My Project is in Java Swing.
I have a JPanel on which I am adding some images with .png extension (which are on JLabels) at center.
Now I want to add a line which will be partially on the JPanel & partially on that image.
Currently when I am adding a line, JPanel shows the line but when I resize the image & drag it to the image, the image hides the line.
What can be done so that the image doesn't hide my line & shows it on image?
You're probably better off drawing the image yourself and drawing the line over the top in the same control. Create a class that extends Canvas and in the paint method write your own code to paint the image and then draw the line.
Another option is to use JLayeredPane instead of JPanel as your main container and place a non-opaque (setOpaque(false)) JPanel on a higher layer
Use JLayeredPane.setLayer(yourPanel, highNumber) and fill your JLayeredPane using something like GridBagLayout or a simple custom LayoutManager.
You can then implement the custom painting on that panel.
You could try using JXLayer and defining a custom LayerUI for it that would draw the lines. These would then appear above the components you need to draw over.
This is a little more advanced and involves using a 3rd party (open source) custom component but will allow you to change you mind about what Swing component you use to render your images later.
I think this article best describes how to achieve what you want.
I've solved many similar issues to this in the past in a variety of ways and none have had the flexibility and maintainability of JXLayer.
Related
In a board game we are developping in Java we would like the gui to be overshadowed when the game is finished. We have a Jframe in which there is JPanel with the board on which there are some colored pawns and boxes (JButtons) and we would like that everything becomes a sort of black and white and grey. Is there an authomatic method in Java to do this in Java Components?
There are several different kinds of panes to look at that could achieve this, or something similar, if you are using Swing (which I assume from the tag, that you are).
You could use a Glass Pane. http://docs.oracle.com/javase/tutorial/uiswing/components/rootpane.html#glasspane
glass panes could be thought of as like a CSS overlay. They dis-allow interaction with components behind them.
Also, take a look at JXLayers and JLayers, they allow you to modify the way components are actually painted.
Good Luck!
Override paintComponent() (Or if you have some components added to the container it's better to override paintComponents() method).
Call
super.paintComponent(g);
Color semiColor=new Color(0,0,0,128);//the last param represents alpha
g.fillRect(semiColor);
I have been using jFrame to build a GUI. I had to insert images in the GUI, for which i inserted a label and put the image as an icon for the label. Now, i have to find out the position of the image in terms of the x and y co-ordinates and i am unable to do that. I have used
setLocaction(x,y);
but it still doesn't seem to work. I even disabled the layout manager by using
setLayout(null);
What is the possible solution for this problem?
Edit
Basically i am creating a Solar system GUI using Swing, so the positions of the planets are to be set by me. I being new to java, there is being some difficulty in implementing the layouts.
This isn't a layout issue at all, but a drawing and possibly an animation issue. If this were my project, I'd
First and foremost, separate out the program logic from its display, a la the MVC or Model-View-Control pattern, or one of its many variants.
Create one JPanel for the GUI's graphics and do all my drawing in this
I would not display my planet images using ImageIcons inside of JLabels.
Rather, I'd create a background image and draw my planet sprites inside of the drawing JPanel's paintComponent method.
I'd create non-GUI Planet classes that a non-GUI model would hold.
In the GUI portion of my program, I would associate a BufferedImage with each Planet, probably using a HashMap<Plant, Image>.
I'd then draw each Planet's associated image in the drawing JPanel's paintComponent(...) method, and place it depending on the Planet's position field values.
If I wanted to animate this, I'd use a Swing Timer to drive my simple animation.
With null layout you should use setSize and setLocation methods on you label to get your image visible correctly inside your frame.
I'm coding a simple graphics program in Java.
So, I have 3 classes.
The first class is the GUI w/c extends JFrame, it load the menu bar and panel (drawing class)
The second class is the drawing class, it extends JPanel, and it has simple Graphics commands.
The third class is an animation class, it displays an animation. It also extends JPanel.
So my question is this, how do I display the animation class in the panel of the GUI class. I want it to be displayed instead of drawing class. When I try to place it there, it displays a tiny box beside the drawing class panel. I am not very good at frames and panels. Thank you very much in advance!
All JPanels have a LayoutManager which, rather handily, manages how Components are laid out. The default layout is FlowLayout, which default mode will simply place each component to the right of the last component.
If you want to change the layout to something more useful, there are many options; BorderLayout, GridLayout, GridBag layout are popular ones. Myself, I use MigLayout, an external library which is very powerful :).
As for it appearing small, try manually enforcing the size with setSize(w, h) or setPreferredSize(w, h).
You might want to write
GUIFrame.remove(drawingPanel);
GUIFrame.add(animationPanel);
GUIFrame.pack();
However the behavior may vary if you have other components added to your GUIFrame. It is difficult to help you exactly because you have not posted an SSCCE.
So my question is this, how do I display the animation class in the panel of the GUI class. I want it to be displayed instead of drawing class.
Use a Card Layout.
I have a simple doubt, I need to replace this:
panel[1].setBackground(Color.red);
For an image, but I want to avoid a new jlabel for image, because I tested and I have another label inside this panel that is pushed to below
Background Panel shows two approaches. One involves custom painting, the other involves using a JLabel. The approach you use will be based on your requirement. The custom painting is more flexible but a little more complicated.
I have a simple GUI component written in Java. The class draws an analog clock in a java.awt.canvas.
This canvas is then contained in a JFrame - What I want to do is give the canvas a 3d "raised" effect - almost like adding a drop shadow to a photo.
Is there a simple way to do this?
If you are using a JFrame, then you have two options:
Add your own component to a JPanel first and then add this to the JFrame.
Instead of inheriting from java.awt.Canvas, you can inherit from JComponent. Then you would have to do all your painting in the paintComponent() Method instead of just paint() (you can just rename your current paint method).
In both cases you can now set a border with the setBorder() Method (on the JPanel or your component) you can get from BorderFactory.
See also: How to Use Borders
If you were using a Swing element, you'd use the createRaisedBevelBorder() method of the BorderFactory and set the canvas' border to the resulting border. Canvas is an AWT component, so you'll need to wrap it in a Swing component to which you can set the border.