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Scalar Vector Graphics
Of course, as the geometry and image gets more complex, so does the mathematical model required to describe it.
Fortunately, the creation of these mathematical models can be automated through the use of some graphics programmes, to avoid having to solve mathematical equations by hand.
Some currently available commercial and open source graphics programmes save graphics in the SVG format, as defined by the W3C organisation, and can be read by the SVG plug-ins (at present, not Browsers read and interpret SVG graphics without plug-ins), and in fact, many existing graphics programmes actually create graphics in using vector technology, which is then converted to raster format to be read by existing graphics browsers.
SVG Graphics can further be written, by hand, with no knowledge of the underpinning mathematics involved.
The SVG terminology, saves us from having to be aware that the equation for a line is y = ax + b, and simplifies its implementation to something like
<line x1="127" y1="65" x2="127" y2="200">
As you have probably gleaned by now, the creation of SVG Graphics does not necessarily require a programme any more complex than NotePad or any simple text edit, although a graphics programme could assist in the creation of more complex images, more quickly.