2020/4/24
1 | MouseInfo m = Greenfoot.getMouseInfo(); |
1 | if (m != null) { // ... |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 | import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)public class Background extends World{ public Background() { // Leave the next four lines alone super(1000, 800, 1, false); getBackground().setColor( new Color (79, 13, 150)); getBackground().fill(); setPaintOrder( Magic8Ball.class, TriangleAnswer.class ); //1) Use the showText method to display "Ask a Question Out Loud" // at the center of the screen near the top. showText("Ask A Question Out Loud", getWidth()/2, getHeight()/30); //2) Use the showText method to display "Then shake the Magic 8 Ball!" // at the center of the screen near the top, below the other text. showText("Then Shake The Magic 8 Ball!", getWidth()/2, getHeight()/30 + 20); //3) Build a Magic8Ball and place it in the center of the screen Magic8Ball ball = new Magic8Ball(); addObject(ball, getWidth()/2, getHeight()/2); }} |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 | import greenfoot.*;public class Magic8Ball extends SmoothMover{ //Leave this field alone, this will be the Triangle on the screen private TriangleAnswer triangle = new TriangleAnswer(); MouseInfo m = Greenfoot.getMouseInfo(); int mx = m.getX(); int my = m.getY(); public void act() { // Ask if the mouse has been dragged on the current object // If so, build a MouseInfo variable and get the mouse from Greenfoot // Teleport to the location of the Mouse // Ask if you are touching a TriangleAnswer // If so, remove the TriangleAnswer if(m.getActor() == this) { setLocation(mx, my); if(isTouching(TriangleAnswer.class)) { getWorld().removeObject(triangle); } } // Ask if the mouse has stopped being dragged on the current object // If so, call triangle's randomize method // Create two variables, xMove and yMove, set them to // a random value from {-100, -99, -98, ... 99, 100 } // add the triangle to the world at (yourX + xMove, yourY + yMove) if (m.getActor() != this) { triangle.randomize(); int xMove = (int)(Math.random()*201)-100; int yMove = (int)(Math.random()*201)-100; getWorld().addObject(triangle, getX() + xMove, getY() + yMove); } } } |
1 | if (m != null && m.getActor() == this) |
