Coding the boom method_Learning Java by Building Android Games-QQ阅读男生武侠网

书名：Learning Java by Building Android Games
作者名：John Horton
本章字数：277字
更新时间：2021-07-23 19:02:29

Coding the boom method

Add the new highlighted code inside the boom method and then we will go through what just happened.

// This code says "BOOM!"
void boom(){

   gameView.setImageBitmap(blankBitmap);

 // Wipe the screen with a red color
 canvas.drawColor(Color.argb(255, 255, 0, 0));

 // Draw some huge white text
 paint.setColor(Color.argb(255, 255, 255, 255));
 paint.setTextSize(blockSize * 10);
 
 canvas.drawText("BOOM!", blockSize * 4,
 blockSize * 14, paint);

 // Draw some text to prompt restarting
 paint.setTextSize(blockSize * 2);
 canvas.drawText("Take a shot to start again", 
 blockSize * 8,
 blockSize * 18, paint);

 // Start a new game
 newGame();
}

Most of the previous code is the same type of code as the draw method. In the previous code, we set blankBitmap to be viewed.

gameView.setImageBitmap(blankBitmap);

Fill the screen with a single color (in this case Red).

// Wipe the screen with a red color
canvas.drawColor(Color.argb(255, 255, 0, 0));

Set the color to use for future drawing.

// Draw some huge white text
paint.setColor(Color.argb(255, 255, 255, 255));

Set the text size to be quite large (blockSize * 10)

paint.setTextSize(blockSize * 10);

Draw a huge "BOOM" in roughly the centre of the screen.

canvas.drawText("BOOM!", blockSize * 4,
         blockSize * 14, paint);

Make the text size smaller again for a subtler message underneath "BOOM!".

// Draw some text to prompt restarting
paint.setTextSize(blockSize * 2);

Draw some text to prompt the player to take their first shot of the next game.

canvas.drawText("Take a shot to start again", 
      blockSize * 8,
      blockSize * 18, paint);

Restart the game ready to receive the first shot.

// Start a new game
newGame();

There is one final task. We need to draw the location of the player's shot on the grid.