November 2004
Intermediate to advanced
1024 pages
27h 50m
English
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Coordinate Transformations
Suppose you need to draw an object such as an automobile. You know, from the manufacturer's specifications, the height, wheelbase, and total length. You could, of course, figure out all pixel positions, assuming some number of pixels per meter. However, there is an easier way: You can ask the graphics context to carry out the conversion for you.
g2.scale(pixelsPerMeter, pixelsPerMeter);g2.draw(new Line2D.Double(coordinates in meters)); // converts to pixels and draws scaled line
The scale method of the Graphics2D class sets the coordinate transformation of the graphics context to a scaling transformation. That transformation changes user coordinates (user-specified units) to device coordinates (pixels). Figure 7-18 ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.