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Hello world! Brief introduction to SVG

best to start is with the classic Hello World. Have a program to generate a Hello World is not difficult, just paste the SVG file entries within fprintf and fputs function where you type the file SVG.
is very important to add a backslash (\\) before each quote ("), otherwise, it interprets the end of the chain and will fail the program or you can not compile.

Soon I'll upload the code source to another web page to publish the source code, SVG files and downloads with ease, as this blog fails to copy the source code.
would be something like:

Not much to explain this hello world :

• The encoding (encoding = "ISO-8859-1") is to indicate the character encoding of the SVG file. If you enter bad accents and non-English punctuation appear wrong. The value entered depends on how you save the text file when you type.
• width and height indicate the screen size it will occupy in the SVG file. If its value is 100%, indicating that the SVG file will occupy 100% of screen space or space to indicate the EMBED tag. If no percentage numbers indicate a fixed size that does not change. If the EMBED tag gives the SVG file size smaller than indicated by the figures, this will cut, and if greater, it will have a blank area unoccupied.
  
• Viewbox however, indicates the portion of the SVG image is cut and fit in the box indicated by width and height.
• label text indicates the text . The simplest way to use it is entering the text directly from the label to open and close. Its properties indicate the font, color, position ... allows anchor text-align text (left to end, right and center to start in middle) on the point indicated by the coordinates x, and (in this case 60 for the two values).
  

The previous source code works fine but does nothing special that can not be done with Notepad or any text editor (VI, Gedit ...) or Inkscape. Replacing some functions printf and by changing some numerical values \u200b\u200bfor variables, you can get a program that generates an SVG file of given size, with the phrase Hello world! focused on the SVG file.

The program now uses two variables to determine the width and height of the SVG image. It also places the text in the center by using the parameter text-anchor = "start" on the label text and locate the point where text is aligned right in the center of the image. Changing the height and width values, the SVG file that comes out will be bigger or smaller. Plus now the source text is a bit larger than before.
What could be out of this program?

• can create something similar in PHP. In my case I used C for their ease of understanding in simple examples, but with PHP you could do a similar program.
• width and height variables receive the value in the collection, but a program "well done" would take the values \u200b\u200bof these variables of parameters passed to the program, text file input, database. .. each case is different.
  
• Used % .1 f in printf because the screen does not need a higher precision to one decimal place. If nothing is placed, printf would 6 decimal places, which increase the size of the file. In this example with few uses this detail does not matter much, but in a 500 point polyline if this affects more detail.
• To put the text to use floating point numbers ( % .1 f), while the size of the SVG image whole numbers (i %). This is because the size of the image must be an integer, but then, when placing the elements within it, you can use floating point numbers.
  
• is written (float ) front of each float number calculation. This is because if not done, the value is calculated first as integer and then converted to float (ie, the division would no decimals). However if it becomes the number before the float, the calculation is done as floating, and thus allows the results of operations may lead decimals, making the position of the text is more accurate than if calculated without decimals.

Source:

• http://vanus01.net/web/generando-imagenes-svg/2/