Computing: Free Pascal Programming

Circle geometry.

Download Circles desktop application (Windows 64bit)

Download Circles source code (Lazarus/Free Pascal)

Description: Analytical geometry application, concerning circles. The application allows four types of calculations:

• Determination of the tangent at a given point.
• Intersection of the circle with a given line.
• Intersection of the circle with another circle.
• Determination of the circle's outer and inner squares.

The circle may be defined either by its center's coordinates and its radius R, or by the coordinates of two of its points A and B, with length of [AB] = R. The usage of the application seems evident for me, thus, I didn't include any help text. For details concerning the equation of circles, tangents and the intersection of a circle with a line or another circle, please have a look at a math book or search the Internet.

Possible extensions: Outer and inner squares with sides, that aren't parallel to Ox and Oy. Determination of other outer and inner shapes, such as, for example, triangles.

Free Pascal features: Re-arranging form controls during runtime. Showing/hiding controls as needed. Drawing mathematical objects, using bitmap canvas. Scaling canvas drawings. Usage of trackbars.

Screenshots:

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