Draw great circle arcs in the fast preview. More...

#include <GreatCircles.h>

Public Member Functions
	GreatCircles ()
	constructor More...

void	setVisualizationState (VisualizationState *visualizationState)
	Set the ViewState to use for information on output projection and preview display. More...

void	drawLineFromSpherical (double startLat, double startLong, double endLat, double endLong, double width=1.0)
	Draw the shortest segment of the great circle crossing two spherical coordinates. More...

Private Attributes
VisualizationState *	m_visualizationState

Detailed Description

Draw great circle arcs in the fast preview.

A great circle is the spherical equivalent of a straight line, but is often drawn curved, depending on the start and end positions and the projection.

Definition at line 35 of file GreatCircles.h.

Constructor & Destructor Documentation

GreatCircles::GreatCircles ( )

constructor

Definition at line 53 of file GreatCircles.cpp.

Member Function Documentation

void GreatCircles::drawLineFromSpherical	(	double	startLat,
		double	startLong,
		double	endLat,
		double	endLong,
		double	width = `1.0`
	)

Draw the shortest segment of the great circle crossing two spherical coordinates.

Actually, the line is approximated since OpenGL doesn't do curves.

Preconditions: The OpenGL state must be ready to draw lines the required width and colour, and outside of a glBegin/glEnd pair. setViewStatePtr must have been called with a valid (and still valid9 ViewState pointer to the ViewState used by the preview.

Parameters

startLat	lattiude of the first point in degrees.
startLong	longitude of the first point in degrees.
endLat	lattide of the second point in degrees.
endLong	longitude of the second point in degrees.
width	width of the line in pixels.