I am making a missile command clone and have missiles firing from both the top and the bottom. In order to add some spontaneity to the game and allow the player to aim the missiles I have the missile turn towards a certain point every time the act method is called, both the missiles created by the player and those which are "enemy" missiles have the same class. This works fine for the missiles coming from the bottom of the screen but the ones coming from the top - those which are not spawned by the player - will almost always move straight downwards for a period of time before sometimes switching their direction. To fix this I created a separate missile class in order to solve the problem which is almost identical except the code for setting the angle.
In the new class so far I have tried:
-Using turnTowards() only once and once the missile has reached a certain point | sometimes works but not consistently
-Setting the rotation manually with setRotation() using a randomly generated angle between 45 and 135 | same results
-Setting the rotation manually with setRotation() after calculating the angle between the start and end points | used both regular calculation and Law of Sines but neither gave different results from he first two.
What could be causing this problem?
Here is my code for both the old missiles class and new one.
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 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 | import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)import java.awt.Color;import java.util.Random;/** * New Missile class */public class CompoundMissile extends Actor{ private Color contrailcolor; private int xcoordinate, ycoordinate, startx, starty, speed, rotation; private Contrail contrail = new Contrail(); private boolean end = false, start = true; private Random generator = new Random(); private int[][] coordinates = new int[][]{{92, 415}, {138, 412}, {187, 414}, {297, 412}, {358, 403}, {415, 412}, {45, 410}, {245, 410}, {477, 410}}; /** * Constructor - sets the image and contrail color * * @param color the contrails color * @param setspeed the speed of the missile */ public CompoundMissile(Color color, int setspeed) { setImage(new FluidImage("MissileHead.txt", 2, 2)); contrailcolor = color; setRotation(90); rotation = 130; speed = setspeed; } /** * Act - do whatever the Missile wants to do. This method is called whenever * the 'Act' or 'Run' button gets pressed in the environment. */ public void act() { if(start) { startx = getX(); starty = getY(); int lastposition = generator.nextInt(147) + startx - 1; if(startx - lastposition > 0) rotation = 90 - (int)Math.toDegrees(Math.asin((double)(Math.abs(startx - lastposition))/(double)(Math.sqrt(21609 + (Math.abs(startx - lastposition) * Math.abs(startx - lastposition)))))); else rotation = 90 + (int)Math.toDegrees(Math.asin((double)(Math.abs(startx - lastposition))/(double)(Math.sqrt(21609 + (Math.abs(startx - lastposition) * Math.abs(startx - lastposition)))))); System.out.println(startx); System.out.println(lastposition); System.out.println((double)Math.abs(startx - lastposition)); System.out.println((double)(Math.abs(startx - lastposition))/(double)(150-3)); System.out.println(Math.asin((double)(Math.abs(startx - lastposition))/(double)(150-3))); System.out.println(Math.toDegrees(Math.asin((double)(Math.abs(startx - lastposition))/(double)(150-3)))); System.out.println((int)Math.toDegrees(Math.asin((double)(Math.abs(startx - lastposition))/(double)(150-3)))); System.out.println(90 - (int)Math.toDegrees(Math.asin((double)(Math.abs(startx - lastposition))/(double)(150-3)))); System.out.println(90 + (int)Math.toDegrees(Math.asin((double)(Math.abs(startx - lastposition))/(double)(150-3)))); start = false; } if(getY() == 40) setRotation(rotation); move(speed); if(getY() >= 150) end = true; if(getOneIntersectingObject(Explosion.class) != null) { Explosion explosion = (Explosion)getOneIntersectingObject(Explosion.class); if(((FluidImage)getImage()).compareHitboxs(explosion.getHitbox(),explosion.getX(), explosion.getY(), getX(), getY())) end = true; } if(end) { getWorld().addObject(new Explosion(), getX(), getY()); getWorld().removeObject(this); } } } |
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 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 | import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)import java.awt.Color;/** * Old Missile class * * @author Xevinaly * @version v0.1.0 */public class Missile extends Actor{ private Color contrailcolor; private int xcoordinate, ycoordinate, startx, starty; private Contrail contrail = new Contrail(); private boolean end = false, start = true; /** * Constructor - sets the image and contrail color * * @param color the contrails color * @param endx x-coordinate to turn towards * @param endy y-coordinate to turn towards */ public Missile(Color color, int endx, int endy) { setImage(new FluidImage("MissileHead.txt", 2, 2)); contrailcolor = color; xcoordinate = endx; ycoordinate = endy; } /** * Act - do whatever the Missile wants to do. This method is called whenever * the 'Act' or 'Run' button gets pressed in the environment. */ public void act() { if(start) { startx = getX(); starty = getY(); turnTowards(xcoordinate, ycoordinate); start = false; } move(10); if(getY() <= ycoordinate) end = true; if(getOneIntersectingObject(Explosion.class) != null) { Explosion explosion = (Explosion)getOneIntersectingObject(Explosion.class); if(((FluidImage)getImage()).compareHitboxs(explosion.getHitbox(),explosion.getX(), explosion.getY(), getX(), getY())) { xcoordinate = getX(); ycoordinate = getY(); end = true; } } if(end) { getWorld().addObject(new Explosion(), xcoordinate, ycoordinate); getWorld().removeObject(this); } } } |
