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POHow to draw grid using swing class Java and detect mouse position when click and drag
 

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  1. POHow to draw grid using swing class Java and detect mouse position when click and drag
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    <p>I am trying to create a grid UI (5*5) using Swing classes. I tried a nested loop and adding a jPanel dynamically to the jFrame. And I also tried to change the background colour of each jPanel when user clicks and drops over it. But with my code there are huge gaps between each cell and I can't get the drag event to work.</p> <pre><code>public class clsCanvasPanel extends JPanel { private static final int intRows = 5; private static final int intCols = 5; private List&lt;JPanel&gt; jpllist = new ArrayList&lt;JPanel&gt;(); public clsCanvasPanel() { /* * * Add eventListener to individual JPanel within CanvasPanel * * * TODO : * 1) mousePressed --&gt; update Temperature and HeatConstant of clsElement Class * 2) start a new thread and * 3) call clsElement.run() method * * * Right Now : it updates the colours of the JPanel * */ MouseListener mouseListener = new MouseAdapter() { @Override public void mousePressed(MouseEvent e) { JPanel panel = (JPanel) e.getSource(); Component[] components = panel.getComponents(); for (Component component : components) { component.setVisible(!component.isVisible()); component.setBackground(new Color(255,255,0)); } panel.revalidate(); panel.repaint(); } }; //TODO : refactoring GridLayout gdlyPlates = new GridLayout(); gdlyPlates.setColumns(intCols); gdlyPlates.setRows(intRows); gdlyPlates.setHgap(0); gdlyPlates.setVgap(0); setLayout(gdlyPlates); //TODO : refactoring for (int row = 0; row &lt; intRows; row++) { for (int col = 0; col &lt; intCols; col++) { JPanel panel = new JPanel(new GridBagLayout()); panel.setOpaque(false); JPanel jl = new JPanel(); jl.setVisible(true); panel.add(jl); panel.addMouseListener(mouseListener); jpllist.add(panel); add(panel); } } } } </code></pre> <p>So now I am trying to create one panel and draw grids on it, then detects the mouse position on the grid, further change the colour of each cell.</p> <p>Could someone give me some advices on how to implement this grid on JPanel, and change the colour of a chosen cell.</p>
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