Find the 3D extent of a polyline. - Java java.lang

Java examples for java.lang:Math Geometry Line

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Description

Find the 3D extent of a polyline.

Demo Code


//package com.java2s;

public class Main {
    /**//w  ww  .j  a  v  a  2  s.c o m
     * Find the 3D extent of a polyline.
     *
     * @param x X coordinates of polyline.
     * @param y Y coordinates of polyline.
     * @param z Z coordinates of polyline. May be null if this is a 2D case.
     * @param xExtent Will upon return contain [xMin,xMax].
     * @param yExtent Will upon return contain [xMin,xMax].
     * @param zExtent Will upon return contain [xMin,xMax]. Unused (may be set
     * to null) if z is null.
     */
    public static void findPolygonExtent(double[] x, double[] y,
            double[] z, double[] xExtent, double[] yExtent, double[] zExtent) {
        double xMin = +Double.MAX_VALUE;
        double xMax = -Double.MAX_VALUE;

        double yMin = +Double.MAX_VALUE;
        double yMax = -Double.MAX_VALUE;

        double zMin = +Double.MAX_VALUE;
        double zMax = -Double.MAX_VALUE;

        for (int i = 0; i < x.length; i++) {
            if (x[i] < xMin) {
                xMin = x[i];
            }
            if (x[i] > xMax) {
                xMax = x[i];
            }

            if (y[i] < yMin) {
                yMin = y[i];
            }
            if (y[i] > yMax) {
                yMax = y[i];
            }

            if (z != null) {
                if (z[i] < zMin) {
                    zMin = z[i];
                }
                if (z[i] > zMax) {
                    zMax = z[i];
                }
            }
        }

        xExtent[0] = xMin;
        xExtent[1] = xMax;

        yExtent[0] = yMin;
        yExtent[1] = yMax;

        if (z != null) {
            zExtent[0] = zMin;
            zExtent[1] = zMax;
        }
    }

    /**
     * Find the extent of a polygon.
     *
     * @param x X coordinates of polygon.
     * @param y Y coordinates of polygon.
     * @param xExtent Will upon return contain [xMin, xMax]
     * @param yExtent Will upon return contain [yMin, yMax]
     */
    public static void findPolygonExtent(int[] x, int[] y, int[] xExtent, // xMin, xMax
            int[] yExtent) // yMin, yMax
    {
        int xMin = +Integer.MAX_VALUE;
        int xMax = -Integer.MAX_VALUE;

        int yMin = +Integer.MAX_VALUE;
        int yMax = -Integer.MAX_VALUE;

        for (int i = 0; i < x.length; i++) {
            if (x[i] < xMin) {
                xMin = x[i];
            }
            if (x[i] > xMax) {
                xMax = x[i];
            }

            if (y[i] < yMin) {
                yMin = y[i];
            }
            if (y[i] > yMax) {
                yMax = y[i];
            }
        }

        xExtent[0] = xMin;
        xExtent[1] = xMax;

        yExtent[0] = yMin;
        yExtent[1] = yMax;
    }
}

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