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/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package edu.wpi.first.wpijavacv;
import static com.googlecode.javacv.cpp.opencv_imgproc.*;
import static com.googlecode.javacv.cpp.opencv_core.*;
/**
* A class that represents a polygon, can be obtained from approxPolygon()
* in WpiContour
* @author Greg Granito
*/
public class WPIPolygon extends WPIDisposable {
CvSeq polygon;
CvRect boundingRect;
WPIPolygon(CvSeq data) {
polygon = data;
}
CvSeq getCVSeq() {
return polygon;
}
/**
*
* @return an array of WpiPoints of the vertices of the polygon
*/
public WPIPoint[] getPoints() {
CvPoint points = new CvPoint(getNumVertices());
WPIPoint[] wpiPoints= new WPIPoint[getNumVertices()];
cvCvtSeqToArray(polygon, points.position(0), CV_WHOLE_SEQ);
for (int j = 0; j < getNumVertices(); j++) {
wpiPoints[j] = new WPIPoint(points.position(j).x(), points.position(j).y());
}
return wpiPoints;
}
/**
*
* @return the width of the bounding rectangle of the polygon
*/
public int getWidth() {
if (boundingRect == null) {
boundingRect = cvBoundingRect(polygon, 0);
}
return boundingRect.width();
}
/**
*
* @return the height of the bounding rectangle of the polygon
*/
public int getHeight() {
if (boundingRect == null) {
boundingRect = cvBoundingRect(polygon, 0);
}
return boundingRect.height();
}
/**
*
* @return the x coord of the top left corner of the bounding
* rectangle of the polygon
*/
public int getX() {
if (boundingRect == null) {
boundingRect = cvBoundingRect(polygon, 0);
}
return boundingRect.x();
}
/**
*
* @return the y coord of the top left corner of the bounding
* rectangle of the polygon
*/
public int getY() {
if (boundingRect == null) {
boundingRect = cvBoundingRect(polygon, 0);
}
return boundingRect.y();
}
/**
*
* @return the number of vertices in the polygon
*/
public int getNumVertices() {
return polygon.total();
}
/**
*
* @return whether or not the polygon is convex
*/
public boolean isConvex() {
return cvCheckContourConvexity(polygon) == 0 ? false : true;
}
/**
*
* @return the area in pixels of the polygon
*/
public int getArea() {
return Math.abs((int) cvContourArea(polygon, CV_WHOLE_SEQ, -1));
}
/**
*
* @return the perimeter in pixels of the polygon
*/
public int getPerimeter() {
return (int) cvArcLength(polygon, CV_WHOLE_SEQ, -1);
}
public void disposed() {
polygon.deallocate();
}
}
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