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POMandelbrot set and Julia set
 

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    <p>Sorry for the mess guys. Let me reparaphrase my problems. I am working on Mandelbrot and Julia set in Java. I had difficulties achieving "zoom in" and "zoom out" functions after the user drags to make a rectangle and then releases the mouse. Zoom in and Zoom out are options that can be selected from the menu bar.The code posted contains the function I add for zooming in(similar thing for zoom out,I deleted it for space), which does not work. The reason that I posted the entire code previously is for better letting you understand what these variables stand for since there are a bunch of variables so it's hard to figure it out if you just simply look at something like X,Y,A,B,etc. Also, I am a beginner so I am not able to simplify my code and make it work so far, sorry about that. Hope this would make sense.Thx.</p> <pre><code>// implement methods for menu bar items public void actionPerformed(ActionEvent e) { if (e.getSource() instanceof JMenuItem) { String s = e.getActionCommand(); } else if (s.equals("ZoomIn")) { // zoom in addMouseListener(new MouseAdapter() { public void MouseReleased(MouseEvent aa) { //double H = getHeight(); //double W = getWidth(); if (drag) { g.setPaintMode(); drag = false; if (mj) { a2 = a1 + mx2 * xyr; a1 = a1 + mx1 * xyr; b1 = b2 - my2 * xyr; b2 = b2 - my1 * xyr; dxal.setText("a:["+nf1.format(a1)+","+nf1.format(a2)+"]"); dybl.setText("b:["+nf1.format(b1)+","+nf1.format(b2)+"]"); if (a2 &gt; a1 &amp;&amp; b2 &gt; b1) { // H = H * 2; // W = W * 2; threadDraw(); } } else { x2 = x1 + mx2 * xyr; x1 = x1 + mx1 * xyr; y1 = y2 - my2 * xyr; y2 = y2 - my1 * xyr; dxal.setText("x:["+nf1.format(x1)+","+nf1.format(x2)+"]"); dybl.setText("y:["+nf1.format(y1)+","+nf1.format(y2)+"]"); if (x2 &gt; x1 &amp;&amp; y2 &gt; y1) { // H = H * 2; // W = W * 2; threadDraw(); } } } } } ); } </code></pre> <p>btw. I can send the entire code to anyone who might want to see to help better understand my problems. </p>
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    1. CODo you realize that you've posted hundreds of lines of code, most of it completely unrelated to the main problem? When trying to add a feature to a complex program, you are far better off testing and developing that feature in a much simpler program first, and then later when you've gotten it working in the simple program, adding it to your larger program. This way, if you get stuck in the smaller test program stage, you can post this smaller more manageable test program here for us to help you with rather than post a huge, gawd-awful, tl;dr program.
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    2. COTip: If you want a detailed image when zoomed in, you should use [`BigDecimal`](http://docs.oracle.com/javase/7/docs/api/java/math/BigDecimal.html) rather than `double`.
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    3. COI would first re-factor that huge god-class into more reasonable classes, separate out my logic/calculations/model from my view (the GUI), and solve the problem mainly in the model portion of the program.
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