/// <summary>
/// Return the steps it takes to go from the current value to value*ratio.
/// </summary>
/// <param name="ratio">Ratio that needs to be converted to steps. Can be smaller than one</param>
/// <returns>the number of steps. Will be negative when ratio smaller than 1</returns>
public int StepsNeededForRatio(double ratio)
{
DiscreteScale newScale = new DiscreteScale();
newScale.ApproximateTo(ratio * ScaleValue);
int neededSteps = newScale.stepIndex - this.stepIndex;
neededSteps += discreteSteps.Count() * (newScale.powerOfTen - this.powerOfTen);
return(neededSteps);
}
/// <summary>
/// constructor
/// </summary>
/// <param name="drawScaleRuler">The Scale ruler that needs to be updated on screen and zoom sizes</param>
public DrawArea(DrawScaleRuler drawScaleRuler)
{
AreaW = 1230;
AreaH = 700;
metersPerPixel = new DiscreteScale();
MouseLocation = new WorldLocation(0, 0, 0, 0, 0); // default mouse location far far away
fontManager = FontManager.Instance;
SetDrawArea(-1, 1, -1, 1); // just have a default
this.drawScaleRuler = drawScaleRuler;
}