US Census Graphs
This example graphs the decenial census of the United States.
The graph at level zero is drawn as a single solid shape with the Graph extension. The other graphs are drawn with the GraphMulti and GraphMultiLine extensions. All of these extensions are built into the qviewer and can be used to build other timelines.
- Use of a rectangle, other than a square, as the shape of the category.
- The built-in Graph extension.
- The built-in GraphMulti and GraphMultiLine extensions.
- Use of the manual level of detail to change the data shown on the graph and the appearance of the graphs.
- Click the mouse on the display time box at the top of the window and edit
the time value to be "1900". Hit the enter (return) key to set the new value.
- Move the viewpoint (using the square target) until the tall box is
just to the left of the center of the window.
- Change the view direction to the right .
- Decrease the time scale (triangle target down) until both ends of
the graph are visible (about 0.003)
- When the level of detail is zero the graph is a solid object.
The top surface represents the US population.
- Change the level of detail to one. The two lines graph the rural
and urban populations. The values are added, so the top (urban) line
is always the same as the total US population.
- Note that the values at the display time are shown in labels at
the center of the window. These change as you move the display time
(move the circle target up and down.) The values in the labels show
the amount from the preceeding census and are the same over ten
- Change the level of detail to two. Again the two lines graph the
rural and urban populations. The values are not added, This makes it
easy to see when (around 1917) the urban population exceeded the rural
- Change the level of detail to three. The four lines graph the
population in four areas of the country. The values are added.
- Change the level of detail to four. Again the four lines graph
the population in four areas of the country. The values are not
- You can change the x/y scale and x/y location to zoom in and zoom
out of parts of the graph. This can be useful when graph lines are
- level 0: shows a solid shape representing the entire population.
- level 1: graphs the rural and urban populations. The values are added so they occupy the entire original population shape.
- level 2: graphs the rural and urban populations with out adding them.
- level 3: graphs the population by region (NE - New England, S - South, NC - North Central, and W- West). The values are added.
- level 4: The population by region. The values are not added.
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