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-
- Aitoff: This item generates a polyconic projection of the
- entire Earth's surface. It features equidistant spacing of
- parallels, and was first described in 1889. The center of the
- view will be at the currently-selected center point.
-
- Boundaries: These six toggle switches indicate which items are
- to be included in the maps, namely: coastlines, country
- boundaries, U.S. state boundaries, islands, lakes and rivers.
- A checkmark by an item indicates that the item is to be
- included.
-
- Boundary Colors: These items allow the user to select the
- color in which each boundary item will be drawn. Each boundary
- item (e.g., coastlines, lakes, etc.) may be drawn in a
- different color.
-
- Box: This item generates a "flat" map of any portion of the
- Earth's surface that lies inside a user-selectable rectangular
- region on a flat or Mercator map. If a flat map is not
- currently being displayed, then a flat map is first displayed.
- The user selects the rectangular region by first pressing the
- left mouse button to select one vertex of the rectangle,
- dragging the mouse to define the box, then releasing the left
- mouse button when the desired area has been selected. The user
- may also cancel this entire selection by pressing the right
- mouse button before initially pressing the left mouse button.
- Note that, if the selection is canceled, then the center point
- for subsequent selections will be at 0 degrees latitude and 0
- degrees longitude unless the user selects another center point.
-
- Box Zoom In: This item may only be used after the user has
- previously selected either the Box, Box Zoom In or Box Zoom Out
- items. This item allows the user to select a rectangular box
- within the currently-displayed box for closer inspection,
- thereby further expanding the view of that smaller box. The
- smaller box is selected as described in the Help entry for the
- Box item. The user may cancel this selection by pressing the
- right mouse button before initially pressing the left mouse
- button.
-
- Box Zoom Out: This item may only be used after the user has
- previously selected either the Box, Box Zoom In, or Box Zoom
- Out items. Selecting this item causes the limits (both
- latitude and longitude) of the currently-displayed box to be
- increased by a factor of 2, and all regions within that larger
- box are then displayed.
-
- Clear Screen: This item causes the entire screen to be cleared
- to the default background color (blue).
-
- Detail Level: This item indicates how much detail the maps are
- to include (e.g., high, low, etc.). The more detail, the more
- time required to draw the maps.
-
- Display Center: This item displays in the title bar the
- current values for the latitude and longitude of the center
- of the map.
-
- Draw Line: This item allows the user to draw a connected line
- by first pressing and holding down the left mouse button, and
- then moving the mouse while continuing to hold down the left
- mouse button. Releasing the left mouse button terminates the
- line drawing function. The user may cancel this selection by
- first pressing the right mouse button before pressing the left
- mouse button.
-
- Flat: This item generates a simple, "flat" map of the entire
- Earth's surface. This map features equidistant spacing of
- parallels. Also known as a cylindrical equidistant projection,
- it is attributed to Anaximander, c. 550 B.C. The center of the
- view will be at the currently-selected center point.
-
- Flood Color: This item allows the user to select the color to
- be used in color-filling regions. The color is selected by
- releasing the right mouse button over the desired color. The
- currently-selected color is indicated by a check mark.
-
- Flood Fill: This item causes a contiguous area to be color
- filled. Pressing the left mouse button results in the area
- underneath the mouse being color-filled with the color selected
- for color-filling (see the Help entry for the Flood Color item).
- The color of all contiguous points of the same color as the
- point under the mouse is changed to the flood-fill color. The
- user may cancel this item by pressing the right mouse button.
-
- Gall: This item generates Gall's stereographic cylindrical
- projection of the entire Earth's surface. This projection was
- first described in 1855. The center of the view will be at the
- currently-selected center point.
-
- Globe: This item generates a plot of an entire hemisphere of
- the Earth's surface, i.e., that part of the globe that would be
- visible if seen from infinitely far away, but with a very
- powerful telescope. The center of the view will be at the
- currently-specified center point. This is more commonly called
- an orthographic projection, and is attributed to Apollonius,
- c. 240 B.C.
-
- Grid: This item generates grid lines on the type of map
- currently being displayed. The only maps on which grid lines
- may not be drawn are the box, box-zoom-in, and box-zoom-out
- maps.
-
- Hammer-Aitoff: This item generates a Hammer-Aitoff projection
- of the entire Earth's surface. It is an equal-area, polyconic
- projection with decreasing separation of parallels. It was
- first described in 1892. The center of the view will be at the
- currently-selected center point.
-
- Help: Selecting this item results in a window appearing, with
- a gadget labelled for each menu item. Pressing the left mouse
- button on a particular gadget results in a display of the Help
- entry for that particular menu item. Pressing the left mouse
- button on the OK gadget terminates the display of the Help
- entry for that menu item. Pressing the left mouse button on
- the Exit Help gadget terminates the Help function.
-
- Lambert: This item generates a Lambert cylindrical equal-area
- projection of the entire Earth's surface. This projection was
- first described in 1772. The center of the view will be at the
- currently-selected center point.
-
- Line Color: This item allows the user to select the color to
- be used for drawing lines. The color is selected by releasing
- the right mouse button over the desired color. The
- currently-selected color is indicated by a check mark.
-
- Mercator: This item generates a standard Mercator projection
- of the entire Earth's surface. This projection was used by
- Mercator in 1569, and described by Wright in 1599. The center
- of the view will be at the currently-selected center point.
-
- Mollweide: This item generates a pseudo-cylindrical,
- equal-area projection of the entire Earth's surface. It is
- attributed to Mollweide, was first described in 1805, and
- features decreasing separation of parallels. The center of the
- view will be at the currently-selected center point.
-
- New Center: This item allows the user to select a point to be
- the center of subsequent maps. If the map currently displayed
- is not a flat map, then a flat map is blittered onto the screen.
- A grid is displayed, and the user may either select a new
- center point by pressing the mouse select button over the
- desired point or cancel the item by pressing the right mouse
- button.
-
- Orbital: This item generates a plot of the Earth's surface as
- seen from a user-selectable altitude. The center of the view
- will be at the currently-specified center point. A requester
- is presented which prompts the user to enter an altitude from
- which to view. Note that the entire visible portion of the
- Earth's surface is plotted, no attempt being made to clip the
- visible portion to a user's hypothetical window as seen from an
- orbiting spacecraft. This results in a sort of "fish-eye"
- effect, but it does show the entire portion of the globe
- visible from that altitude.
-
- Palette: This item gives the user full control over the entire
- palette. A window is opened showing the current palette,
- slider bars and RGB values which can be directly modified.
- Any or all colors may be modified, the resulting color changes
- being immediately reflected on the screen.
-
- Print Map: This item causes the currently-displayed map to be
- printed on the printer specified in the user's standard Amiga
- Preferences file.
-
- Quit: This item causes the program to clean up after itself
- and terminate.
-
- Recenter: This item causes the center point of subsequent maps
- to be at 0 degrees latitude and 0 degrees longitude.
-
- Redraw: This item causes the last map drawn to be redrawn.
- This is useful, for example, when one changes the detail level
- and wants to see the same map drawn at the new detail level.
-
- Reset Colors: This item causes the default palette (and NOT
- the user's personal palette in the "drawmap.config" file) to be
- loaded. The colors on the displayed screen are immediately
- modified.
-
- Sanson-Flamsteed: This item generates a pseudo-cylindrical,
- equal-area projection of the entire Earth's surface. It is
- attributed to Sanson and Flamsteed, was first described in
- 1606, and features equidistant separation of parallels. The
- center of the view will be at the currently-selected center
- point.
-
- Save Config: This item causes the user's palette to be saved
- into a file named "drawmap.config". When the program is next
- executed, it looks for this file and, if found, loads the
- palette contained therein.
-
- Save Map: This item allows the user to save to disk the
- currently-displayed map. A file requester is first displayed
- as a prompt to the user to select a file name, after which the
- map is saved as a standard IFF file. It may then be displayed
- by any well-behaved IFF display program or loaded into any
- normal paint program.
-
- Shadow: This item causes drop-shadows to be generated on the
- currently-displayed map. The only colors for which shadows are
- not generated are "black" and the background "blue".
-
- Simple Polyconic: This item generates a simple polyconic
- projection of the entire Earth's surface. It features
- equidistant spacing of parallels, and was first described in
- 1855. The center of the view will be at the currently-selected
- center point.
-
- Slide: This item allows the user to select a point on the
- equator to be the center of subsequent maps. If the map
- currently displayed is not a flat map, then a flat map is
- blittered onto the screen. A grid is displayed, and the user
- may either select a new center point by pressing the mouse
- select button over the desired point or cancel the item by
- pressing the right mouse button. The selected center point is
- then constrained to lie on the equator by forcing the latitude
- to zero.
-
- Text: This item allows the user to enter text and place it
- anywhere on the screen. A text requester is displayed, into
- which any desired text may be entered. Pressing the "return"
- or "enter" key terminates the requester, and a box (of size
- equal to the size of the specified text) is displayed at the
- mouse position. The user then positions the text by moving the
- mouse. Pressing the left mouse button stamps down the
- specified text onto the currently-displayed map. Pressing the
- right mouse button cancels the selection (i.e., no text will be
- stamped down).
-
- Text Color: This item allows the user to select the color to
- be used for user-specified text. The color is selected by
- releasing the right mouse button over the desired color. The
- currently-selected color is indicated by a check mark.
-
- Toggle Title: This item causes the screen title bar to be
- alternately turned on or off.
-
- Zoom In: This item generates an Orbital view as seen from
- one-half the previous orbital altitude. The center of the view
- will be at the currently-selected center point. If no previous
- Orbital view had been generated, then the altitude is one-half
- the initial, default altitude of 300 kilometers. The user may
- cancel this item by pressing the right mouse button.
-
- Zoom Out: This item generates an Orbital view as seen from
- twice the previous orbital altitude. The center of the view
- will be at the currently-selected center point. If no previous
- Orbital view had been generated, then the altitude is twice the
- initial, default altitude of 300 kilometers. The user may
- cancel this item by pressing the right mouse button.
-
- Exit Help: This selection terminates the Help function.
-
-