# Difference between revisions of "Formula plotting-drawings"

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Drawings are useful in a variety of mathematical contexts. For example, they are useful in geometry or solving various word problems. They are indispensable in physics. | Drawings are useful in a variety of mathematical contexts. For example, they are useful in geometry or solving various word problems. They are indispensable in physics. | ||

## Revision as of 15:07, 30 June 2005

Drawings are useful in a variety of mathematical contexts. For example, they are useful in geometry or solving various word problems. They are indispensable in physics.

Conceptually, a drawing as it could be done on this site is a picture with defined dimensions, virtual coordinate system, and one or more elements placed on the virtual coordinates.

Drawings are defined as a drawing() function:

drawing( 300, 300, 0, 10, 0, 10, red( circle( 5, 5, 3 ) ), locate( 5, 5, X ) )

The arguments to drawing() are:

- x and y dimensions in pixels
- xmin, xmax, ymin and ymax coordinates of the virtual coordinate system. Point (xmin, ymin) is the left lower corner, and point (xmax, ymax) is the right upper corner.
- one or (usually) several graphical elements.

The following elements are defined now:

- line( x1, y1, x2, y2 ) -- draws a line
- circle( x1, y1, r ) -- draws a circle

You can also place elements such as Sprite (picture), as well as regular math formulae onto the coordinate system. The two functions for doing so are:

- locate( x, y, expression ) -- locates the left upper corner of expression in point x, y
- locate_center( x, y, expression ) - locates center of the expression in point x, y.