2.2.3.5.6 curvebase::GetRectPoints

GetRectPoints

Description

Find all the points in a Curve which fall on or within a specified rectangle.

Syntax

int GetRectPoints( fpoint & fptTopLeft, fpoint & fptBottomRight, vector<double> & vX, vector<double> & vY, vector<int> & vIndex )

Parameters

fptTopLeft

[Input] fpoint identifying the top-left corner of the rectangle

fptBottomRight

[Input] fpoint identifying the bottom-right corner of the rectangle

vX

[Output] vector containing the X coordinates of all points in the rectangele, paired with vY and vIndex

vY

[Output] vector containing the Y coordinates of all points in the rectangele, paired with vX and vIndex

vIndex

[Output] vector containing the row index (0 based) into the Curve's X and Y data sets, paired with vX and vY

Return

Returns the number of data points found within the rectangle (0,1,2,3...) on success and returns a negative integer on failure. Also returns the coordinates and index of all points within the rectangle.

Examples

EX1

int curvebase_GetRectPoints_ex1(string wksName = "Book1")
{
	// Assumes Book1_A(X) and Book1_B(Y) exist with the following data:
	// Book1_B={1,2,3,4,5,6,7,8,9,10}
	// Book1_A={1,2,3,4,5,6,7,8,9,10};
    Worksheet wks(wksName);
    Dataset ds1(wksName,0), ds2(wksName,1), ds3;
    
    Curve crv(ds1, ds2);
    int colnum = wks.AddCol("Index");
    ds1.Attach(wksName,colnum);
    colnum = wks.AddCol("Xval");
    ds2.Attach(wksName,colnum);
    colnum = wks.AddCol("Yval");
    ds3.Attach(wksName,colnum);
    
    fpoint fptTL(3,8);
    fpoint fptBR(7,2);
    vector<double> vX, vY;
    vector<int> vIndex; 
    int num = crv.GetRectPoints( fptTL, fptBR, vX, vY, vIndex );
    vIndex+=1;  //adjust because 0 based
    ds1 = vIndex;
    ds2 = vX;
    ds3 = vY;
    return num;
}

Remark

Find all the points in a Curve which fall on or within a specified rectangle. The rectangle is specified by its top-left and bottom-right corners.

See Also

There is a similar method in DataPlot class that is more useful as it is not possible to get curvebase from a data plot. The following example shows how to count number of data points given a rectangle region of the graph layer:

void dd(double x1, double x2, double y1, double y2)
{
	fpoint fptTL(x1,y2);
	fpoint fptBR(x2,y1);
	vector vX, vY;
	GraphLayer gl = Project.ActiveLayer();       
	int ii = 1;
	foreach (DataPlot dp in gl.DataPlots)
	{
		int	nn = dp.GetRectPoints(fptTL, fptBR, vX, vY);
		printf("%d: Found %d\n", ii++, nn);
	}
}

Header to Include

origin.h