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Triangle Plot Options

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Controls the appearance of a triangle plot.

Shortcut:

Right-click within an existing triangle plot and select Triangle Plot Options.

Clockwise Orientation

Reverses the normal counterclockwise orientation of the numbers on the axes. Using this option the Y components will be mapped to the scale on the left, Z to the right.

X+Y+Z=1

By default DPlot forces X+Y+Z=100. Check this box if the range on each of the 3 components is 0-1.0.

USDA Soil Classification

If this option is checked, a triangle plot will be divided into the 12 soil texture classes defined by the US Department of Agriculture. The scaling assumes that the datas X components (bottom scale) are sand percentage (0-100, or 0-1 if X+Y+Z=1 is checked) and Y components (right side of triangle) are clay percentage. The left side of the triangle is then silt percentage, forced to 100-(X+Y), or to 1.0-(X+Y) if X+Y+Z=1 is checked. If your data is instead X=sand and Y=silt percentages, to properly use this option you would first need to perform the transform Y=<range>-(X+Y) using the Operate on Y command on the Edit menu, where <range>=1.0 if X+Y+Z=1 is checked, and 100 otherwise.

IUGS Mafic Rock Classification

Draws boundaries and labels for IUGS (International Union of Geological Sciences) mafic rock. X axis is Olivine percentage, Y axis is Plagioclase percentage, and the inferred Z axis is Clinopyroxene percentage.

IUGS Ultramafic Rock Classification

Draws boundaries and labels for IUGS (International Union of Geological Sciences) ultramafic rock classifications. X axis is Clinopyroxene percentage, Y axis is Olivine percentage, and the inferred Z axis is Othopyroxene percentage.

Ab-An-Or Mineral Classification

Draws boundaries and labels for Albite-Anorthite-Orthoclase classification. X values are assumed to be Orthoclase percentage, Y values are assumed to be Anorthite percentage, and the inferred Z values are Albite percentage.

Note: Most moderate-sized non-bold fonts will have a pronounced aliasing problem at orientations other than horizontal or vertical on your display. They're ugly, in other words. For triangle plots this pertains to the numbers along the X and Z axes. The equivalent bold font will generally have a better appearance in this case. This applies mainly to the display and saved bitmaps; printed fonts will generally look good regardless of the orientation or font weight.

 

Related macro commands

TriangleFlags

 

 


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