Although Pete’s post is awesomely comprehensive, I’m using this method to draw a very simple line with a little triangle at its end. // create an AffineTransform // and a triangle centered on (0,0) and pointing downward // somewhere outside Swing’s paint loop AffineTransform tx = new AffineTransform(); Line2D.Double line = new Line2D.Double(0,0,100,100); Polygon arrowHead … Read more
Ok, here is a way involving several randomization steps needed to get a “natural” non symmetrical appearance. I am posting the actual code in Mathematica, just in case someone cares translating it to Matlab. (* A preparatory step: get your image and clean it*) i = Import@”http://i.stack.imgur.com/YENhB.png”; i1 = Image@Replace[ImageData[i], {0., 0., 0.} -> {1, … Read more
You can use an AnimationController to control the animation duration. To draw the line “step by step” you can use a Tween (linear interpolation between a beginning and ending value). Then you just need to pass the current progress to your line painter and calculate the new width/height on each paint() when you call canvas.drawLine. … Read more
The simplest way to draw a line onto an image is to use PLOT. %# read and display image img = imread(‘autumn.tif’); figure,imshow(img) %# make sure the image doesn’t disappear if we plot something else hold on %# define points (in matrix coordinates) p1 = [10,100]; p2 = [100,20]; %# plot the points. %# Note … Read more
If you don’t know the number of lines in the image you can use the cv::partition function to split lines on equivalency group. I suggest you the following procedure: Split your lines using cv::partition. You need to specify a good predicate function. It really depends on lines which you extract from image, but I think … Read more
A simple solution using fscanf: void read_ints (const char* file_name) { FILE* file = fopen (file_name, “r”); int i = 0; fscanf (file, “%d”, &i); while (!feof (file)) { printf (“%d “, i); fscanf (file, “%d”, &i); } fclose (file); }
Complementing Deepak Azad’s answer, what you exactly need is the following: Windows: Window → Preferences → Java → Code Style → Formatter → Edit → Line wrapping (tab) Mac OS: ADT → Preferences → Java → Code Style → Formatter → Edit → Line wrapping (tab) Then, in the list at the left, select: Function … Read more
awk ‘NR == FNR {nums[$1]; next} FNR in nums’ numberfile datafile simply referring to an array subscript creates the entry. Looping over the first file, while NR (record number) is equal to FNR (file record number) using the next statement stores all the line numbers in the array. After that when FNR of the second … Read more
Here you are. The interesting methods are getIntersections and getIntersection. The former parses over all polygon segments and checks for intersections, the latter does the actual calculation. Do keep in mind that the calculation can be seriously optimized and doesn’t check for division by 0. This will also work only for polygons. It could be … Read more
The following is a Bresenham-like algorithm that draws 4-connected lines. The code is in Python but I suppose can be understood easily even if you don’t know the language. def line(x0, y0, x1, y1, color): dx = abs(x1 – x0) # distance to travel in X dy = abs(y1 – y0) # distance to travel … Read more