing the x/y values of the coordinates as
|
|
* [x1,y1,x2,y2,x3,y3...]
|
|
*/
|
|
private int[] coordArrayListToArray(ArrayList<Coordinate> cvec) {
|
|
int[] rawArray = new int[cvec.size() * 2];
|
|
|
|
int i = 0;
|
|
for (Coordinate c : cvec) {
|
|
rawArray[i++] = c.x;
|
|
rawArray[i++] = c.y;
|
|
}
|
|
|
|
return rawArray;
|
|
}
|
|
|
|
/**
|
|
* Save game state so that the user does not lose anything if the game process is killed while
|
|
* we are in the background.
|
|
*
|
|
* @return a Bundle with this view's state
|
|
*/
|
|
public Bundle saveState() {
|
|
Bundle map = new Bundle();
|
|
|
|
map.putIntArray("mAppleList", coordArrayListToArray(mAppleList));
|
|
map.putInt("mDirection", Integer.valueOf(mDirection));
|
|
map.putInt("mNextDirection", Integer.valueOf(mNextDirection));
|
|
map.putLong("mMoveDelay", Long.valueOf(mMoveDelay));
|
|
map.putLong("mScore", Long.valueOf(mScore));
|
|
map.putIntArray("mSnakeTrail", coordArrayListToArray(mSnakeTrail));
|
|
|
|
return map;
|
|
}
|
|
|
|
/**
|
|
* Given a flattened array of ordinate pairs, we reconstitute them into a ArrayList of
|
|
* Coordinate objects
|
|
*
|
|
* @param rawArray : [x1,y1,x2,y2,...]
|
|
* @return a ArrayList of Coordinates
|
|
*/
|
|
private ArrayList<Coordinate> coordArrayToArrayList(int[] rawArray) {
|
|
ArrayList<Coordinate> coordArrayList = new ArrayList<Coordinate>();
|
|
|
|
int coordCount = rawArray.length;
|
|
for (int index = 0; index < coordCount; index += 2) {
|
|
Coordinate c = new Coordinate(rawArray[index], rawArray[index + 1]);
|
|
coordArrayList.add(c);
|
|
}
|
|
return coordArrayList;
|
|
}
|
|
|
|
/**
|
|
* Restore game state if our process is being relaunched
|
|
*
|
|
* @param icicle a Bundle containing the game state
|
|
*/
|
|
public void restoreState(Bundle icicle) {
|
|
setMode(PAUSE);
|
|
|
|
mAppleList = coordArrayToArrayList(icicle.getIntArray("mAppleList"));
|
|
mDirection = icicle.getInt("mDirection");
|
|
mNextDirection = icicle.getInt("mNextDirection");
|
|
mMoveDelay = icicle.getLong("mMoveDelay");
|
|
mScore = icicle.getLong("mScore");
|
|
mSnakeTrail = coordArrayToArrayList(icicle.getIntArray("mSnakeTrail"));
|
|
}
|
|
|
|
/**
|
|
* Handles snake movement triggers from Snake Activity and moves the snake accordingly. Ignore
|
|
* events that would cause the snake to immediately turn back on itself.
|
|
*
|
|
* @param direction The desired direction of movement
|
|
*/
|
|
public void moveSnake(int direction) {
|
|
|
|
if (direction == Snake.MOVE_UP) {
|
|
if (mMode == READY | mMode == LOSE) {
|
|
/*
|
|
* At the beginning of the game, or the end of a previous one,
|
|
* we should start a new game if UP key is clicked.
|
|
*/
|
|
initNewGame();
|
|
setMode(RUNNING);
|
|
update();
|
|
return;
|
|
}
|
|
|
|
if (mMode == PAUSE) {
|
|
/*
|
|
* If the game is merely paused, we should just continue where we left off.
|
|
*/
|
|
setMode(RUNNING);
|
|
update();
|
|
return;
|
|
}
|
|
|
|
if (mDirection != SOUTH) {
|
|
mNextDirection = NORTH;
|
|
}
|
|
return;
|
|
}
|
|
|
|
if (direction == Snake.MOVE_DOWN) {
|
|
if (mDirection != NORTH) {
|
|
mNextDirection = SOUTH;
|
|
}
|
|
return;
|
|
}
|
|
|
|
if (direction == Snake.MOVE_LEFT) {
|
|
if (mDirection != EAST) {
|
|
mNextDirection = WEST;
|
|
}
|
|
return;
|
|
}
|
|
|
|
if (direction == Snake.MOVE_RIGHT) {
|
|
if (mDirection != WEST) {
|
|
mNextDirection = EAST;
|
|
}
|
|
return;
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Sets the Dependent views that will be used to give information (such as "Game Over" to the
|
|
* user and also to handle touch events for making movements
|
|
*
|
|
* @param newView
|
|
*/
|
|
public void setDependentViews(TextView msgView, View arrowView, View backgroundView) {
|
|
mStatusText = msgView;
|
|
mArrowsView = arrowView;
|
|
mBackgroundView = backgroundView;
|
|
}
|
|
|
|
/**
|
|
* Updates the current mode of the application (RUNNING or PAUSED or the like) as well as sets
|
|
* the visibility of textview for notification
|
|
*
|
|
* @param newMode
|
|
*/
|
|
public void setMode(int newMode) {
|
|
int oldMode = mMode;
|
|
mMode = newMode;
|
|
|
|
if (newMode == RUNNING && oldMode != RUNNING) {
|
|
// hide the game instructions
|
|
mStatusText.setVisibility(View.INVISIBLE);
|
|
update();
|
|
// make the background and arrows visible as soon the snake starts moving
|
|
mArrowsView.setVisibility(View.VISIBLE);
|
|
mBackgroundView.setVisibility(View.VISIBLE);
|
|
return;
|
|
}
|
|
|
|
Resources res = getContext().getResources();
|
|
CharSequence str = "";
|
|
if (newMode == PAUSE) {
|
|
mArrowsView.setVisibility(View.GONE);
|
|
mBackgroundView.setVisibility(View.GONE);
|
|
str = res.getText(R.string.mode_pause);
|
|
}
|
|
if (newMode == READY) {
|
|
mArrowsView.setVisibility(View.GONE);
|
|
mBackgroundView.setVisibility(View.GONE);
|
|
|
|
str = res.getText(R.string.mode_ready);
|
|
}
|
|
if (newMode == LOSE) {
|
|
mArrowsView.setVisibility(View.GONE);
|
|
mBackgroundView.setVisibility(View.GONE);
|
|
str = res.getString(R.string.mode_lose, mScore);
|
|
}
|
|
|
|
mStatusText.setText(str);
|
|
mStatusText.setVisibility(View.VISIBLE);
|
|
}
|
|
|
|
/**
|
|
* @return the Game state as Running, Ready, Paused, Lose
|
|
*/
|
|
public int getGameState() {
|
|
return mMode;
|
|
}
|
|
|
|
/**
|
|
* Selects a random location within the garden that is not currently covered by the snake.
|
|
* Currently _could_ go into an infinite loop if the snake currently fills the garden, but we'll
|
|
* leave discovery of this prize to a truly excellent snake-player.
|
|
*/
|
|
private void addRandomApple() {
|
|
Coordinate newCoord = null;
|
|
boolean found = false;
|
|
while (!found) {
|
|
// Choose a new location for our apple
|
|
int newX = 1 + RNG.nextInt(mXTileCount - 2);
|
|
int newY = 1 + RNG.nextInt(mYTileCount - 2);
|
|
newCoord = new Coordinate(newX, newY);
|
|
|
|
// Make sure it's not already under the snake
|
|
boolean collision = false;
|
|
int snakelength = mSnakeTrail.size();
|
|
for (int index = 0; index < snakelength; index++) {
|
|
if (mSnakeTrail.get(index).equals(newCoord)) {
|
|
collision = true;
|
|
}
|
|
}
|
|
// if we're here and there's been no collision, then we have
|
|
// a good location for an apple. Otherwise, we'll circle back
|
|
// and try again
|
|
found = !collision;
|
|
}
|
|
if (newCoord == null) {
|
|
Log.e(TAG, "Somehow ended up with a null newCoord!");
|
|
}
|
|
mAppleList.add(newCoord);
|
|
}
|
|
|
|
/**
|
|
* Handles the basic update loop, checking to see if we are in the running state, determining if
|
|
* a move should be made, updating the snake's location.
|
|
*/
|
|
public void update() {
|
|
if (mMode == RUNNING) {
|
|
long now = System.currentTimeMillis();
|
|
|
|
if (now - mLastMove > mMoveDelay) {
|
|
clearTiles();
|
|
updateWalls();
|
|
updateSnake();
|
|
updateApples();
|
|
mLastMove = now;
|
|
}
|
|
mRedrawHandler.sleep(mMoveDelay);
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Draws some walls.
|
|
*/
|
|
private void updateWalls() {
|
|
for (int x = 0; x < mXTileCount; x++) {
|
|
setTile(GREEN_STAR, x, 0);
|
|
setTile(GREEN_STAR, x, mYTileCount - 1);
|
|
}
|
|
for (int y = 1; y < mYTileCount - 1; y++) {
|
|
setTile(GREEN_STAR, 0, y);
|
|
setTile(GREEN_STAR, mXTileCount - 1, y);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Draws some apples.
|
|
*/
|
|
private void updateApples() {
|
|
for (Coordinate c : mAppleList) {
|
|
setTile(YELLOW_STAR, c.x, c.y);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Figure out which way the snake is going, see if he's run into anything (the walls, himself,
|
|
* or an apple). If he's not going to die, we then add to the front and subtract from the rear
|
|
* in order to simulate motion. If we want to grow him, we don't subtract from the rear.
|
|
*/
|
|
private void updateSnake() {
|
|
boolean growSnake = false;
|
|
|
|
// Grab the snake by the head
|
|
Coordinate head = mSnakeTrail.get(0);
|
|
Coordinate newHead = new Coordinate(1, 1);
|
|
|
|
mDirection = mNextDirection;
|
|
|
|
switch (mDirection) {
|
|
case EAST: {
|
|
newHead = new Coordinate(head.x + 1, head.y);
|
|
break;
|
|
}
|
|
case WEST: {
|
|
newHead = new Coordinate(head.x - 1, head.y);
|
|
break;
|
|
}
|
|
case NORTH: {
|
|
newHead = new Coordinate(head.x, head.y - 1);
|
|
break;
|
|
}
|
|
case SOUTH: {
|
|
newHead = new Coordinate(head.x, head.y + 1);
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Collision detection
|
|
// For now we have a 1-square wall around the entire arena
|
|
if ((newHead.x < 1) || (newHead.y < 1) || (newHead.x > mXTileCount - 2)
|
|
|| (newHead.y > mYTileCount - 2)) {
|
|
setMode(LOSE);
|
|
return;
|
|
|
|
}
|
|
|
|
// Look for collisions with itself
|
|
int snakelength = mSnakeTrail.size();
|
|
for (int snakeindex = 0; snakeindex < snakelength; snakeindex++) {
|
|
Coordinate c = mSnakeTrail.get(snakeindex);
|
|
if (c.equals(newHead)) {
|
|
setMode(LOSE);
|
|
return;
|
|
}
|
|
}
|
|
|
|
// Look for apples
|
|
int applecount = mAppleList.size();
|
|
for (int appleindex = 0; appleindex < applecount; appleindex++) {
|
|
Coordinate c = mAppleList.get(appleindex);
|
|
if (c.equals(newHead)) {
|
|
mAppleList.remove(c);
|
|
addRandomApple();
|
|
|
|
mScore++;
|
|
mMoveDelay *= 0.9;
|
|
|
|
growSnake = true;
|
|
}
|
|
}
|
|
|
|
// push a new head onto the ArrayList and pull off the tail
|
|
mSnakeTrail.add(0, newHead);
|
|
// except if we want the snake to grow
|
|
if (!growSnake) {
|
|
mSnakeTrail.remove(mSnakeTrail.size() - 1);
|
|
}
|
|
|
|
int index = 0;
|
|
for (Coordinate c : mSnakeTrail) {
|
|
if (index == 0) {
|
|
setTile(YELLOW_STAR, c.x, c.y);
|
|
} else {
|
|
setTile(RED_STAR, c.x, c.y);
|
|
}
|
|
index++;
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Simple class containing two integer values and a comparison function. There's probably
|
|
* something I should use instead, but this was quick and easy to build.
|
|
*/
|
|
private class Coordinate {
|
|
public int x;
|
|
public int y;
|
|
|
|
public Coordinate(int newX, int newY) {
|
|
x = newX;
|
|
y = newY;
|
|
}
|
|
|
|
public boolean equals(Coordinate other) {
|
|
if (x == other.x && y == other.y) {
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
@Override
|
|
public String toString() {
|
|
return "Coordinate: [" + x + "," + y + "]";
|
|
}
|
|
}
|
|
|
|
}
|