I am creating a game on java, and I would like to reset the whole canvas after painting on the screen. I would like to do this by adding a button on the side of the game, but I am not sure where to add this in my code. The general format of the code is SandLab.java. Would anyone know what area to implement this in?
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button[currRow][currCol].setBackground(Color.RED);
button[currRow][currCol].setContentAreaFilled(true);
button[currRow][currCol].setOpaque(true);
That's what I have right now for my connect four game to denote a red player's move.
At the moment, it only colors the background and if I change my code to button[currRow][currCol].setForeground(Color.RED) then the whole thing just appears to not change. How would I fix this?
This is not easily achievable. The problem is that the pluggable look and feel paints the button content, and it does so in whatever way it sees fit. For instance, some L&F might paint a gradient which does not use the background color.
I suggest for a case such as yours to use a custom image (JButton.setIcon()) and no content area (JButton.setContentAreaFilled(false)).
Alternatively, you could create a custom component which draws the element itself, overriding JComponent.paintComponent().
Currently in a top down game I am developing, I want the player to always be in the center of the screen.
To accomplish this, I am just moving the background down when I want the player to move up, and vice versa.
However, now that I am adding enemies and other objects into the game, I want to avoid the movement getting all wonky when the map moves behind them while they are trying to move also.
Is there any way I can move what the JFrame is viewing up, without changing the coordinates of the background image?
For a better explanation of what I am trying to accomplish, look at the drawing below.
Is what I am trying to accomplish too complicated? Is there an easier way to do this?
This question already has an answer here:
How to define multiple JButton actions from a different class
(1 answer)
Closed 6 years ago.
So the program draws a car and I'm going to make three buttons, one for flash to initialize the flashing ability, one left, to move the car one space to the left and one right, to move the car one space to the right. My question is how do I make it change color each time I press the button? So to sum it up, I don't know how to have an object change it's color each time the button is pressed while flashing is on. I assume I use paint()
Any help would be appreciated.
If you are drawing an image, you will need to load a different image file which is a different color, and then draw that image instead. You will do this inside whatever method you are currently using to draw the car.
If you are drawing a shape or text of some kind, you can call g.setColor() on the graphics object passed to the paint() or paintComponent() method before drawing the shape.
There are any number of ways to do it. The basic requirement though, is to have a Object of some kind which you can tell when it should change color, it would then undertake the appropriate action and update the UI accordingly.
You could...
Use a simple JPanel as the representation of the object and simply call it's setBackground color method when you want it to change color.
This assumes you want to make use of a LayoutManager to position the panel. While it is certainly doable, it will require some thought into the overall design
You could...
Use a JPanel and override it's paintComponent method and paint the color change there. At the simplest level, this is overkill, but if you also want to draw a "car" or an image of "car", then this becomes a little more meaningful, especially if you want to rotate the car based on the direction it's moving
See Painting in AWT and Swing, Performing Custom Painting and 2D Graphics for more details
Flashing
I assume you mean you want the object to be animated in some way and "blink" on and off.
This can easily be accomplished through the use of a Swing Timer which can be used to change the state of a simple flag which changes the way in which the component is rendered.
See How to use Swing Timers for more details
The important concept to take away from this is to create a object which encapsulates the requirements in away which is ease for you to use, so when you enable flashing for example, all you do is call the setFlashing(boolean) method and the object takes care of the rest
How do I convert a paintComponent to something that I can manipulate with a layout in a JFrame?
So, I'm running into an issue. I haven't really been taught (and don't have access to a book) how to use layouts/GUI stuff in my courses yet.
My issue is this: I have a program that the user inputs a number. Based on this number, the program calculates a circle and draws it out with a paintComponent method that has a for loop inside of it. The "pixels" that the circle is drawn with are actually fillRect methods. The current method of getting a user-input that I am using is a JOptionPane showInputDialog. This is MOSTLY fine, but I want the user to be able to select from a set of pre-defined numbers. Somebody suggested that I use a JComboBox, but I don't know how I would convert the paintComponent to something that would be usable by a layout manager (which a JComboBox must use, as far as I've learned). I know the dimensions of the paintComponent (805px by 805px) and there is no situation where it will change. If I could get some help with this bit, I am confident that I can figure out using a layout manager myself.
Another way to paint (besides custom painting) is to paint to a BufferedImage. The image can then be displayed in a JLabel.
Examples:
Painting in a BufferedImage inside Swing A fairly complicated one.
Dynamic Graphics Object Painting Another one.
Yet another one.
You don't know the dimensions of paintComponent because it's a method, and methods don't have dimensions. You probably know the dimensions of a JPanel or a JFrame or whatever your component is.
You should separate the panel where you do the painting, and a different panel which would contain any comboboxes or other inputs you decide to put in. That way you can keep your drawing panel as is, and they won't interfere with each other. You'll want to search for the tutorial on LayoutManagers.
I have a maze game in JAVA I'm doing for a class, the maze is made on a canvas in an applet, I wanted to have another picture provided to me (of a statue like thing) act as a game character and be able to be moved around the maze by the arrow keys, so how do I place an object on a canvas that can move around and be controlled, etc.? At the moment, the only way I could get my statue on the maze was by just copying the pixels of the picture onto the maze, so it's just part of the background now...Please help me! I've been posting everywhere looking for help to no avail.
Above the ContentPane you will find that exists a GlassPane. It is the right place to add your statue picture without messing with the background.