RegionParams Table

RegionParams Table

The RegionParams table contains properties used by the CMeasureRegions class. This table is used to change properties using the class SetParams method.

The reference table below lists the region measurement properties and their update status. For each property in the top half of the table, there exists a corresponding update status flag in the lower half of the table. The name of the update status flag prefixes the property name with the word Set. For example, the property bCentroid has the update status flag bSetCentroid. Normally, the update status flag is set to false. But to change it using the RegionParams table, you must the the status flag to true. Create an RegionParams table containing only the properties you wish to change. Then call the class SetParams method with the RegionParams table as its parameter.

Table Member	Default	Definition
Property:
sColor	"255,0,0"	The color of the line. See the nRasterOp property.
nRasterOp	13	Controls the way the line color and image color are combined for drawing.
nLineThk	1	Sets the thickness of the line, in pixels, drawn on the image.
bFilled	true	Draws the region filled (true) or outlined (false).
nMatchingTol	3	Sets the tolerance, in pixels, for mouse click "hits" to the line.
nClosureTol	3	Sets the tolerance, in pixels, for clicking on the endpoint of the polygon.
nCentroidRadius	15	The centroid radius when the vertex is adjusted to the centroid coordinates.
nTrackingSearchRadius	15	Specifies the tracking radius when transferring angle marker coordinates to the next image in the image set.
bCentroid	false	Specifies whether each vertex coordinate is updated to centroid coordinates before drawing on the image.
bCentroidPositive	false	Specifies whether the centroid calculation assumes the object has positive (true) or negative (false) values relative to the background.
bCentroidAfterMove	false	Specifies whether each vertex coordinate is updated to centroid coordinates before drawing on the image.
bCentroidTrack	false	Specifies whether the centroid is computed for the vertex when transferring region markers from one image to the next.
bUseDockingPane	false	Specifies whether to list region measurements (area, mean, etc.) in a docking pane (true) instead of a measurement window (false).
Update Status:
bSetColor	false	Enables changes to sColor.
bSetRasterOp	false	Enables changes to nRasterOp.
bSetLineThk	false	Enables changes to nLineThk.
bSetFilled	false	Enabled canges to bFilled.
bSetMatchingTol	false	Enables changes to nMatchingTol.
bSetClosureTol	false	Enables changes to nClosureTol.
bSetCentroidRadius	false	Enables changes to nCentroidRadius.
bSetTrackingSearchRadius	false	Enables changes to nTrackingSearchRadius.
bSetCentroid	false	Enables changes to bCentroid.
bSetCentroidPositive	false	Enables changes to bCentroidPositive.
bSetCentroidAfterMove	false	Enables changes to bCentroidAfterMove.
bSetCentroidTrack	false	Enables changes to bCentroidTrack.
bSetUseDockingPane	false	Enables changes to bUseDockingPane.

Example

Suppose an image window exists on the Mira screen and you have a collection of x,y points that define a polygon to be drawn on the image. The script below sets the drawing color and line thickness before drawing a region on the image.

V = attachlist_imageview()	-- attach an image window
Assert( V, "No image window")	-- leave script if no image window

I = V:GetImage()	-- get the top-most or only image
Assert( I, "No image selected")	-- leave script if no image

R = new_measureregions()	-- create a CMeasureRegions object
Params =	-- setup an RegionParams table
{	-- use a comma after each "name=value" pair
bSetColor = true,	-- enable new marker color
sColor = "0,255,0",
bSetLineThk = true,	-- enable new line thickness
nLineThk = 2,
}
R:SetParams(Params)	-- set the new properties

tbl = {}	-- create a table to hold points
tbl[1] = 400	-- x[1]
tbl[2] = 500	-- y[1]
tbl[3] = 612	-- x[2]
tbl[4] = 480	-- y[2]
-- add more vertex points
R:Add(I, tbl)	-- Add a region marker to the image

Example

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