com.itextpdf.kernel.geom.LineSegment Maven / Gradle / Ivy
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Authors: Bruno Lowagie, Paulo Soares, et al.
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it under the terms of the GNU Affero General Public License version 3
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*/
package com.itextpdf.kernel.geom;
/**
* Represents a line segment in a particular coordinate system. This class is immutable.
*/
public class LineSegment {
/** Start vector of the segment. */
private final Vector startPoint;
/** End vector of the segment. */
private final Vector endPoint;
/**
* Creates a new line segment.
* @param startPoint the start point of a line segment.
* @param endPoint the end point of a line segment.
*/
public LineSegment(Vector startPoint, Vector endPoint) {
this.startPoint = startPoint;
this.endPoint = endPoint;
}
/**
* @return the start point
*/
public Vector getStartPoint() {
return startPoint;
}
/**
* @return the end point
*/
public Vector getEndPoint() {
return endPoint;
}
/**
* @return the length of this line segment
*/
public float getLength(){
return endPoint.subtract(startPoint).length();
}
/**
* Computes the bounding rectangle for this line segment. The rectangle has a rotation 0 degrees
* with respect to the coordinate system that the line system is in. For example, if a line segment
* is 5 unit long and sits at a 37 degree angle from horizontal, the bounding rectangle will have
* origin of the lower left hand end point of the segment, with width = 4 and height = 3.
* @return the bounding rectangle
*/
public Rectangle getBoundingRectangle(){
float x1 = getStartPoint().get(Vector.I1);
float y1 = getStartPoint().get(Vector.I2);
float x2 = getEndPoint().get(Vector.I1);
float y2 = getEndPoint().get(Vector.I2);
return new Rectangle(Math.min(x1, x2), Math.min(y1, y2), Math.abs(x2-x1), Math.abs(y2-y1));
}
/**
* Transforms the segment by the specified matrix
* @param m the matrix for the transformation
* @return the transformed segment
*/
public LineSegment transformBy(Matrix m){
Vector newStart = startPoint.cross(m);
Vector newEnd = endPoint.cross(m);
return new LineSegment(newStart, newEnd);
}
/**
* Checks if a segment contains another segment in itself
* @param other a segment to be checked
* @return true if this segment contains other one, false otherwise
*/
public boolean containsSegment(LineSegment other) {
return other != null && containsPoint(other.startPoint) && containsPoint(other.endPoint);
}
/**
* Checks if a segment contains a given point in itself
* @param point a point to be checked
* @return true if this segment contains given point, false otherwise
*/
public boolean containsPoint(Vector point) {
if (point == null) {
return false;
}
Vector diff1 = point.subtract(startPoint);
if (diff1.get(0) < 0 || diff1.get(1) < 0 || diff1.get(2) < 0) {
return false;
}
Vector diff2 = endPoint.subtract(point);
if (diff2.get(0) < 0 || diff2.get(1) < 0 || diff2.get(2) < 0) {
return false;
}
return true;
}
}