Log Viewer

The log viewer is a program that is designed to view and print data that has been acquired from an oil well. The best way to describe this program is as a "virtual strip chart recorder." Some of the technical challenges involved with this project are:

	Because many of the plotters used in the oil industry are rack mounted with the paper coming out of the front, the printouts tend to come out up-side-down. The log viewer has the capabilty of printing up-side-down or right-side-up.
	Generation of contour maps from other curves such as the cement map illustrated in the screen shot.
	Support for multiple data formats.
	The ability to wrap over and under range data.
	The ability to fill the space between two curves, a curve and either of its scales or a curve and an absolute position.
	Data tips: when the mouse arrow hovers over a curve point, the curve's name, value and units are displayed in a tiny pop-up window.
	Tool tips: when the mouse arrow hovers over values on the status bar or tool bar, a description of the item is displayed in a tiny pop-up window.
	The ability to change the presentation at various depth zones.
	Dragging and dropping curves on the presentation.
	User ability to annotate the chart.
	Automatic conversion between metric and english presentations.
	Presentation of depth or time based data.
	Import/Export presentation data
	Conversion between data formats.

There are two primary objects that make up the log viewer: the track and the scale. The scale view is the upper half of the presentation and the track view is the lower half of the presentation. Each of these objects contain the same draw routine to render the image on the display, the printer, a print preview and into an image file.

A custom mapping mode is used to do all output in 1000ths of an inch, similar to MM_HIENGLISH but with increasing positive values going down instead of up (like an oil well).

The links on the left represent a screen shot of a typical presentation and its corresponding print preview using an HP laser jet 4 print driver.