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Diffstat (limited to 'bundles/org.eclipse.swt/Eclipse SWT/cairo/org/eclipse/swt/graphics/Transform.java')
| -rw-r--r-- | bundles/org.eclipse.swt/Eclipse SWT/cairo/org/eclipse/swt/graphics/Transform.java | 387 |
1 files changed, 0 insertions, 387 deletions
diff --git a/bundles/org.eclipse.swt/Eclipse SWT/cairo/org/eclipse/swt/graphics/Transform.java b/bundles/org.eclipse.swt/Eclipse SWT/cairo/org/eclipse/swt/graphics/Transform.java deleted file mode 100644 index b755f16571..0000000000 --- a/bundles/org.eclipse.swt/Eclipse SWT/cairo/org/eclipse/swt/graphics/Transform.java +++ /dev/null @@ -1,387 +0,0 @@ -/******************************************************************************* - * Copyright (c) 2000, 2008 IBM Corporation and others. - * All rights reserved. This program and the accompanying materials - * are made available under the terms of the Eclipse Public License v1.0 - * which accompanies this distribution, and is available at - * http://www.eclipse.org/legal/epl-v10.html - * - * Contributors: - * IBM Corporation - initial API and implementation - *******************************************************************************/ -package org.eclipse.swt.graphics; - -import org.eclipse.swt.*; -import org.eclipse.swt.internal.*; -import org.eclipse.swt.internal.cairo.*; - -/** - * Instances of this class represent transformation matrices for - * points expressed as (x, y) pairs of floating point numbers. - * <p> - * Application code must explicitly invoke the <code>Transform.dispose()</code> - * method to release the operating system resources managed by each instance - * when those instances are no longer required. - * </p> - * <p> - * This class requires the operating system's advanced graphics subsystem - * which may not be available on some platforms. - * </p> - * - * @see <a href="http://www.eclipse.org/swt/examples.php">SWT Example: GraphicsExample</a> - * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a> - * - * @since 3.1 - */ -public class Transform extends Resource { - /** - * the OS resource for the Transform - * (Warning: This field is platform dependent) - * <p> - * <b>IMPORTANT:</b> This field is <em>not</em> part of the SWT - * public API. It is marked public only so that it can be shared - * within the packages provided by SWT. It is not available on all - * platforms and should never be accessed from application code. - * </p> - */ - public double[] handle; - -/** - * Constructs a new identity Transform. - * <p> - * This operation requires the operating system's advanced - * graphics subsystem which may not be available on some - * platforms. - * </p> - * - * @param device the device on which to allocate the Transform - * - * @exception IllegalArgumentException <ul> - * <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</li> - * </ul> - * @exception SWTException <ul> - * <li>ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available</li> - * </ul> - * @exception SWTError <ul> - * <li>ERROR_NO_HANDLES if a handle for the Transform could not be obtained</li> - * </ul> - * - * @see #dispose() - */ -public Transform (Device device) { - this(device, 1, 0, 0, 1, 0, 0); -} - -/** - * Constructs a new Transform given an array of elements that represent the - * matrix that describes the transformation. - * <p> - * This operation requires the operating system's advanced - * graphics subsystem which may not be available on some - * platforms. - * </p> - * - * @param device the device on which to allocate the Transform - * @param elements an array of floats that describe the transformation matrix - * - * @exception IllegalArgumentException <ul> - * <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device, or the elements array is null</li> - * <li>ERROR_INVALID_ARGUMENT - if the elements array is too small to hold the matrix values</li> - * </ul> - * @exception SWTException <ul> - * <li>ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available</li> - * </ul> - * @exception SWTError <ul> - * <li>ERROR_NO_HANDLES if a handle for the Transform could not be obtained</li> - * </ul> - * - * @see #dispose() - */ -public Transform(Device device, float[] elements) { - this (device, checkTransform(elements)[0], elements[1], elements[2], elements[3], elements[4], elements[5]); -} - -/** - * Constructs a new Transform given all of the elements that represent the - * matrix that describes the transformation. - * <p> - * This operation requires the operating system's advanced - * graphics subsystem which may not be available on some - * platforms. - * </p> - * - * @param device the device on which to allocate the Transform - * @param m11 the first element of the first row of the matrix - * @param m12 the second element of the first row of the matrix - * @param m21 the first element of the second row of the matrix - * @param m22 the second element of the second row of the matrix - * @param dx the third element of the first row of the matrix - * @param dy the third element of the second row of the matrix - * - * @exception IllegalArgumentException <ul> - * <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</li> - * </ul> - * @exception SWTException <ul> - * <li>ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available</li> - * </ul> - * @exception SWTError <ul> - * <li>ERROR_NO_HANDLES if a handle for the Transform could not be obtained</li> - * </ul> - * - * @see #dispose() - */ -public Transform (Device device, float m11, float m12, float m21, float m22, float dx, float dy) { - super(device); - this.device.checkCairo(); - handle = new double[6]; - if (handle == null) SWT.error(SWT.ERROR_NO_HANDLES); - Cairo.cairo_matrix_init(handle, m11, m12, m21, m22, dx, dy); - init(); -} - -static float[] checkTransform(float[] elements) { - if (elements == null) SWT.error(SWT.ERROR_NULL_ARGUMENT); - if (elements.length < 6) SWT.error(SWT.ERROR_INVALID_ARGUMENT); - return elements; -} - -void destroy() { - handle = null; -} - -/** - * Fills the parameter with the values of the transformation matrix - * that the receiver represents, in the order {m11, m12, m21, m22, dx, dy}. - * - * @param elements array to hold the matrix values - * - * @exception SWTException <ul> - * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> - * </ul> - * @exception IllegalArgumentException <ul> - * <li>ERROR_NULL_ARGUMENT - if the parameter is null</li> - * <li>ERROR_INVALID_ARGUMENT - if the parameter is too small to hold the matrix values</li> - * </ul> - */ -public void getElements(float[] elements) { - if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED); - if (elements == null) SWT.error(SWT.ERROR_NULL_ARGUMENT); - if (elements.length < 6) SWT.error(SWT.ERROR_INVALID_ARGUMENT); - elements[0] = (float)handle[0]; - elements[1] = (float)handle[1]; - elements[2] = (float)handle[2]; - elements[3] = (float)handle[3]; - elements[4] = (float)handle[4]; - elements[5] = (float)handle[5]; -} - -/** - * Modifies the receiver such that the matrix it represents becomes the - * identity matrix. - * - * @exception SWTException <ul> - * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> - * </ul> - * - * @since 3.4 - */ -public void identity() { - if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED); - Cairo.cairo_matrix_init(handle, 1, 0, 0, 1, 0, 0); -} - -/** - * Modifies the receiver such that the matrix it represents becomes - * the mathematical inverse of the matrix it previously represented. - * - * @exception SWTException <ul> - * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> - * <li>ERROR_CANNOT_INVERT_MATRIX - if the matrix is not invertible</li> - * </ul> - */ -public void invert() { - if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED); - if (Cairo.cairo_matrix_invert(handle) != 0) { - SWT.error(SWT.ERROR_CANNOT_INVERT_MATRIX); - } -} - -/** - * Returns <code>true</code> if the Transform has been disposed, - * and <code>false</code> otherwise. - * <p> - * This method gets the dispose state for the Transform. - * When a Transform has been disposed, it is an error to - * invoke any other method using the Transform. - * - * @return <code>true</code> when the Transform is disposed, and <code>false</code> otherwise - */ -public boolean isDisposed() { - return handle == null; -} - -/** - * Returns <code>true</code> if the Transform represents the identity matrix - * and false otherwise. - * - * @return <code>true</code> if the receiver is an identity Transform, and <code>false</code> otherwise - */ -public boolean isIdentity() { - if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED); - float[] m = new float[6]; - getElements(m); - return m[0] == 1 && m[1] == 0 && m[2] == 0 && m[3] == 1 && m[4] == 0 && m[5] == 0; -} - -/** - * Modifies the receiver such that the matrix it represents becomes the - * the result of multiplying the matrix it previously represented by the - * argument. - * - * @param matrix the matrix to multiply the receiver by - * - * @exception SWTException <ul> - * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> - * </ul> - * @exception IllegalArgumentException <ul> - * <li>ERROR_NULL_ARGUMENT - if the parameter is null</li> - * <li>ERROR_INVALID_ARGUMENT - if the parameter has been disposed</li> - * </ul> - */ -public void multiply(Transform matrix) { - if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED); - if (matrix == null) SWT.error(SWT.ERROR_NULL_ARGUMENT); - if (matrix.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT); - Cairo.cairo_matrix_multiply(handle, matrix.handle, handle); -} - -/** - * Modifies the receiver so that it represents a transformation that is - * equivalent to its previous transformation rotated by the specified angle. - * The angle is specified in degrees and for the identity transform 0 degrees - * is at the 3 o'clock position. A positive value indicates a clockwise rotation - * while a negative value indicates a counter-clockwise rotation. - * - * @param angle the angle to rotate the transformation by - * - * @exception SWTException <ul> - * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> - * </ul> - */ -public void rotate(float angle) { - if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED); - Cairo.cairo_matrix_rotate(handle, angle * (float)Compatibility.PI / 180); -} - -/** - * Modifies the receiver so that it represents a transformation that is - * equivalent to its previous transformation scaled by (scaleX, scaleY). - * - * @param scaleX the amount to scale in the X direction - * @param scaleY the amount to scale in the Y direction - * - * @exception SWTException <ul> - * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> - * </ul> - */ -public void scale(float scaleX, float scaleY) { - if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED); - Cairo.cairo_matrix_scale(handle, scaleX, scaleY); -} - -/** - * Modifies the receiver to represent a new transformation given all of - * the elements that represent the matrix that describes that transformation. - * - * @param m11 the first element of the first row of the matrix - * @param m12 the second element of the first row of the matrix - * @param m21 the first element of the second row of the matrix - * @param m22 the second element of the second row of the matrix - * @param dx the third element of the first row of the matrix - * @param dy the third element of the second row of the matrix - * - * @exception SWTException <ul> - * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> - * </ul> - */ -public void setElements(float m11, float m12, float m21, float m22, float dx, float dy) { - if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED); - Cairo.cairo_matrix_init(handle, m11, m12, m21, m22, dx, dy); -} - -/** - * Modifies the receiver so that it represents a transformation that is - * equivalent to its previous transformation sheared by (shearX, shearY). - * - * @param shearX the shear factor in the X direction - * @param shearY the shear factor in the Y direction - * - * @exception SWTException <ul> - * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> - * </ul> - * - * @since 3.4 - */ -public void shear(float shearX, float shearY) { - if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED); - double[] matrix = {1, shearX, shearY, 1, 0, 0}; - Cairo.cairo_matrix_multiply(handle, matrix, handle); -} - -/** - * Given an array containing points described by alternating x and y values, - * modify that array such that each point has been replaced with the result of - * applying the transformation represented by the receiver to that point. - * - * @param pointArray an array of alternating x and y values to be transformed - * - * @exception IllegalArgumentException <ul> - * <li>ERROR_NULL_ARGUMENT - if the point array is null</li> - * </ul> - * @exception SWTException <ul> - * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> - * </ul> - */ -public void transform(float[] pointArray) { - if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED); - if (pointArray == null) SWT.error(SWT.ERROR_NULL_ARGUMENT); - double[] dx = new double[1], dy = new double[1]; - int length = pointArray.length / 2; - for (int i = 0, j = 0; i < length; i++, j += 2) { - dx[0] = pointArray[j]; - dy[0] = pointArray[j + 1]; - Cairo.cairo_matrix_transform_point(handle, dx, dy); - pointArray[j] = (float)dx[0]; - pointArray[j + 1] = (float)dy[0]; - } -} - -/** - * Modifies the receiver so that it represents a transformation that is - * equivalent to its previous transformation translated by (offsetX, offsetY). - * - * @param offsetX the distance to translate in the X direction - * @param offsetY the distance to translate in the Y direction - * - * @exception SWTException <ul> - * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> - * </ul> - */ -public void translate(float offsetX, float offsetY) { - if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED); - Cairo.cairo_matrix_translate(handle, offsetX, offsetY); -} - -/** - * Returns a string containing a concise, human-readable - * description of the receiver. - * - * @return a string representation of the receiver - */ -public String toString() { - if (isDisposed()) return "Transform {*DISPOSED*}"; - float[] elements = new float[6]; - getElements(elements); - return "Transform {" + elements [0] + "," + elements [1] + "," +elements [2] + "," +elements [3] + "," +elements [4] + "," +elements [5] + "}"; -} - -} |