As a general rule, PNG is never worse, and often better than GIF because of superior compression. There might be some edge cases where GIF is slightly better (because the PNG format may have a slightly larger overhead from metadata) but it’s really not worth the worry. It may just be the tools I’m using, … Read more
The best explanation is that the RGB color model is somewhat unintuitive for us humans. It’s perfectly logical for a video display device (such as a monitor or television) that only knows how to display colors by mixing varying amounts of 3 pre-defined colors: red, green, and blue. But that’s not how you and I … Read more
I remember reading (a long time ago) a short description of an algorithm to do so: for the general form of the line, you split the segment in two at a random point, and move this point slightly away from it’s position (the variation depending on the distance of the point to the extremity). Repeat … Read more
The original poster wanted to DETECT an intersection between a line segment and a polygon. There was no need to LOCATE the intersection, if there is one. If that’s how you meant it, you can do less work than Liang-Barsky or Cohen-Sutherland: Let the segment endpoints be p1=(x1 y1) and p2=(x2 y2). Let the rectangle’s … Read more
Instead of picking individual libraries, I’ll have a go at a quick overview at all of them, as listed in the Graphics section on Hackage. Basic frameworks: OpenGL Part of the Haskell Platform Used for many small 2 and 3D games. Examples: lambdacube-engine, roguestar-gl, hpong, monadius, raincat, frag GTK cabal install cairo Used for high … Read more
When you create the figure you set the Visibile property to Off. f = figure(‘visible’,’off’) Which in your case would be im = imread(‘image.tif’); f = figure(‘visible’,’off’), imshow(im, ‘Border’, ‘tight’); rectangle(‘Position’, [100, 100, 10, 10]); print(f, ‘-r80’, ‘-dtiff’, ‘image2.tif’); And if you want to view it again you can do set(f,’visible’,’on’)
convert works much better than montage. It arranges images vertically or horizontally and keeps png transparency. convert *.png -append sprites.png (append vertically) convert *.png +append sprites.png (append horizontally)
PlantUML. http://plantuml.sourceforge.net/sequence.html PlantUML is used to draw UML diagram, using a simple and human readable text description. The generated images can then be used without any reference to the GPL/LGPL/ASL/EPL/MIT license. It is not even necessary to stipulate that they have been generated with PlantUML, although this will be appreciate by PlantUML team. In my … Read more
I’ve written some quick-and-dirty code that estimates this for Bézier curves of any degree. (Note: this is pseudo-brute force, not a closed-form solution.) Demo: http://phrogz.net/svg/closest-point-on-bezier.html /** Find the ~closest point on a Bézier curve to a point you supply. * out : A vector to modify to be the point on the curve * curve … Read more
The lowest level would be the graphics card’s video RAM. When the computer first starts, the graphics card is typically set to the 80×25 character legacy mode. You can write text with a BIOS provided interrupt at this point. You can also change the foreground and background color from a palette of 16 distinctive colors. … Read more