Comments on: Example 6-8: Lines One at a Time http://www.learningprocessing.com A Beginner's Guide to Programming Images, Animation, and Interaction by Daniel Shiffman Thu, 09 Feb 2012 16:27:00 +0000 hourly 1 By: subpixel http://www.learningprocessing.com/examples/chapter-6/example-6-8/comment-page-1/#comment-624 subpixel Thu, 22 Jan 2009 08:17:59 +0000 http://www.learningprocessing.com/?page_id=387#comment-624 A visible line is drawn when y==0 (the first row of pixels of the display), and an invisible, or "offscreen" line is drawn when y==height (==200). Not a big deal in this case, but it is helpful to keep in mind that the display pixel coordinates are from 0 to width - 1 in the x direction and 0 to height - 1 in the y direction, and is absolutely critical if using the pixels[] array method to plot points, since specifying an out of bounds index will throw a Java exception. A visible line is drawn when y==0 (the first row of pixels of the display), and an invisible, or “offscreen” line is drawn when y==height (==200).

Not a big deal in this case, but it is helpful to keep in mind that the display pixel coordinates are from 0 to width – 1 in the x direction and 0 to height – 1 in the y direction, and is absolutely critical if using the pixels[] array method to plot points, since specifying an out of bounds index will throw a Java exception.

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