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PongWithScenes works just like the
Ucigame version of Pong, except that it also has an
instructions screen shown initially.
Press any keyboard key to proceed to the Pong game,
which is a simple version of the traditional video game.
There is only one paddle, and no scoring.
Press Space to toggle between normal speed and slow speed (implemented as two different scenes). |
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PongWithScenes.java
// This version of Pong is implemented with three scenes:
// "Instructions" "PlayGame" and "PlayGameSlowly"
import ucigame.*;
public class PongWithScenes extends Ucigame
{
Sprite ball;
Sprite paddle;
boolean startPlayGameHasRun = false;
boolean startPlayGameSlowlyHasRun = false;
public void setup()
{
window.size(250, 250);
window.title("Pong");
framerate(30);
setIconImage(getImage("images/ball.gif", 255, 0, 0));
ball = makeSprite(getImage("images/ball.gif", 255, 0, 0));
paddle = makeSprite(getImage("images/paddle.png"));
ball.position(canvas.width()/2 - ball.width()/2,
canvas.height()/2 - ball.height()/2);
paddle.position(canvas.width() - paddle.width() - 10,
(canvas.height() - paddle.height()) / 2);
keyboard.typematicOff(keyboard.SPACE);
startScene("Instructions");
}
///////////////////////
public void startInstructions()
{
canvas.background(0, 0, 255);
String[] fontlist = arrayOfAvailableFonts();
println("fontlist[3]: " + fontlist[3]); // arbitrarily choose fourth font
canvas.font(fontlist[3], BOLD, 12);
}
public void drawInstructions()
{
canvas.clear();
canvas.putText("Avoid missing ball for high score", 5, 100);
}
// Press any key to start game.
public void onKeyPressInstructions()
{
startScene("PlayGame");
}
///////////////////////
public void startPlayGame()
{
ball.motion(6, 3);
Image bkg = getImage("images/background.png");
canvas.background(bkg);
startPlayGameHasRun = true;
}
public void drawPlayGame()
{
if (!startPlayGameHasRun)
println("drawPlayGame running before startPlayGame.");
canvas.clear();
ball.move();
ball.bounceIfCollidesWith(paddle);
ball.bounceIfCollidesWith(TOPEDGE, BOTTOMEDGE, LEFTEDGE, RIGHTEDGE);
paddle.stopIfCollidesWith(TOPEDGE, BOTTOMEDGE, LEFTEDGE, RIGHTEDGE);
paddle.draw();
ball.draw();
}
public void onKeyPressPlayGame()
{
// Arrow keys and WASD keys move the paddle
if (keyboard.isDown(keyboard.UP, keyboard.W))
paddle.nextY(paddle.y() - 2);
if (keyboard.isDown(keyboard.DOWN, keyboard.S))
paddle.nextY(paddle.y() + 2);
if (keyboard.isDown(keyboard.LEFT, keyboard.A))
paddle.nextX(paddle.x() - 2);
if (keyboard.isDown(keyboard.RIGHT, keyboard.D))
paddle.nextX(paddle.x() + 2);
if (keyboard.isDown(keyboard.SPACE))
{
println("Switch to slow");
startScene("PlayGameSlowly");
}
}
///////////////////////
public void startPlayGameSlowly()
{
ball.motion(2, 1);
startPlayGameSlowlyHasRun = true;
}
public void drawPlayGameSlowly()
{
if (!startPlayGameSlowlyHasRun)
println("drawPlayGameSlowly running before startPlayGameSlowly.");
canvas.clear();
ball.move();
ball.bounceIfCollidesWith(paddle);
ball.bounceIfCollidesWith(TOPEDGE, BOTTOMEDGE, LEFTEDGE, RIGHTEDGE);
paddle.stopIfCollidesWith(TOPEDGE, BOTTOMEDGE, LEFTEDGE, RIGHTEDGE);
paddle.draw();
ball.draw();
}
public void onKeyPressPlayGameSlowly()
{
// Arrow keys and WASD keys move the paddle
if (keyboard.isDown(keyboard.UP, keyboard.W))
paddle.nextY(paddle.y() - 1);
if (keyboard.isDown(keyboard.DOWN, keyboard.S))
paddle.nextY(paddle.y() + 1);
if (keyboard.isDown(keyboard.LEFT, keyboard.A))
paddle.nextX(paddle.x() - 1);
if (keyboard.isDown(keyboard.RIGHT, keyboard.D))
paddle.nextX(paddle.x() + 1);
if (keyboard.isDown(keyboard.SPACE))
{
println("Switch to normal");
startScene("PlayGame");
}
}
}
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