de.intarsys.pdf.tools.kernel.PDFGeometryTools Maven / Gradle / Ivy
/*
* Copyright (c) 2007, intarsys consulting GmbH
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* - Neither the name of intarsys nor the names of its contributors may be used
* to endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
package de.intarsys.pdf.tools.kernel;
import java.awt.geom.AffineTransform;
import java.awt.geom.Rectangle2D;
import de.intarsys.pdf.cds.CDSMatrix;
import de.intarsys.pdf.cds.CDSRectangle;
import de.intarsys.pdf.pd.PDPage;
/**
* Tool class for calculations regarding the PDF geometry.
*/
public class PDFGeometryTools {
protected static final double RADIANS_MIN_270 = Math.toRadians(-270);
protected static final double RADIANS_MIN_180 = Math.toRadians(-180);
protected static final double RADIANS_MIN_90 = Math.toRadians(-90);
/**
* Given a device space transformation, apply the necessary transformation
* steps to move the origin of the coordinate system to the lower left
* corner of rect after rotating it clockwise by
* rotate.
*
* transform is modified
*
* @param transform
* @param rotate
* @param rect
*/
public static void adjustTransform(AffineTransform transform, int rotate,
Rectangle2D rect) {
if (rotate == 0) {
transform.translate(-rect.getMinX(), -rect.getMinY());
} else if (rotate == 90) {
transform.translate(-rect.getMinY(), rect.getMaxX());
transform.rotate(RADIANS_MIN_90);
} else if (rotate == 180) {
transform.translate(rect.getMaxX(), rect.getMaxY());
transform.rotate(RADIANS_MIN_180);
} else if (rotate == 270) {
transform.translate(rect.getMaxY(), -rect.getMinX());
transform.rotate(RADIANS_MIN_270);
} else {
// this should not happen...
transform.translate(-rect.getMinX(), -rect.getMinY());
}
}
/**
* Given a device space transformation, apply the necessary transformation
* steps to move the origin of the coordinate system to the lower left
* corner of page.
*
* transform is modified
*
* @param transform
* @param page
*/
public static void adjustTransform(AffineTransform transform, PDPage page) {
int rotate = PDFGeometryTools.normalizeRotate(page.getRotate());
Rectangle2D rect = page.getCropBox().toNormalizedRectangle();
adjustTransform(transform, rotate, rect);
}
/**
* Normalize the rotation parameter to a positive multiple of 90 between 0
* and 270.
*
* @param rotation
* @return Normalize the rotation parameter to a positive multiple of 90
* between 0 and 270.
*/
static public int normalizeRotate(int rotation) {
rotation = rotation % 360;
if (rotation > 0) {
return rotation - (rotation % 90);
} else if (rotation == 0) {
return 0;
} else {
rotation = 360 + rotation;
return rotation - (rotation % 90);
}
}
/**
* Create the transformation of rect and return it.
*
* @param matrix
* The transformation to apply.
* @param rect
* The rectangle to be transformed. This is not changed.
* @return The transformed rectangle
*/
public static CDSRectangle transform(CDSMatrix matrix, CDSRectangle rect) {
float[] vec = new float[] { rect.getLowerLeftX(), rect.getLowerLeftY(),
rect.getUpperRightX(), rect.getUpperRightY() };
float[] tVec = matrix.transform(vec);
return new CDSRectangle(tVec);
}
/**
* Tool class cannot be instantiated.
*/
private PDFGeometryTools() {
}
}