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Thread: I need Help Creating A "for loop" for some really basic java code. Plz help

  1. #1
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    Unhappy I need Help Creating A "for loop" for some really basic java code. Plz help

    I am in university and have just started programming. we were told to create an image comprising of only squares circles and triangles and also to make it mov.
    i created a boat comprising of 4 squares and a triangle for the sail.
    the image is complete however when i compile it and run it each square moves at a different time so the boat doesn't look like its moving instead it looks like different shapes are moving at different times.
    i was told i could make all of the shapes move at the same time using a for loop moving each shape one pixel at a time however i have no idea how to implement this. here is the code below which i have written so far.
    somebody plz help

    public class Picture
    {
    	private Square ocean;
    	private Square boat;
    	private Triangle sail;
    	private	Circle sun;
    	private Square sail2;
    	private Square sail3;
    	private Square boat2;
     
    	/**
    	 * Constructor for objects of class Picture
    	 */
    	public Picture()
    	{
    		// nothing to do... instance variables are automatically set to null
    	}
     
    	/**
    	 * Draw this picture.
    	 */
    	public void draw()
    	{
    		ocean = new Square();
    		ocean.moveVertical(150);
    		ocean.changeSize(800);
    		ocean.makeVisible();
    		ocean.changeColor("blue");
    		ocean.moveHorizontal(-60);
     
    		boat = new Square();
    		boat.changeColor("black");
    		boat.moveHorizontal(20);
    		boat.moveVertical(100);
    		boat.makeVisible();
    		boat.changeSize(70);
     
     
    		boat2 = new Square();
    		boat2.makeVisible();
    		boat2.changeColor("black");
    		boat2.moveHorizontal(90);
    		boat2.moveVertical(100);
    		boat2.changeSize(70);
     
     
    		sail = new Triangle();	
    		sail.changeSize(100, 70);
    		sail.moveHorizontal(75);
    		sail.moveVertical(15);
    		sail.makeVisible();
    		sail.changeColor("red");
     
    		sail2 = new Square();
    		sail2.changeColor("black");
            sail2.changeSize(20);
            sail2.moveHorizontal(65);
            sail2.moveVertical(80);
            sail2.makeVisible();
     
            sail3 = new Square();
            sail3.changeColor("black");
            sail3.changeSize(20);
            sail3.moveVertical(80);
            sail3.moveHorizontal(40);
     
     
    		sun = new Circle();
    		sun.changeColor("yellow");
    		sun.moveHorizontal(350);
    		sun.moveVertical(-100);
    		sun.changeSize(90);
    		sun.makeVisible();
    	    sun.slowMoveVertical(110);
    	}
     
     
     
    	/**
    	 * Change this picture to black/white display
    	 */
    	public void setBlackAndWhite()
    	{
    		if(ocean != null)   // only if it's painted already...
    		{
    			ocean.changeColor("black");
    			boat.changeColor("white");
    			sail.changeColor("black");
    			sun.changeColor("black");
    		}
    	}
     
    	/**
    	 * Change this picture to use color display
    	 */
    	public void setColor()
    	{
    		if(ocean != null)   // only if it's painted already...
    		{
    			ocean.changeColor("red");
    			boat.changeColor("black");
    			sail.changeColor("green");
    			sun.changeColor("yellow");
    		}
    	}
     
    }
    Last edited by helloworld922; October 29th, 2009 at 10:21 PM.


  2. #2
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    Default Re: I need Help Creating A "for loop" for some really basic java code. Plz help

    you are going to have to use a for loop to move then a little bit at a time (each)

    I see 5 things here, 4 squares and a triangle
    boats 1 and 2, sails 1 2 and 3

    We can move it to the right like this, lets say ..move right by 90 pixels

    I am not sure how well this will work since it may happen very fast, try it and fiddle with it (try changing how much it moves every cycle? from 3 to 1 maybe ..maybe from 3 to 6?)

    for(int i=0; i < 30 ; ++i)
    {
    boat1.slowMoveHorizontal(3);
    boat2.slowMoveHorizontal(3);
    sail1.slowMoveHorizontal(3);
    sail2.slowMoveHorizontal(3);
    sail3.slowMoveHorizontal(3);
    }

    basically I will run the code in the { } 30 times,
    the first section declares a variable i and sets it to 0
    next it says keep running this code while i is still less than 30
    next it says to add 1 to i every time..

    Every time it runs it will move each boatpart a little bit...might look kinda funny though
    (notice it runs 30 times, and moves each time 3 pixels...total 90)

    in my opinion this is a stupid assignment to be teaching...for loops shouldn't be bothered with till you learn most of the even more basics...
    Last edited by rsala004; October 29th, 2009 at 05:22 PM.

  3. The Following 2 Users Say Thank You to rsala004 For This Useful Post:

    JavaPF (October 30th, 2009), Reiss (October 29th, 2009)

  4. #3
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    Default Re: I need Help Creating A "for loop" for some really basic java code. Plz help

    I got it to work!!!!!!!
    im so grateful for your help.
    thank you
    Last edited by Reiss; October 29th, 2009 at 08:06 PM.

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