#!/bin/rc | |

fn demo {proj=$1; shift; | |

label=$1; shift; | |

{ echo 'o' | |

echo 'ra -8192 -8492 8192 8492' | |

echo 'e' | |

echo 'm -8192 8192' | |

echo t $type | |

echo 'm -8192 -8192' | |

echo t $proj - $label | |

MAP=world MAPDIR=$PLAN9/map map $proj $* -s -d 5 | |

} | |

sleep 5 | |

} | |

rfork en | |

{ | |

type='Equatorial projections centered on long. 0. Parallels are straight lines.' | |

demo mercator 'equally spaced straight meridians, conformal, straight compass courses' | |

demo sinusoidal 'equally spaced parallels, equal-area, same as bonne(0)' | |

demo cylequalarea 'equally spaced straight meridians, equal-area, true scale on Eq' 0 | |

demo cylindrical 'central projection on tangent cylinder' | |

demo rectangular 'equally spaced parallels, equally spaced straight meridians, true scale on Eq' 0 | |

demo gall 'parallels spaced stereographically on prime meridian, equally spaced straight meridians, true scale on Eq' 0 | |

demo mollweide '(homalographic) equal-area, hemisphere is a circle' | |

demo gilbert 'globe mapped conformally on hemisphere, viewed orthographically' | |

type='Azimuthal: centered on the North Pole, Parallels are concentric circles, Meridians are equally spaced radial lines' | |

demo azequidistant 'equally spaced parallels, true distances from pole' | |

demo azequalarea 'equal area' | |

demo gnomonic 'central projecton on tangent plane, straight great circles' | |

demo perspective 'viewed along earth''s axis 2 earth radii from center of earth' 2 | |

demo orthographic 'viewed from infinity' | |

demo stereographic 'conformal, projected from opposite pole' | |

demo laue 'radius = tan(2\(mu colatitude ), used in xray crystallography' | |

demo fisheye 'fisheye view of stereographic map, index of refraction 2' 2 -o 40.75 74 | |

demo newyorker 'New Yorker map from viewing pedestal of radius .5' .5 -o 40.75 74 | |

type='Polar conic projections symmetric about the Prime Meridian. Parallels are segments of concentric circles.' | |

demo conic 'central projection on cone tangent at 40' 40 | |

demo simpleconic 'equally spaced parallels, true scale on 20 and 50' 20 50 | |

demo lambert 'conformal, true scale on 20 and 50' 20 50 | |

demo albers 'equal-area, true scale on 20 and 50' 20 50 | |

demo bonne 'equally spaced parallels, equal-area, parallel 40 developed from tangent cone' 40 | |

type='Projections with bilateral symmetry about the Prime Meridian and the equator.' | |

demo polyconic 'parallels developed from tangent cones, equally spaced along Prime Meridian' | |

demo aitoff 'equal-area projection of globe onto 2-to-1 ellipse, based on azequalarea' | |

demo lagrange 'conformal, maps whole sphere into a circle' | |

demo bicentric 'points plotted at true azimuth from two centers on the equator at longitudes +-40, great circles are straight lines' 40 | |

demo elliptic 'points are plotted at true distance from two centers on the equator at longitudes +-40' 40 | |

demo globular 'hemisphere is circle, circular meridians and parallels' | |

demo vandergrinten 'sphere is circle, meridians as in globular, circular arc parallels resemble mercator' | |

type='Doubly periodic conformal projections.' | |

demo guyou 'W and E hemispheres are square' | |

demo square 'World is square with Poles at diagonally opposite corners' | |

demo tetra 'map on tetrahedron with edge tangent to Prime Meridian at S Pole, unfolded into equilateral triangle' | |

demo hex 'world is hexagon centered on N Pole, N and S hemispheres are equilateral | |

triangles' | |

type='Retroazimuthal projections. Directions to center are true.' | |

demo mecca 'equally spaced vertical meridians' 21.4 -o 90 -39.8 | |

demo homing 'distances to Mecca are true' 21.4 -o 90 -39.8 | |

type='Miscellaneous projections.' | |

demo harrison 'oblique perspective from above the North Pole, 2 earth radii from the earth, looking along the Date Line 40 degrees off vertical' 2 40 | |

demo trapezoidal 'equally spaced parallels, straight meridians equally spaced along parallels, true scale at 20 and 50 on Prime Meridian' 20 50 | |

demo lune 'conformal, polar cap above Eq is 60-degree lune' 0 60 | |

type='Maps based on the spheroid' | |

demo sp_mercator 'equally spaced straight meridians, conformal' | |

demo sp_albers 'equal-area, true scale on 20 and 50' 20 50 | |

} | plot |