3
我经历了很多turotials和cuover的问题在stackoverflow中,我发现下面的方法用于绘制矩形。如何编辑此方法以使用javacv绘制多边形?
public static void drawSquares(IplImage image, final CvSeq squares)
{
if(!squares.isNull()){
CvSeq p = new CvSeq(squares.total());
cvCvtSeqToArray(squares, p, CV_WHOLE_SEQ);
System.out.println(squares.total());
for(int i = 0; i < squares.total(); i ++ )
{
CvPoint pts = new CvPoint(4);
cvCvtSeqToArray(p.position(i), pts, CV_WHOLE_SEQ);
// //cvBoundingRect(image, i);
int npt[] = {4, 4};
// //DrawLine() reference http://opencv.willowgarage.com/documentation/cpp/drawing_functions.html#cv-line
cvDrawLine(image, new CvPoint(pts.position(0).x(),pts.position(0).y()), new CvPoint(pts.position(1).x(),pts.position(1).y()), CvScalar.GREEN, 3, CV_AA, 0);
cvDrawLine(image, new CvPoint(pts.position(1).x(),pts.position(1).y()), new CvPoint(pts.position(2).x(),pts.position(2).y()), CvScalar.GREEN, 3, CV_AA, 0);
cvDrawLine(image, new CvPoint(pts.position(2).x(),pts.position(2).y()), new CvPoint(pts.position(3).x(),pts.position(3).y()), CvScalar.GREEN, 3, CV_AA, 0);
cvDrawLine(image, new CvPoint(pts.position(3).x(),pts.position(3).y()), new CvPoint(pts.position(0).x(),pts.position(0).y()), CvScalar.GREEN, 3, CV_AA, 0);
}
}
final CanvasFrame canvas = new CanvasFrame(wndname);
canvas.setDefaultCloseOperation(javax.swing.JFrame.EXIT_ON_CLOSE);
canvas.showImage(image);
}
这段代码正好在绘制矩形的时候。但是我需要修改这个方法来绘制有8边的多边形。我试图改变代码如下,但它没有给我所期望的。
public static void drawPoly(IplImage image, final CvSeq poly)
{
if(!poly.isNull()){
CvSeq p = new CvSeq(poly.total());
cvCvtSeqToArray(poly, p, CV_WHOLE_SEQ);
System.out.println(poly.total());
for(int i = 0; i < poly.total(); i ++ )
{
System.out.println(i);
CvPoint pts = new CvPoint(8);
cvCvtSeqToArray(p.position(i), pts, CV_WHOLE_SEQ);
cvDrawLine(image, new CvPoint(pts.position(0).x(),pts.position(0).y()), new CvPoint(pts.position(1).x(),pts.position(1).y()), CvScalar.GREEN, 3, CV_AA, 0);
cvDrawLine(image, new CvPoint(pts.position(1).x(),pts.position(1).y()), new CvPoint(pts.position(2).x(),pts.position(2).y()), CvScalar.GREEN, 3, CV_AA, 0);
cvDrawLine(image, new CvPoint(pts.position(2).x(),pts.position(2).y()), new CvPoint(pts.position(3).x(),pts.position(3).y()), CvScalar.GREEN, 3, CV_AA, 0);
cvDrawLine(image, new CvPoint(pts.position(3).x(),pts.position(3).y()), new CvPoint(pts.position(4).x(),pts.position(4).y()), CvScalar.GREEN, 3, CV_AA, 0);
cvDrawLine(image, new CvPoint(pts.position(4).x(),pts.position(4).y()), new CvPoint(pts.position(5).x(),pts.position(5).y()), CvScalar.GREEN, 3, CV_AA, 0);
cvDrawLine(image, new CvPoint(pts.position(5).x(),pts.position(5).y()), new CvPoint(pts.position(6).x(),pts.position(6).y()), CvScalar.GREEN, 3, CV_AA, 0);
cvDrawLine(image, new CvPoint(pts.position(6).x(),pts.position(6).y()), new CvPoint(pts.position(7).x(),pts.position(7).y()), CvScalar.GREEN, 3, CV_AA, 0);
cvDrawLine(image, new CvPoint(pts.position(7).x(),pts.position(7).y()), new CvPoint(pts.position(0).x(),pts.position(0).y()), CvScalar.GREEN, 3, CV_AA, 0);
}
}
final CanvasFrame canvas = new CanvasFrame("Test inside last");
canvas.setDefaultCloseOperation(javax.swing.JFrame.EXIT_ON_CLOSE);
canvas.showImage(image);
}
这个结果如下错误信息,但我不明白的原因比。
0
#
# A fatal error has been detected by the Java Runtime Environment:
#
# EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x5c995048, pid=5992, tid=4464
#
# JRE version: 6.0_16-b01
# Java VM: Java HotSpot(TM) Client VM (14.2-b01 mixed mode, sharing windows-x86)
# Problematic frame:
# C [opencv_core240.dll+0x55048]
#
# An error report file with more information is saved as:
# C:\Users\Space\Documents\NetBeansProjects\1MyJavacv\hs_err_pid5992.log
#
# If you would like to submit a bug report, please visit:
# http://java.sun.com/webapps/bugreport/crash.jsp
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
#
Java Result: 1
可以请一些解释一个为什么它不跑的,什么是错误的与我methid?
你可以发布一个[SSCCE](http://www.sscce.org/)来重现你的问题吗?否则“hs_err_pid5992.log”的内容可能也会有所帮助 – Attila 2012-07-17 13:13:09
您是否得到了drawSquares方法?你还可以在你找到它的地方提供stackoverflow链接吗? – nikhil 2012-07-18 08:05:36
它在错误信息中说,这个异常是在Java虚拟机之外抛出的*。这是Java绕过C代码抛出的某种异常。 – 2012-07-19 01:56:35