paint

This question already has an answer here: Difference between paint() and paintcomponent()? 2 answers Can anyone explain me why shouldn't i use paint method to draw directly inside a JFrame window, and i should use paintComponent method with a JPanel inside the JFrame ? Thanks in advance. MadProgrammer Three main reasons... Top level containers aren't double buffered, which cause flickering when the frame is repainted, yes, you can implement you're own double buffering, but... Painting inside a frame does not take into consideration the frames borders, meaning that it's possible to paint under

For the last two days I have tried to understand how Java handles graphics, but have failed miserably at just that. My main problem is understanding exactly how and when paint() (or the newer paintComponent() ) is/should be called. In the following code I made to see when things are created, the paintComponent() is never called, unless I manually add a call to it myself or calls to JFrame.paintAll()/JFrame.paintComponents(). I renamed the paint() method to paintComponent() in hoping that would fix my problem of it never being called (even at repaint()), but no luck. package jpanelpaint; import

I've spent maybe the last two hours browsing and reading up on these methods and the Graphics class, and maybe I'm stupid, haha, but I'm just not understanding them. What are they for? I understand that they're supposed redraw or update components on the screen, but I have never understood why this is required (I'm new to this). For example, if I'm moving a JLabel around the screen, a call to setLocation() moves it just fine. Is that a scenario in which repaint() isn't required? In which scenarios is it useful, and why? Apologies if you feel that this is a question that could be solved using

So I use Paint's measureText() method to measure the width of a segment of text, but I wanted to measure text based on a certain text size. Say I wanted to get the width of a text segment that will be 20 scaled pixels when it occupies a certain TextView. I tried the following: Paint paint = new Paint(); paint.setTextSize(20); paint.measureText("sample text"); However, it does not seem to be working. I believe it is returning a width with respect to a smaller text size. I feel like I'm missing something that will make me slap myself in the face and yell herp derp. You need to get the

I would like to include a color picker in my paint program. So anyone here has already done something like this please give me some tutorials or piece of code to get me started. I really need to get the whole idea of adding this. I already have set up the canvas for the drawing so I'd like to add the color picker to it. Any ideas are welcome. Thanks. Your class should implement ColorPickerDialog.OnColorChangedListener public class MainActivity implements ColorPickerDialog.OnColorChangedListener { private Paint mPaint; mPaint = new Paint(); // on button click new ColorPickerDialog(this, this,

The game I'm trying to create is snake and so far I've figured out how to use paint(Graphics g) a bit of JPanel , mouse listener and now I'm trying to create a rectangle that will move across the screen and use key bindings or key listener, but I have no idea how I should go about this. Here's my code so far, it has 2 parts. The first part is called snake2 because if I don't know what I'm doing I make the same program with different things. Snake used frame, but Snake2 uses JPanel (looks better…) import java.awt.*; //required for MouseListener import java.awt.event.*; //requied for Graohics