package org.hwo.ui.diagram;

public class LinearScaler implements Scaler{

	double 	offset,
			window,
			scale;
	int		height;
	
	
	public LinearScaler() {
		this.height = 1;
		this.offset = 0;
		this.window = 1;
		this.scale();
	}

	private void scale(){
		this.scale = this.height / this.window;
	}
	
	@Override
	public void setHeight(int height) {
		this.height = height;
		this.scale();
	}

	@Override
	public void scale(double minValue, double maxValue, boolean useMargin) {
		this.offset = minValue;
		this.window = maxValue - minValue;
		if (this.window == 0)
		{
			this.window = this.offset * 0.1;
			this.offset -= this.window / 2;
		}
		this.scale();
	}

	@Override
	public int getPosition(double value) {
		return (int)((value - this.offset) * this.scale);
	}

	@Override
	public double getValue(int position) {
		return ((double)position / this.scale) + this.offset;
	}

	@Override
	public double getMinValue() {
		return this.offset;
	}

	@Override
	public double getMaxValue() {
		return this.offset + this.window;
	}

	@Override
	public double getWindow() {
		return this.window;
	}
	
	@Override
	public double[] getMarkerHints() {
		return null;
	}
}