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gvSIG-Desktop 1.11. User manual

by Mario Carrera last modified 2013-07-30 16:04

A point can be referenced in two ways:

  • Console mode. The point coordinates are input numerically.
  • Graphic mode. The point is indicated by using any of the pointer devices (normally a mouse).

The coordinates can also be:

  • Absolute: They define a point based on the coordinate source (0,0).
  • Relative: They define a point based on the last defined point.

Inputting Cartesian coordinates.

Input the X and Y values separated by a comma (X,Y). The X value is the positive or negative distance, in units along the horizontal axis, the Y value is the distance in units along the vertical axis.

insertar-elementos-de-dibujo.img/puntoDesdeConsola_es.png

The values used to designate the points can be whole, decimal, positive or negative.

The absolute coordinate values are based on the source (0,0), which is the place the X and Y axes intersect. For example, the point 25,7 designates a point located 25 units away from the source on the X axis and 7 units away on the Y axis.

The relative values of the coordinates are based on the last input point. Use the relative coordinates when you know the coordinates of a point based on the previous point.

To designate a relative point, place the (@) symbol in front of the coordinates.

For example, the @1,2 coordinates determines a point 1 unit away on the X axis and 2 units away on the Y axis from the previously designated point.

Inserting polar coordinates

To input polar coordinates, indicate a distance and an angle separated by the < symbol. For example, to designate a point 5 units away from the previous one with a 45 degree angle, write @5<45. The angles increase anti-clockwise and decrease clockwise. To move anti-clockwise, indicate a negative angle. For example, the 1<315 position is the same as the 1<-45 position.

insertar-elementos-de-dibujo.img/puntoRelativoDesdeConsola_es.png

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