事情是这样的,基本上我必须有一个代码,其中有一个桶可以接住掉落的水果,每次接住它时,你都会得到一个新水果掉落的分数。
所以我知道如何让桶移动,以及如何让水果到达底部后再次移动。但是,我不知道如何让它真正落下。到目前为止,我有一个开关,但不知道该怎么用它。我在随机的地方突然出现了水果,这是一个开始。无论如何,这是我的代码。感谢所有帮助。再说一遍,一旦其中一个到达底部,我需要随机掉落一个水果。
import java.awt.Color;
import java.awt.event.KeyEvent;
import acm.graphics.GOval;
import acm.graphics.GPolygon;
import acm.graphics.GRect;
import acm.program.GraphicsProgram;
import acm.util.RandomGenerator;
import java.awt.event.*;
public class FruitCatcher extends GraphicsProgram {
private static final int APPLET_WIDTH = 500;
private static final int APPLET_HEIGHT = 500;
private static final int BUCKET_X = 250;
private static final int BUCKET_Y = 500;
private static final int BUCKET_SPEED = 10;
private static final int BUCKET_SPEED2 = -10;
private GPolygon Bucket;
public void init() {
setSize(APPLET_WIDTH, APPLET_HEIGHT);
addKeyListeners();
}
public void run() {
RandomGenerator random = new RandomGenerator();
makeBucket();
for (int i = 1; i <= 3; i++) {
int randomX = random.nextInt(0, 300 - 20);
addFruit(i, randomX, 0);
}
while (true)
;
}
public void makeBucket() {
Bucket = new GPolygon(BUCKET_X, BUCKET_Y);
Bucket.addVertex(-60, 0);
Bucket.addVertex(-70, -85);
Bucket.addVertex(10, -85);
Bucket.addVertex(0, 0);
add(Bucket);
Bucket.setFilled(true);
Bucket.setFillColor(Color.GRAY);
}
public void addFruit(int a, int x, int y) {
switch (a) {
case 1:
GRect Banana = new GRect(x, y, 10, 60);
Banana.setColor(Color.YELLOW);
Banana.setFilled(true);
add(Banana);
break;
case 2:
GOval lime = new GOval(x, y, 20, 20);
lime.setColor(Color.GREEN);
lime.setFilled(true);
add(lime);
break;
case 3:
GOval Orange = new GOval(x, y, 30, 30);
Orange.setColor(Color.ORANGE);
Orange.setFilled(true);
add(Orange);
}
}
public void keyPressed(KeyEvent event) {
int keyCode = event.getKeyCode();
switch (keyCode) {
case KeyEvent.VK_LEFT:
if (Bucket.getX() > 0) {
Bucket.move(-BUCKET_SPEED, 0);
}
break;
case KeyEvent.VK_RIGHT:
if (Bucket.getX() < APPLET_WIDTH) {
Bucket.move(BUCKET_SPEED, 0);
}
break;
}
}
}
在我的代码中,您可以看到一段时间(正确)我只是假设那是我要编写它的地方。然而,我有点不知所措。
最佳答案
- 您需要保留所有水果的引用列表,以便以后可以操作它们
- 游戏循环的每次迭代,将每个水果向下移动
你可能想实现一些定时机制,以便水果 速度不依赖于 CPU 速度。
package jsyn; import java.awt.Color; import java.awt.Component; import java.awt.event.KeyEvent; import java.util.ArrayList; import java.util.List; import acm.graphics.GOval; import acm.graphics.GPolygon; import acm.graphics.GRect; import acm.program.GraphicsProgram; import acm.util.RandomGenerator; import java.awt.event.*; public class FruitCatcher extends GraphicsProgram { private static final int APPLET_WIDTH = 500; private static final int APPLET_HEIGHT = 500; private static final int BUCKET_X = 250; private static final int BUCKET_Y = 500; private static final int BUCKET_SPEED = 10; private static final int BUCKET_SPEED2 = -10; //Speed of fruit falling private static final int FRUIT_PX_PER_MS = 10; private GPolygon Bucket; public void init() { setSize(APPLET_WIDTH, APPLET_HEIGHT); addKeyListeners(); fruits = new ArrayList<Component>(); } // Keep list of fruits List<GObject> fruits; public void run() { RandomGenerator random = new RandomGenerator(); makeBucket(); for (int i = 1; i <= 3; i++) { int randomX = random.nextInt(0, 300 - 20); addFruit(i, randomX, 0); } long last = System.currentTimeMillis(); while (true) { long current = System.currentTimeMillis(); update(current - last); last = current; } } void update(long delta) { for (GObject fruit : fruits) { //this code may not work, replace with code that moves fruit down fruit.setLocation(fruit.getX(), fruit.getY() + delta * FRUIT_PX_PER_MS); } } public void makeBucket() { Bucket = new GPolygon(BUCKET_X, BUCKET_Y); Bucket.addVertex(-60, 0); Bucket.addVertex(-70, -85); Bucket.addVertex(10, -85); Bucket.addVertex(0, 0); add(Bucket); Bucket.setFilled(true); Bucket.setFillColor(Color.GRAY); } public void addFruit(int a, int x, int y) { switch (a) { case 1: GRect Banana = new GRect(x, y, 10, 60); Banana.setColor(Color.YELLOW); Banana.setFilled(true); add(Banana); fruits.add(Banana); break; case 2: GOval lime = new GOval(x, y, 20, 20); lime.setColor(Color.GREEN); lime.setFilled(true); add(lime); fruits.add(lime); break; case 3: GOval Orange = new GOval(x, y, 30, 30); Orange.setColor(Color.ORANGE); Orange.setFilled(true); add(Orange); fruits.add(Orange); } } public void keyPressed(KeyEvent event) { int keyCode = event.getKeyCode(); switch (keyCode) { case KeyEvent.VK_LEFT: if (Bucket.getX() > 0) { Bucket.move(-BUCKET_SPEED, 0); } break; case KeyEvent.VK_RIGHT: if (Bucket.getX() < APPLET_WIDTH) { Bucket.move(BUCKET_SPEED, 0); } break; } } }
关于java - 我如何在这段代码中使随机对象移动?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/33817438/