The content pane of a JFrame has a BorderLayout. If you place a component in a BL with no constraints it ends up in the CENTER. The center can only display one component. For an immediate effect, I suggest: f.add(top, BorderLayout.PAGE_START); f.add(mid); f.add(bot, BorderLayout.PAGE_END); Other points. Take out f.setSize(500, 500); and call pack() immediately before … Read more
So basically what I need is to get new window dimension into the move() method in the Rect class. Don’t know if it is the best design but I pass the “panel” as a parameter to the “move()” method so its width/height can be used. Here is some old code I have lying around that … Read more
There are any number of ways this might be achieved. You Could… Disclaimer Cavet, using a JLabel for this purpose may result in the contents over spilling the continer, see below for more details Create a JLabel, apply the image to it’s icon property and set this as the frames content pane. You would then … Read more
Usage depends on whether the component’s parent has a layout manager or not. setSize() — use when a parent layout manager does not exist; setPreferredSize() (also its related setMinimumSize and setMaximumSize) — use when a parent layout manager exists. The setSize() method probably won’t do anything if the component’s parent is using a layout manager; … Read more
It’s not clear why you’re passing around byte[], but it looks like you want to update a component’s Icon with a gray thumbnail. The example below creates grayscale icons from existing sample icons and uses setIcon() to do the update. A similar approach works with any Image. See also this example that suggests ColorConvertOp, and … Read more
Here first watch this small example, do let me know if you understood what is going on in here. Then only we will go a step further, slowly slowly. Try to go through this example, in which I am showing you how to draw on a JPanel import java.awt.*; import java.awt.image.BufferedImage; import java.io.IOException; import java.net.URL; … Read more
It may be easier to draw lines using the following approach: click to mark the first endpoint drag to show the line in progress release to mark the second endpoint This related example may offer some additional guidance. Addendum The example below implements the outline above. I’ve update the example to show how to use … Read more
If you are using JPanels, then are probably working with Swing. Try this: BufferedImage myPicture = ImageIO.read(new File(“path-to-file”)); JLabel picLabel = new JLabel(new ImageIcon(myPicture)); add(picLabel); The image is now a swing component. It becomes subject to layout conditions like any other component.
Well, the quickest and easiest solution is to use Image.getScaledInstance g.drawImage(img.getScaledInstance(newWidth, -1, Image. SCALE_SMOOTH), x, y, this); If your wondering about the negative number, the java docs say: If either width or height is a negative number then a value is substituted to maintain the aspect ratio of the original image dimensions. If both width … Read more
Get a map of the United States Draw it on a JPanel Add a click handler to the JPanel In the click handler, retrieve information where the user clicked from the event Have a set of polygons of all the state boundaries Iterate through all the poloygons to check if the user clicked inside one … Read more