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The formula in cell D3 uses the address B3 to refer to Components Sales. The address B3 refers to the position of the cell, not to its meaning. When you copy the formula from cell D3 to cell D4, the address B3 must change to B4. This type of formula is called a relative reference; the formula s operands are relative to the cell s position and each copy of the formula appears slightly different. You can also create formulas that use cell labels. The same worksheet could have formulas that look like these:

This case is added to your switch statement to convert the Enter key into a string that will cause DrawString to take a new line. C# provides other special formatting characters, but for now you ll use only the new-line character. Sample Code: Message Board Program

The new formula in cell D3 uses the label Sales to refer to bike sales. This time, the word Sales refers to the meaning of the cell (as defined by its column label), not to its position. The formula assumes that you want the Sales value for the product category that is on the same row as the formula. When you copy the formula from cell D3 to cell D4, the formula doesn t change. In MDX terminology, the formula implicitly uses the current member of the row axis. Excel formulas that use labels are easy to understand. MDX expressions work in a very similar way. You can create a new calculated measure that automatically refers to the current state, or you can create a new calculated member of the Product dimension that automatically refers to the current measure. By creating a calculated member using MDX, you are in effect entering formulas into a set of cube cells the same way that you copy and paste formulas across a set of cells in an Excel spreadsheet. The power of an MDX calculated member comes from the fact that you don t have to enter the formula into each cell; a single formula automatically propagates to all the necessary cells. This works even when you change the dimensions on the axes. A spreadsheet formula must often refer to a cell that is not on the same row or column as the cell containing the formula. For example, suppose you want to calculate the percent a specific product category contributed to total sales. Using traditional spreadsheet references, you would need to create a formula similar to the following:

The MessageBoard project in the 03 Full Message Display directory in the resources for this chapter contains a program that uses the previously mentioned code to implement a message display with a changing color background, 3D text, and a clock.

If you supply one or more fi le specifications, BASIC compiles the source file(s). If you do not supply a file specification, you enter the BASIC environment and receive the Ready prompt.

8:

Figure 9-6 shows the fully featured message board in action. The clock is always drawn on the line beneath the text.

The formula in cell C3 refers to cell B6. To be able to copy the formula to the other cells in column C, it s necessary to add a dollar sign to anchor the row. This notation technique works, but it s clumsy and difficult to understand, and it would not translate well to the multidimensional world. If you create the formula by using labels, it looks like this:

Figure 9-6

The reference Total Sales refers to cell B6. (The new formula still needs a dollar sign if you want to copy it, but that s not the important part.) When using labels to refer to a cell that is not on the current row or column, you must include both the row and column labels, separated by a space. The result is remarkably readable. MDX, however, cannot simply use member names separated by spaces because an online analytical processing (OLAP) cube typically contains many more than two dimensions. MDX uses a notation and terminology for referring to an explicit cell that can be best understood by seeing how to specify a point on a chart. Imagine a mathematical line. A line has one dimension. In basic charting, if you want to specify a point on the line, you specify a single number or a single coordinate. On the following line, the coordinate for the marked point is 3:

If you separate source file specifications with commas, BASIC compiles each module separately and produces multiple object

You can experiment with the sample code for the Message Board program. You could try using different sizes of text to create different kinds of display.