graphics

问题 I have search in google. I found something here, http://paulbourke.net/dataformats/bmp/ , but i can't understand the size of header. Reading some webpages i got confused. http://en.wikipedia.org/wiki/JPEG Can anyone give the correct information of header about all these format? 回答1: PNG file contains 8-bytes header. JPEG file (see specification) contains 2-bytes header (SOI) followed by series of markers, some markers can be followed by data array. Each type of marker has different header

问题 For a real-time interactive Mandelbrot viewer I was making in R & Rcpp+OpenMP & Shiny I am on the lookout for a performant way to display 1920x1080 matrices as raster images in the hope of being able to achieve ca. 5-10 fps (calculating the Mandelbrot images themselves now achieves ca. 20-30 fps at moderate zooms, and certainly scrolling around should go fast). Using image() with option useRaster=TRUE , plot.raster or even grid.raster() still doesn't quite cut it, so I am on the lookout for a

问题 I am looking for an algorithm to wrap text within a non-rectangular shape, preferably based on the Knuth and Plass algorithm. The hardest part of this is that the lines may have different heights due to differing font sizes in the text. The image below is an example of what the algorithm should be able to generate. 回答1: Edit, Updated Try text / html gggggggggggggg gggggggggggggg gggggggggggggggggggg gggggggggggggggggg gggggggggggggggggggggggg gggggggggggggggggggggg ggggggggggggggggggggggggggg

问题 I want to add light of the image, I want to use LightingColorFilter LightingColorFilter lcf = new LightingColorFilter( mul, add); imageView.setColorFilter(lcf); but I don't know how to adjust mul, add , can you give some link or code or parameters to adjust the light of the image? Thank you 回答1: The integer values are colours (you may want to have a closer look here http://developer.android.com/reference/android/graphics/Color.html) 4 Bytes are used, one for alpha, one for red, one for green,

问题 I have x1,y1 and x2,y2 which forms a line segment. How can I get another line x3,y3 - x4,y4 which is parallel to the first line as in the picture. I can simply add n to x1 and x2 to get a parallel line but it is not what i wanted. I want the lines to be as parallel in the picture. 回答1: What you want to do is to offset the coordinates in the orthogonal direction. If you know vector math, multiply the vector created by the distance between the endpoints of the line by the following matrix: [ 0

问题 I'm trying to scale and rotate in single operation before creting the final bitmap but the preRotate, postConcat doesn't seem to work. Bitmap bmp = ... original image ... Matrix m = new Matrix() m.setScale(x, y); m.preRotate(degrees, (float) width / 2, (float) height / 2); Bitmap.createBitmap(bmp, 0, 0, bmp.getWidth(), bmp.getHeight(), m, true); It only applies the scale and not rotation. 回答1: This is the code public class Bitmaptest extends Activity { @Override public void onCreate(Bundle

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 3 years ago . Hey I want to draw a graph(Stdent mark distribution) in my site based on PHP. How can I do this? 回答1: pChart is another great PHP graphing library. 回答2: <? # ------- The graph values in the form of associative array $values=array( "Jan" => 110, "Feb" => 130, "Mar" => 215, "Apr" =>

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 4 years ago . I've done a google search of this topic, but so far haven't found anything satisfactory. From your experience, what's the best place to get game resources, like sprites, backgrounds, sound effects, music, etc.? To be more specific, I'm looking for more of sound effects and music, which I'm currently lacking more

问题 I'm trying to write a simple paint applet with Java, but I'm having trouble with BasicStroke . Initially, my plan was to try to somehow draw a line with a width, but the API apparently doesn't support that. I tried using BasicStroke , but the result is just a fuzzy mess. How can I fix this fuzz problem? private void mousedrag_hook(Point point) { if(start == null) start = point; end = point; Graphics2D g2d = (Graphics2D)applInstance.buffer_g; g2d.setStroke(new BasicStroke(7)); //g2d.fillOval

问题 I haven't found a clear explanation on how the Android graphics system works, specifically, does it use a display server, is it based on DirectFB or X11, etc. From what I've managed to piece together, Android depends on the Linux frame buffer. I haven't found much on what sort of display server or window manager Android uses to multiplex access to the framebuffer though, so any pointers would be much appreciated! Finally, from what I understand the ARM instruction set provides instructions to