graphics

问题 I attempted to replicate this component (at the bottom of the post), but I can't seem to get it to look nice. So I'm wondering, how do I replicate this gradient paint? Or if it isn't the gradient paint, what do I do to get similar results? My attempt turned out very flat black compared to this component. Also it had the JFrame options (close, minimize, etc) and it didn't have a 'rounded' look to the components. I'm looking for someone who can improve what I have and explain where I went wrong

问题 I upgraded my system and reinstalled R, and now my standard X-11 plots are not anti-aliased -- they look jagged and the font looks bad. I seem to recall a problem like this in the past but don't remember what I did about it. Some other info: qplot also comes out non-anti-aliased plotting to a png device produces non-anti-aliased output as well plotting to a pdf device, however, produces nice looking anti-aliased output Another thing: I've been running this version of R/Ubuntu for a while now,

问题 Given the following code: import javax.swing.*; import java.awt.*; public class NewClass extends JPanel { public void paintComponent(Graphics g) { g.drawLine(0, 0, 90, 90); } public static void main(String[] args) { JFrame jf = new JFrame(); jf.add(new NewClass()); jf.setSize(500, 500); jf.setVisible(true); } } Why does it draw a line if the method drawLine is abstract and, as I managed to understand, an abstract method has no definition? Thank you in advance! 回答1: paintComponent() gets a non

问题 I have a pygame Surface and would like to invert the colors. Is there any way quicker & more pythonic than this? It's rather slow. I'm aware that subtracting the value from 255 isn't the only definition of an "inverted color," but it's what I want for now. I'm surprised that pygame doesn't have something like this built in! Thanks for your help! import pygame def invertImg(img): """Inverts the colors of a pygame Screen""" img.lock() for x in range(img.get_width()): for y in range(img.get

问题 I have been using some nice tutorials on drawing graphics on my android. I wanted to also add in the cool gesture demo found here: http://developer.android.com/resources/articles/gestures.html That takes these lines of code: GestureOverlayView gestures = (GestureOverlayView) findViewById(R.id.gestures); gestures.addOnGesturePerformedListener(this); This is fine and dandy yet I realize in my demo i'm trying to build using code from "Playing with Graphics in Android". The demos make sense,

问题 I have been using some nice tutorials on drawing graphics on my android. I wanted to also add in the cool gesture demo found here: http://developer.android.com/resources/articles/gestures.html That takes these lines of code: GestureOverlayView gestures = (GestureOverlayView) findViewById(R.id.gestures); gestures.addOnGesturePerformedListener(this); This is fine and dandy yet I realize in my demo i'm trying to build using code from "Playing with Graphics in Android". The demos make sense,

问题 I have been using some nice tutorials on drawing graphics on my android. I wanted to also add in the cool gesture demo found here: http://developer.android.com/resources/articles/gestures.html That takes these lines of code: GestureOverlayView gestures = (GestureOverlayView) findViewById(R.id.gestures); gestures.addOnGesturePerformedListener(this); This is fine and dandy yet I realize in my demo i'm trying to build using code from "Playing with Graphics in Android". The demos make sense,

问题 I have been using some nice tutorials on drawing graphics on my android. I wanted to also add in the cool gesture demo found here: http://developer.android.com/resources/articles/gestures.html That takes these lines of code: GestureOverlayView gestures = (GestureOverlayView) findViewById(R.id.gestures); gestures.addOnGesturePerformedListener(this); This is fine and dandy yet I realize in my demo i'm trying to build using code from "Playing with Graphics in Android". The demos make sense,

问题 Since drawing fonts is quite expensive in terms of CPU, many developers use a rasterized font to draw text on video games; that's what I did too. Using additive blending when drawing the text works fine regarding glyph edges, these merge nicely with the background color. But it brought another issue, I decided to implement a 'color' parameter for drawing the font, instead of producing glyphs bitmaps for each color, otherwise memory usage might be an issue soon; depending how many glyphs and

问题 I have a heightmap which is just a 16-bit wide big-endian array. I haven't looked into encoding a jpg or png from the raw data, but before I do I would like to know if there are any programs that I can download to view it as an image, because I want to know what it looks like. When I do a search for viewing raw image data all the results return information about RAW image formats as used for camera image formats, which also differ between manufacturers, I don't think that's what I'm looking