From 0856194abd0b708ecd07785d7ccca62e02b797c3 Mon Sep 17 00:00:00 2001
From: yangxvlin <1768528843@qq.com>
Date: Wed, 31 Mar 2021 22:51:05 +1100
Subject: [PATCH] finish Q3b
---
src/Q3.java | 24 +++++++++++++++++++++++-
1 file changed, 23 insertions(+), 1 deletion(-)
diff --git a/src/Q3.java b/src/Q3.java
index 9db0cbd..3fac7aa 100644
--- a/src/Q3.java
+++ b/src/Q3.java
@@ -22,13 +22,35 @@ public class Q3 extends AbstractGame {
private final Image playerImage = new Image(PLAYER_IMAGE);
private final Image ballImage = new Image(BALL_IMAGE);
+ // (b) The player should be able to move left, right, up, and down, using the respective arrow keys at a
+ //constant step size (in pixels per frame). Try different values for the step size (a constant named as
+ //STEP SIZE), starting at 1.
+ private static final double STEP_SIZE = 1;
+
+ private double playerX = PLAYER_POSITION.x;
+ private double playerY = PLAYER_POSITION.y;
+
public static void main(String[] args) {
new Q3().run();
}
@Override
protected void update(Input input) {
- playerImage.draw(PLAYER_POSITION.x, PLAYER_POSITION.y);
+ // (b)
+ if (input.isDown(Keys.LEFT)) {
+ playerX -= STEP_SIZE;
+ }
+ if (input.isDown(Keys.RIGHT)) {
+ playerX += STEP_SIZE;
+ }
+ if (input.isDown(Keys.UP)) {
+ playerY -= STEP_SIZE;
+ }
+ if (input.isDown(Keys.DOWN)) {
+ playerY += STEP_SIZE;
+ }
+
+ playerImage.draw(playerX, playerY);
ballImage.draw(BALL_POSITION.x, BALL_POSITION.y);
}
}
--
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