August 2000
Intermediate to advanced
800 pages
13h 15m
English
Content preview from Core PHP Programming: Using PHP to Build Dynamic Web SitesBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Bar Graphs
Bar graphs are a good way to compare values to each other. Creating them is a relatively simple task because each data point is a rectangle. The height of the rectangle represents the value of the data point. To make the transition, a scaling factor is used. In Listing 19.3 the graph is 200 pixels tall and the scaling factor is two. This means that a data point with the value 75 will be 150 pixels tall.
The business of creating the graph is similar to the process described above where a button is created. A blank image is created, several colors are allocated, and functions are called for drawing shapes into the image. The script allows the width of the bars to adapt to the width of the graph. The width of the graph is divided by the ...
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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.