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Thread: Looking for Assistance with Graphing using Drawing Panel

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    Default Looking for Assistance with Graphing using Drawing Panel

    import java.awt.*;
     
    public class Program5 {
     
    	public static void main(String[] args) {
    		DrawingPanel panel = new DrawingPanel(300,500);
    		panel.setBackground(Color.white);
    		Graphics g = panel.getGraphics();
    		g.setFont(new Font("Helvetica", Font.PLAIN, 12));
    		double ball = 10;
    			for(int i=1; i<=20; i++){
    				ball=ball*0.8;	
    			g.drawLine(i*10, (int)(425-ball*50), i, i);
    	}
    			for(int j=0; j<=8; j++){
    			g.drawString(j+ "Meters", 225, 420-j*50);
    		}
    			g.drawString("Bounce Number", 75, 455);
    			g.drawString("1", 10, 440);
    			for(int k=1; k<=4; k++){
    			g.drawString((k*5)+"", k*50, 440);
    		}
     
    }
    }

    I'm fairly new to Java and am having a hard time with this particular assignment. The program runs and shows up on the drawing panel fine but I can't get the lines quite right.
    Capture.jpg

    These are what the lines should look like. Where should I start to fix it? Thank you very much for reading.


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    Default Re: Looking for Assistance with Graphing using Drawing Panel

    You are not using the standard technique for drawing.
    See the tutorial: Lesson: Performing Custom Painting (The Java™ Tutorials > Creating a GUI With JFC/Swing)

    Bascially create a class that extends JPanel, override the paintComponent() method and add all drawing code there. Create a JFrame and add the new class to that.

    Where is the class: DrawingPanel defined?
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Looking for Assistance with Graphing using Drawing Panel

    Welcome to the forum! Thanks for taking the time to learn how to post code correctly. If you haven't already, please read this topic to learn other useful info for new members.

    It appears that you're using "Building Java Programs: A Back to Basics Approach, by Stuart Reges and Marty Stepp." Their use of custom graphics "helper" classes that do most of the work required to draw graphics. The DrawingPanel class that you're using is not core Java, it's a class the authors of the book wrote to "help" students using the book.

    Most here know standard or core Java and the classes distributed by Oracle with the Java SDK. To help you, we'd have to learn the Reges and Stepp approach or already know it. Be patient, and someone may come along who can help, but I haven't seen this approach before on this forum, so it may be a long wait.

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