package gab.opencv;

import processing.core.*;
import org.opencv.core.Mat;

public class Histogram {
	private Mat mat;
	private PApplet parent;
	
	public Histogram(PApplet parent, Mat mat){
		this.mat = mat;
		this.parent = parent;
	}
	
	public void draw(int x, int y, int w, int h) {
		parent.pushMatrix();
		parent.translate(x, y);
		int numBins = mat.height();
		float binWidth = w/(float)numBins;

		for (int i  = 0; i < numBins; i++) {
			float v = (float)mat.get(i, 0)[0];
			parent.rect(i*binWidth, h, binWidth, -h*v);
		}
		parent.popMatrix();
	}
	
	public Mat getMat(){
		return mat;
	}
}