28029 Parallax Inc, 28029 Datasheet - Page 187

• Manufacturer Part Number: 28029
• Description: KIT PARTS SMART SENSORS W/TEXT
• Manufacturer: Parallax Inc

Specifications of 28029

• Accessory Type: Parts Kit
• Product: Microcontroller Accessories
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: BASIC Stamp® or Javelin Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
• Other names: 28029PAR

You can use a standard algebra technique, solving two equations in two unknowns, to
figure out the statements you will need to transform Cartesian coordinates into display
coordinates for the Debug Terminal. This next example shows how it was done for the
statements that converted x and y from Cartesian to display coordinates in
PlotXYGraph.bs2.
By adding a couple of
and after versions of the X-value you entered.
√
√
√
√
√
Save PlotXyGraph.bs2 under another name, like PlotXyGraphBeforeAfter.bs2.
Add the two
Add two more
Enter the coordinates (3,1) and (-2,-2) into the Debug Terminal's Transmit
windowpane. See Figure 5-5.
Record the After values in Table 5-1.
DEBUG "Type X coordinate: "
DEBUGIN SDEC1 x
DEBUG CR, "Type Y coordinate: "
DEBUGIN SDEC1 y
DEBUG CRSRXY, 0, 12, "x before: ", SDEC x
x = (x * 2) + 6
y = 3 - y
DEBUG CRSRXY, 0, 14, "x after:
DEBUG CRSRXY, x, y, "*"
DEBUG
DEBUG
DEBUG
Coordinates
(-2, -2)
Table 5-1:
(3, 1)
commands that display the "before" and "after" values of x.
commands to PlotXYGraph.bs2, you can display the before
commands to display the “before” and “after” values of y.
X Values Before and After
Before
-2
3
Chapter 5: Accelerometer Gaming Basics · Page 175
", SDEC x
After
' <--- Add
' <--- Add