Example usage for java.awt.geom Rectangle2D outcode

Introduction

In this page you can find the example usage for java.awt.geom Rectangle2D outcode.

Prototype

public abstract int outcode(double x, double y);

Source Link

Document

Determines where the specified coordinates lie with respect to this Rectangle2D .

Usage

From source file:LineUtilities.java

/**
 * Clips the specified line to the given rectangle.
 *
 * @param line  the line (<code>null</code> not permitted).
 * @param rect  the clipping rectangle (<code>null</code> not permitted).
 *
 * @return <code>true</code> if the clipped line is visible, and
 *     <code>false</code> otherwise.
 *//*from  w  w  w . jav a  2  s .  c o m*/
public static boolean clipLine(Line2D line, Rectangle2D rect) {

    double x1 = line.getX1();
    double y1 = line.getY1();
    double x2 = line.getX2();
    double y2 = line.getY2();

    double minX = rect.getMinX();
    double maxX = rect.getMaxX();
    double minY = rect.getMinY();
    double maxY = rect.getMaxY();

    int f1 = rect.outcode(x1, y1);
    int f2 = rect.outcode(x2, y2);

    while ((f1 | f2) != 0) {
        if ((f1 & f2) != 0) {
            return false;
        }
        double dx = (x2 - x1);
        double dy = (y2 - y1);
        // update (x1, y1), (x2, y2) and f1 and f2 using intersections
        // then recheck
        if (f1 != 0) {
            // first point is outside, so we update it against one of the
            // four sides then continue
            if ((f1 & Rectangle2D.OUT_LEFT) == Rectangle2D.OUT_LEFT && dx != 0.0) {
                y1 = y1 + (minX - x1) * dy / dx;
                x1 = minX;
            } else if ((f1 & Rectangle2D.OUT_RIGHT) == Rectangle2D.OUT_RIGHT && dx != 0.0) {
                y1 = y1 + (maxX - x1) * dy / dx;
                x1 = maxX;
            } else if ((f1 & Rectangle2D.OUT_BOTTOM) == Rectangle2D.OUT_BOTTOM && dy != 0.0) {
                x1 = x1 + (maxY - y1) * dx / dy;
                y1 = maxY;
            } else if ((f1 & Rectangle2D.OUT_TOP) == Rectangle2D.OUT_TOP && dy != 0.0) {
                x1 = x1 + (minY - y1) * dx / dy;
                y1 = minY;
            }
            f1 = rect.outcode(x1, y1);
        } else if (f2 != 0) {
            // second point is outside, so we update it against one of the
            // four sides then continue
            if ((f2 & Rectangle2D.OUT_LEFT) == Rectangle2D.OUT_LEFT && dx != 0.0) {
                y2 = y2 + (minX - x2) * dy / dx;
                x2 = minX;
            } else if ((f2 & Rectangle2D.OUT_RIGHT) == Rectangle2D.OUT_RIGHT && dx != 0.0) {
                y2 = y2 + (maxX - x2) * dy / dx;
                x2 = maxX;
            } else if ((f2 & Rectangle2D.OUT_BOTTOM) == Rectangle2D.OUT_BOTTOM && dy != 0.0) {
                x2 = x2 + (maxY - y2) * dx / dy;
                y2 = maxY;
            } else if ((f2 & Rectangle2D.OUT_TOP) == Rectangle2D.OUT_TOP && dy != 0.0) {
                x2 = x2 + (minY - y2) * dx / dy;
                y2 = minY;
            }
            f2 = rect.outcode(x2, y2);
        }
    }

    line.setLine(x1, y1, x2, y2);
    return true; // the line is visible - if it wasn't, we'd have
                 // returned false from within the while loop above

}

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