# 2.2.3.5.6 curvebase::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);
ds1.Attach(wksName,colnum);
ds2.Attach(wksName,colnum);
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 );
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.

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);
}
}