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Thread: For Loop Delay Help, Visibility Manipulation Assistance

  1. #1
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    Default For Loop Delay Help, Visibility Manipulation Assistance

    Hey All!
    I am a beginner programmer (actually am technically not even a programmer, I am a designer). My major is multimedia so I am a bit of a jack of all trades, thus, am required to learn how to manipulate basic code so that I will be able to better communicate with any real programmers I encounter and work with on the job! Our final project was to create a simple program of our own. Mine is below, but I have 2 problems I can't seem to solve. They are:

    1. Slowing down the "movement" of the eggs.

    2. Hiding the "busted egg" components until all prior for loops for the whole eggs have executed their movements down their respective ramps

    If any of you can solve ANY 1 of these issues, I will be forever grateful. I have been trying for days with no luck. Here is my code:

    import java.awt.Color;
    import java.awt.Graphics;
    import javax.swing.JPanel;
    import javax.swing.Timer;
    import java.awt.event.ActionListener;
    import java.awt.event.ActionEvent;
    import java.util.Random;
     
    public class finalB extends JPanel
    {
     
     //integer variable setup
    	int x, y, x1, y1, i, del; // these are all defined as integers  
     
    	// display library class-- load premade java component code
       public void paintComponent( Graphics g )
       {
          super.paintComponent( g ); //call superclass' paint method from library
     
    		this.setBackground( Color.BLACK );
     
    		//draw walls
    		g.setColor( Color.BLUE );
    		g.fillRoundRect( 5, 5, 5, 400, 2, 2 ); //(x, y, w, l, curvature of rounds x2) LEFT WALL
    		g.fillRoundRect( 165, 5, 5, 400, 2, 2 ); // RIGHT WALL
    		g.fillRoundRect( 3, 552, 168, 5, 2, 2 ); // BOTTOM FLOOR
     
    		//draw ramps
    		g.setColor( Color.CYAN );
    		g.drawLine( 18, 40, 118, 55 ); //first 2 integers are 1st point, second 2 are 2nd point
    		g.drawLine( 60, 110, 157, 95 );
    		g.drawLine( 18, 155, 118, 175 );
    		g.drawLine( 60, 235, 157, 220 );
    		g.drawLine( 18, 285, 118, 300 );
    		g.drawLine( 60, 360, 157, 345 );
     
    		//start 1st white egg's for loop here - MOVES 1st ramp's eggs each iteration according to the math in the loop. giving it a less than 10 definition: means it will repeat until i has been made 9 times.
    			for ( i=0; i<10; i++ ){
     
    			g.setColor( Color.WHITE );
    			g.fillOval( 20 + i*10, 16, 18, 23 ); //x, y, w, h - FIRST egg position, this MAKES eggs (i*??)
    			//g.fillOval( 110, 33, 23, 18 ); // - TENTH egg's position; right now this line is not doing anything, it's just here to show about where the 1st egg should stop
     
    			//1st BLACK eggs - these hide the white ones to create the illusion of 1 egg moving
    			g.setColor( Color.BLACK );
    			g.fillOval( 23 + i*10, 16, 23, 18 );
    			//g.fillOval( 110, 33, 23, 18 ); // - final 1st egg's supposed position		
    		} //end 1st ramp's eggs for loop
     
    			//2nd eggs' for loop here
    			for ( i=10; i>0; i-- ){
     
    			g.setColor( Color.WHITE );
    			g.fillOval( 59 + i*8, 76, 23, 18 ); 
     
    			//2nd BLACK eggs
    			g.setColor( Color.BLACK );
    			g.fillOval( 61 + i*4, 76, 18, 23 ); //NOTE: this egg isn't in the right spot, I will have to change it later to start at the right end of the ramp instead of the left.
    		} //end 2nd ramp's eggs' for loop
     
    			//3rd white egg's for loop here.
    			for ( i=0; i<10; i++ ){
     
    			g.setColor( Color.WHITE );
    			g.fillOval( 16 + i*10, 131, 18, 23 ); 
     
    			//3rd BLACK eggs
    			g.setColor( Color.BLACK );
    			g.fillOval( 19 + i*10, 131, 23, 18 );
    		} //end 3rd ramp's eggs' for loop
     
    			//4th eggs' for loop here
    			for ( i=10; i>0; i-- ){
     
    			g.setColor( Color.WHITE );
    			g.fillOval( 59 + i*8, 201, 23, 18 ); 
     
    			//4th BLACK eggs
    			g.setColor( Color.BLACK );
    			g.fillOval( 61 + i*4, 201, 18, 23 );
    		} //end 4th ramp's eggs' for loop
     
    			//5th white egg's for loop here.
    			for ( i=0; i<10; i++ ){
     
    			g.setColor( Color.WHITE );
    			g.fillOval( 16 + i*10, 262, 18, 23 ); 
     
    			//5th BLACK eggs
    			g.setColor( Color.BLACK );
    			g.fillOval( 19 + i*10, 262, 23, 18);
    		} //end 5th ramp's eggs' for loop
     
    			//6th eggs' for loop here
    			for ( i=10; i>0; i-- ){
     
    			g.setColor( Color.WHITE );
    			g.fillOval( 59 + i*8, 327, 23, 18 ); 
     
    			//6th BLACK eggs
    			g.setColor( Color.BLACK );
    			g.fillOval( 61 + i*4, 327, 18, 23 );
    		} //end 6th ramp's eggs' for loop
     
    		//"~~~" find a way to have all the 'busted egg' bits below not appear until the last "whole" black eggs are done moving down the final (5th) ramp
     
    		//busted egg
    		g.setColor( Color.WHITE );
    		g.fillOval( 59, 527, 18, 23 ); //main chunk
    		g.fillRect( 42, 478, 5, 3 ); //x, y, w, h - little bits start
    		g.fillRect( 80, 491, 3, 4 );
    		g.fillOval( 130, 500, 4, 3 );
    		g.fillOval( 140, 470, 3, 4 );
    		g.fillOval( 54, 482, 4, 4 );
     
    		//busted egg yolk
                    g.setColor( Color.YELLOW );
    		g.fillRoundRect( 20, 500, 3, 3, 1, 1 ); //(x, y, w, l, curvature of rounds x2)
    		g.fillRect( 50, 484, 3, 3 ); //x, y, w, h
    		g.fillRect( 85, 492, 3, 4 );
    		g.fillOval( 100, 505, 3, 3 );
    		g.fillOval( 130, 460, 3, 4 );
    		g.fillOval( 54, 472, 4, 4 );
     
    		//busted egg shaping (hiding bits of colored shapes previously made)
    		g.setColor( Color.BLACK );
    		g.fillRect( 62, 525, 13, 16 ); //x, y, w, l
    		g.fillRect( 60, 535, 3, 4 );
    		g.fillRect( 74, 535, 3, 4 );
    		g.fillRect( 57, 529, 23, 8 );
    		g.setColor( Color.YELLOW );
    		g.fillRoundRect( 63, 540, 10, 3, 1, 1 );
     
       } // end method main
    } // end class finalB

    --- Update ---

    Here is the sister file that actually runs the finalB file.
     
    //creation of frame and execution of program - the run file 
     
    import java.awt.Color;
    import javax.swing.JFrame;
     
    public class finalA
    {
       // execute application - run this one
    	// This is like the HTML to your CSS file. It sets up your applet window.
       public static void main( String[] args )
       {
          //create frame for LinesRectsOvalsJPanel
    		JFrame frame =
    			new JFrame( "Rolling Egg" );
    			frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
     
    			finalB finBInsta = 
    				new finalB();
    			finBInsta.setBackground( Color.BLACK );
    			frame.add( finBInsta ); //add panel to frame
    			frame.setSize( 191, 600 ); // set frame size w, h
    			frame.setVisible( true ); //display frame
     
    		   } // end main
    } // end class finalA

    Also, integers x1, y1, and del are all being unused currently. I added them to remind myself I might be able to use them to create a delay (del), and to move the eggs downward as they are made as well (x1, y1).
    Last edited by 3r1c4; April 30th, 2013 at 11:37 PM. Reason: I changed the code.


  2. #2
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    Default Re: For Loop Delay Help, Visibility Manipulation Assistance

    The compiler expects a numeric value, followed by a ,
    133 i*10 is not a valid value. there needs to be an operator after the 133 that connects the two parts to make a valid numeric value
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: For Loop Delay Help, Visibility Manipulation Assistance

    Thank you! That problem was just me not noticing I'd forgotten a "+" sign between the x value and the i*10! Now I need help delaying the movement of the eggs.

  4. #4
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    Default Re: For Loop Delay Help, Visibility Manipulation Assistance

    help delaying the movement of the eggs.
    What does "delaying the movement" mean? Can you describe how the eggs are moving and what it would mean to "delay" the movement?
    If you don't understand my answer, don't ignore it, ask a question.

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    Wink Re: For Loop Delay Help, Visibility Manipulation Assistance

    Quote Originally Posted by Norm View Post
    What does "delaying the movement" mean? Can you describe how the eggs are moving and what it would mean to "delay" the movement?
    Delaying the movement means slowing down how quickly the for loops create and or place each egg. Their "movement" is how they appear to move across each ramp (or at least I am trying to get it to look like they're moving-- right now the program just makes them all so fast it looks like a plain old row of eggs).

    for ( i=0; i<10; i++ ){
    	g.setColor( Color.WHITE );
    	g.fillOval( 20 + i*10, 16, 18, 23 );
    }

    Thank you for being patient with me!

  6. #6
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    Default Re: For Loop Delay Help, Visibility Manipulation Assistance

    To change the location slowly over time, the code will need to use a Timer. The Timer's method will compute the next position of the egg and call the repaint() method which will cause the paintComponent() method to be called where the egg will be displayed at the new position.
    If you don't understand my answer, don't ignore it, ask a question.

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