GRIB Isobar and Isoline Generation System. More...

#include <iostream>
#include <cmath>
#include <vector>
#include <list>
#include <set>
#include "ocpn_plugin.h"
#include "GribReader.h"

Classes
class	Segment

class	IsoLine

Typedefs
typedef long	outcode

Enumerations
enum	ClipResult { Visible , Invisible }

enum	edge { LEFT , RIGHT , BOTTOM , TOP }

Functions
	WX_DECLARE_LIST (Segment, MySegList)

	WX_DECLARE_LIST (MySegList, MySegListList)

void	CompOutCode (double x, double y, outcode code, struct LOC_cohen_sutherland_line_clip LINK)

Detailed Description

GRIB Isobar and Isoline Generation System.

Implements algorithms for generating and rendering isolines (contours) from GRIB weather data grids. The system specializes in:

Isobar generation for pressure fields
Isotherms for temperature fields
General contour lines for other scalar fields

Key Features:

Efficient line segment generation using grid cell analysis
Contour line simplification and smoothing
Automatic label placement and collision avoidance
Support for both OpenGL and bitmap rendering paths
Line clipping for viewport optimization
High-definition rendering support

The implementation uses the Cohen-Sutherland line clipping algorithm for viewport culling and provides specialized handling for circular quantities like wind direction that wrap around 0-360 degrees.

Definition in file IsoLine.h.

Typedef Documentation

◆ outcode

typedef long outcode

Definition at line 77 of file IsoLine.h.

Enumeration Type Documentation

◆ ClipResult

enum ClipResult

Definition at line 75 of file IsoLine.h.

◆ edge

enum edge

Definition at line 76 of file IsoLine.h.

Function Documentation

◆ CompOutCode()

void CompOutCode	(	double	x,
		double	y,
		outcode *	code,
		struct LOC_cohen_sutherland_line_clip *	LINK
	)

Definition at line 58 of file IsoLine.cpp.

Classes

Typedefs

Enumerations

Functions