org.jcamp.math.IrregularAxisMap Maven / Gradle / Ivy

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The JCAMP-DX project is the reference implemention of the IUPAC JCAMP-DX spectroscopy data standard.
There is a newer version: 0.9.2
package org.jcamp.math;

/**
 * generic axis mapping. uses an irregular grid.
 * @author Thomas Weber
 */
public class IrregularAxisMap extends AxisMap {
    private IrregularGrid1D preferedGrid;
    /**
     * @param data IInterval1D
     * @param grid IrregularGrid1D
     */
    public IrregularAxisMap(IInterval1D data, IrregularGrid1D grid) {
        super(data);
        preferedGrid = grid;
        Range1D range = grid.getRange1D();
        setFullViewRange(range);
        resetZoom();
    }
    /**
     * calcGrid method comment.
     */
    protected void calcGrid() {
        double zoomMin = realZoomRange.getXMin();
        double zoomMax = realZoomRange.getXMax();
        if (realZoomRange.equals(fullViewRange)) { // use linear grid for zooming in and out
            resetZoom();
        } else {
            if (preferedGrid.isAscending()) {
                double left = Math.floor(preferedGrid.coordinateAt(zoomMin));
                double right = Math.ceil(preferedGrid.coordinateAt(zoomMax));
                int n = (int) (right - left) + 1;
                if (n < 20 && n > 2) {
                    double[] gridArray = new double[n];
                    for (int i = 0; i < n; i++)
                        gridArray[i] = preferedGrid.valueAt((int) left + i);
                    grid = new IrregularGrid1D(gridArray);
                    realZoomRange.set(grid.getRange1D());
                    gridZoomRange.set(grid.coordinateAt(zoomMin), grid.coordinateAt(zoomMax));
                } else {
                    double gridStep = alignTickStep(realZoomRange.getXWidth() / 5);
                    double gridStart = Math.floor((zoomMin) / gridStep) * gridStep;
                    double gridEnd = Math.ceil((zoomMax) / gridStep) * gridStep;
                    grid = new LinearGrid1D(gridStart, gridEnd, gridStep);
                    gridZoomRange.set(grid.coordinateAt(zoomMin), grid.coordinateAt(zoomMax));
                }
            } else {
                double left = Math.floor(preferedGrid.coordinateAt(zoomMax));
                double right = Math.ceil(preferedGrid.coordinateAt(zoomMin));
                int n = (int) (right - left) + 1;
                if (n < 20 && n > 2) {
                    double[] gridArray = new double[n];
                    for (int i = 0; i < n; i++)
                        gridArray[i] = preferedGrid.valueAt((int) left + i);
                    grid = new IrregularGrid1D(gridArray);
                    realZoomRange.set(grid.getRange1D());
                    gridZoomRange.set(grid.coordinateAt(zoomMin), grid.coordinateAt(zoomMax));
                } else {
                    double gridStep = alignTickStep(realZoomRange.getXWidth() / 5);
                    double gridStart = Math.floor((zoomMin) / gridStep) * gridStep;
                    double gridEnd = Math.ceil((zoomMax) / gridStep) * gridStep;
                    grid = new LinearGrid1D(gridEnd, gridStart, -gridStep);
                    gridZoomRange.set(grid.coordinateAt(zoomMin), grid.coordinateAt(zoomMax));
                }
            }
        }
    }
    /**
     */
    public void resetZoom() {
        if (preferedGrid != null) {
            realZoomRange.set(preferedGrid.getRange1D());
            grid = preferedGrid;
            gridZoomRange.set(grid.coordinateAt(realZoomRange.getXMin()), grid.coordinateAt(realZoomRange.getXMax()));
        }
    }
}