node-opencv/src/Contours.cc

#include "Contours.h"
#include "OpenCV.h"
#include <nan.h>

#include <iostream>

v8::Persistent<FunctionTemplate> Contour::constructor;


void
Contour::Init(Handle<Object> target) {
	NanScope();

	//Class/contructor
	
	Local<FunctionTemplate> ctor = NanNew<FunctionTemplate>(Contour::New);
  NanAssignPersistent(constructor, ctor);
  ctor->InstanceTemplate()->SetInternalFieldCount(1);
  ctor->SetClassName(NanNew("Contours"));
	

	// Prototype
	//Local<ObjectTemplate> proto = constructor->PrototypeTemplate();


	NODE_SET_PROTOTYPE_METHOD(ctor, "point", Point);
	NODE_SET_PROTOTYPE_METHOD(ctor, "size", Size);
	NODE_SET_PROTOTYPE_METHOD(ctor, "cornerCount", CornerCount);
	NODE_SET_PROTOTYPE_METHOD(ctor, "area", Area);
	NODE_SET_PROTOTYPE_METHOD(ctor, "arcLength", ArcLength);
	NODE_SET_PROTOTYPE_METHOD(ctor, "approxPolyDP", ApproxPolyDP);
	NODE_SET_PROTOTYPE_METHOD(ctor, "convexHull", ConvexHull);
	NODE_SET_PROTOTYPE_METHOD(ctor, "boundingRect", BoundingRect);
	NODE_SET_PROTOTYPE_METHOD(ctor, "minAreaRect", MinAreaRect);
	NODE_SET_PROTOTYPE_METHOD(ctor, "isConvex", IsConvex);
	NODE_SET_PROTOTYPE_METHOD(ctor, "moments", Moments);
	
	target->Set(NanNew("Contours"), ctor->GetFunction());
};


NAN_METHOD(Contour::New) {
  NanScope();

	if (args.This()->InternalFieldCount() == 0)
    NanThrowTypeError("Cannot instantiate without new");

	Contour *contours;
	contours = new Contour;

	contours->Wrap(args.Holder());
	NanReturnValue(args.Holder());
}


Contour::Contour(): ObjectWrap() {
}

NAN_METHOD(Contour::Point) {
	 NanScope();

		Contour *self = ObjectWrap::Unwrap<Contour>(args.This());
		int pos   = args[0]->NumberValue();
		int index = args[1]->NumberValue();

		cv::Point point = self->contours[pos][index];

		Local<Object> data = NanNew<Object>();
		data->Set(NanNew("x"), NanNew<Number>(point.x));
		data->Set(NanNew("y"), NanNew<Number>(point.y));

		NanReturnValue(data);
}


// FIXME: this sould better be called "Length" as ``Contours`` is an Array like structure
// also, this would allow to use ``Size`` for the function returning the number of corners
// in the contour for better consistency with OpenCV.
NAN_METHOD(Contour::Size) {
	 NanScope();

	Contour *self = ObjectWrap::Unwrap<Contour>(args.This());

	NanReturnValue(NanNew<Number>(self->contours.size()));
}


NAN_METHOD(Contour::CornerCount) {
	 NanScope();

	Contour *self = ObjectWrap::Unwrap<Contour>(args.This());
	int pos = args[0]->NumberValue();

	NanReturnValue(NanNew<Number>(self->contours[pos].size()));
}


NAN_METHOD(Contour::Area) {
	 NanScope();

	Contour *self = ObjectWrap::Unwrap<Contour>(args.This());
	int pos = args[0]->NumberValue();

	//NanReturnValue(NanNew<Number>(contourArea(self->contours)));
	NanReturnValue(NanNew<Number>(contourArea(cv::Mat(self->contours[pos]))));
}


NAN_METHOD(Contour::ArcLength) {
	 NanScope();

	Contour *self = ObjectWrap::Unwrap<Contour>(args.This());
	int pos = args[0]->NumberValue();
	bool isClosed = args[1]->BooleanValue();

	NanReturnValue(NanNew<Number>(arcLength(cv::Mat(self->contours[pos]), isClosed)));
}


NAN_METHOD(Contour::ApproxPolyDP) {
	 NanScope();

	Contour *self = ObjectWrap::Unwrap<Contour>(args.This());
	int pos = args[0]->NumberValue();
	double epsilon = args[1]->NumberValue();
	bool isClosed = args[2]->BooleanValue();

	cv::Mat approxed;
	approxPolyDP(cv::Mat(self->contours[pos]), approxed, epsilon, isClosed);
	approxed.copyTo(self->contours[pos]);

	NanReturnNull();
}


NAN_METHOD(Contour::ConvexHull) {
	 NanScope();

	Contour *self = ObjectWrap::Unwrap<Contour>(args.This());

	int pos        = args[0]->NumberValue();
	bool clockwise = args[1]->BooleanValue();

	cv::Mat hull;
	cv::convexHull(cv::Mat(self->contours[pos]), hull, clockwise);
	hull.copyTo(self->contours[pos]);

	NanReturnNull();
}


NAN_METHOD(Contour::BoundingRect) {
	 NanScope();

	Contour *self = ObjectWrap::Unwrap<Contour>(args.This());
	int pos = args[0]->NumberValue();

	cv::Rect bounding =	cv::boundingRect(cv::Mat(self->contours[pos]));
	Local<Object> rect = NanNew<Object>();

	rect->Set(NanNew("x"), NanNew<Number>(bounding.x));
	rect->Set(NanNew("y"), NanNew<Number>(bounding.y));
	rect->Set(NanNew("width"), NanNew<Number>(bounding.width));
	rect->Set(NanNew("height"), NanNew<Number>(bounding.height));

	NanReturnValue(rect);
}


NAN_METHOD(Contour::MinAreaRect) {
	 NanScope();

	Contour *self = ObjectWrap::Unwrap<Contour>(args.This());
	int pos = args[0]->NumberValue();

	cv::RotatedRect minimum = cv::minAreaRect(cv::Mat(self->contours[pos]));

	Local<Object> rect = NanNew<Object>();
	rect->Set(NanNew("angle"), NanNew<Number>(minimum.angle));

	Local<Object> size = NanNew<Object>();
	size->Set(NanNew("height"), NanNew<Number>(minimum.size.height));
	size->Set(NanNew("width"), NanNew<Number>(minimum.size.width));
	rect->Set(NanNew("size"), size);

	Local<Object> center = NanNew<Object>();
	center->Set(NanNew("x"), NanNew<Number>(minimum.center.x));
	center->Set(NanNew("y"), NanNew<Number>(minimum.center.y));

	v8::Local<v8::Array> points = NanNew<Array>(4);

	cv::Point2f rect_points[4];
	minimum.points(rect_points);

	for (unsigned int i=0; i<4; i++){
		Local<Object> point = NanNew<Object>();
		point->Set(NanNew("x"), NanNew<Number>(rect_points[i].x));
		point->Set(NanNew("y"), NanNew<Number>(rect_points[i].y));
		points->Set(i, point);
	}

	rect->Set(NanNew("points"), points);

	NanReturnValue(rect);
}


NAN_METHOD(Contour::IsConvex) {
	 NanScope();

	Contour *self = ObjectWrap::Unwrap<Contour>(args.This());
	int pos = args[0]->NumberValue();

	NanReturnValue(NanNew<Boolean>(isContourConvex(cv::Mat(self->contours[pos]))));
}

NAN_METHOD(Contour::Moments) {
	 NanScope();

	Contour *self = ObjectWrap::Unwrap<Contour>(args.This());
	int pos = args[0]->NumberValue();

	/// Get the moments
	cv::Moments mu = moments( self->contours[pos], false );
    
	Local<Object> res = NanNew<Object>();

	res->Set(NanNew("m00"), NanNew<Number>(mu.m00));
	res->Set(NanNew("m10"), NanNew<Number>(mu.m10));
	res->Set(NanNew("m01"), NanNew<Number>(mu.m01));
	res->Set(NanNew("m11"), NanNew<Number>(mu.m11));

	NanReturnValue(res);
}