LineParams Table

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

The reference table below lists the line 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 LineParams table, you must the the status flag to true. Create a LineParams table containing only the properties you wish to change. Then call the class SetParams method with the LineParams 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. The default draws a solid line of color sColor.
nLineThk	1	Sets the thickness of the line, in pixels, drawn on the image.
nMatchingTol	3	Sets the tolerance, in pixels, for mouse click "hits" to the line.
nCentroidRadius	15	The centroid radius when the vertex is adjusted to the centroid coordinates.
nTrackingSearchRadius	15	Specifies the tracking radius when transferring line marker coordinates to the next image in the image set.
bCentroid	false	Specifies whether the 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.
bCentroidEndpt	false	Specifies whether the end-point coordinates are updated to centroid coordinates before drawing on the image.
bCentroidAfterMove	false	Specifies whether the 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 line markers from one image to the next.
bCentroidTrackEndpt	false	Specifies whether the centroid is computed for transferring line markers from one image to the next.
bUseDockingPane	false	Specifies whether to list line measurements (distance, baseline angle, 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.
bSetMatchingTol	false	Enables changes to nMatchingTol.
bSetCentroidRadius	false	Enables changes to nCentroidRadius.
bSetTrackingSearchRadius	false	Enables changes to nTrackingSearchRadius.
bSetCentroid	false	Enables changes to bCentroid.
bSetCentroidPositive	false	Enables changes to bCentroidPositive.
bSetCentroidEndpt	false	Enables changes to bCentroidEndpt.
bSetCentroidAfterMove	false	Enables changes to bCentroidAfterMove.
bSetCentroidTrack	false	Enables changes to bCentroidTrack.
bSetCentroidTrackEndpt	false	Enables changes to bCentroidTrackEndpt.
bSetUseDockingPane	false	Enables changes to bUseDockingPane.

Example

Suppose an image window exists on the Mira screen and you have a collection of approximate coordinates of objects for which you wish to compute the distance and baseline angle between several pairs of points. You wish to improve the approximate coordinates by computing the center at each vertex and at each endpoint. The script below enables centroid computation at both the vertex and each endpoint, and sets the drawing color and line thickness for drawing the lines.

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

L = new_measurelines()	-- create a CMeasureLines object
Params =	-- setup an LineParams table
{	-- use a comma after each "name=value" pair
bSetCentroid = true,	-- enable centroid for first point
bCentroid = true,
bSetCentroidEndpt = true,	-- enable centroid for endpoint
bCentroidEndpt = true,
bSetColor = true,	-- enable new marker color
sColor = "0,255,0",
bSetLineThk = true,	-- enable new line thickness
nLineThk = 2,
}
L:SetParams(Params)	-- set the new properties

x1 = 300; y1 = 7500	-- first point coordinates
x2 = 250; y2 = 600	-- endpoint coordinates
A:Add(I, x1, y1, x2, y2)	-- Add an line marker to the image

Example

Related Topics