--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwt/graphics/Transform.d	Sat Aug 09 17:00:02 2008 +0200
@@ -0,0 +1,385 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2007 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
+ *******************************************************************************/
+module dwt.graphics.Transform;
+
+import dwt.dwthelper.utils;
+
+import dwt.DWT;
+import dwt.DWTError;
+import dwt.DWTException;
+import dwt.internal.cocoa.NSAffineTransform;
+import dwt.internal.cocoa.NSAffineTransformStruct;
+import dwt.internal.cocoa.NSPoint;
+
+/**
+ * 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>
+ * 
+ * @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 DWT
+     * public API. It is marked public only so that it can be shared
+     * within the packages provided by DWT. It is not available on all
+     * platforms and should never be accessed from application code.
+     * </p>
+     */
+    public NSAffineTransform 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 DWTException <ul>
+ *    <li>ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available</li>
+ * </ul>
+ * @exception DWTError <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 DWTException <ul>
+ *    <li>ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available</li>
+ * </ul>
+ * @exception DWTError <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 DWTException <ul>
+ *    <li>ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available</li>
+ * </ul>
+ * @exception DWTError <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);
+    handle = NSAffineTransform.transform();
+    if (handle is null) DWT.error(DWT.ERROR_NO_HANDLES);
+    handle.retain();
+    setElements(m11, m12, m21, m22, dx, dy);
+    init();
+}
+
+static float[] checkTransform(float[] elements) {
+    if (elements is null) DWT.error(DWT.ERROR_NULL_ARGUMENT);
+    if (elements.length < 6) DWT.error(DWT.ERROR_INVALID_ARGUMENT);
+    return elements;
+}
+
+void destroy() {
+    handle.release();
+    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 DWTException <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()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
+    if (elements is null) DWT.error(DWT.ERROR_NULL_ARGUMENT);
+    if (elements.length < 6) DWT.error(DWT.ERROR_INVALID_ARGUMENT);
+    NSAffineTransformStruct struct = handle.transformStruct();
+    elements[0] = struct.m11;
+    elements[1] = struct.m12;
+    elements[2] = struct.m21;
+    elements[3] = struct.m22;
+    elements[4] = struct.tX;
+    elements[5] = struct.tY;
+}
+
+public void identity() {
+    if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
+    NSAffineTransformStruct struct = new NSAffineTransformStruct();
+    struct.m11 = 1;
+    struct.m22 = 1;
+    handle.setTransformStruct(struct);
+}
+
+/**
+ * Modifies the receiver such that the matrix it represents becomes the
+ * the mathematical inverse of the matrix it previously represented. 
+ *
+ * @exception DWTException <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()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
+    NSAffineTransformStruct struct = handle.transformStruct();
+    if ((struct.m11 * struct.m22 - struct.m12 * struct.m21) is 0) {
+        DWT.error(DWT.ERROR_CANNOT_INVERT_MATRIX);
+    }
+    handle.invert();
+}
+
+/**
+ * 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 bool isDisposed() {
+    return handle is 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 bool isIdentity() {
+    if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
+    NSAffineTransformStruct struct = handle.transformStruct();
+    return struct.m11 is 1 && struct.m12 is 0 && struct.m21 is 0 && struct.m22 is 1 && struct.tX is 0 && struct.tY is 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 DWTException <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()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
+    if (matrix is null) DWT.error(DWT.ERROR_NULL_ARGUMENT);
+    if (matrix.isDisposed()) DWT.error(DWT.ERROR_INVALID_ARGUMENT);
+    handle.prependTransform(matrix.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 DWTException <ul>
+ *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
+ * </ul>
+ */
+public void rotate(float angle) {
+    if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
+    handle.rotateByDegrees(angle);
+}
+
+/**
+ * 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 DWTException <ul>
+ *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
+ * </ul>
+ */
+public void scale(float scaleX, float scaleY) {
+    if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
+    handle.scaleXBy(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 DWTException <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()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
+    NSAffineTransformStruct struct = new NSAffineTransformStruct();
+    struct.m11 = m11;
+    struct.m12 = m12;
+    struct.m21 = m21;
+    struct.m22 = m22;
+    struct.tX = dx;
+    struct.tY = dy;
+    handle.setTransformStruct(struct);
+}
+
+public void shear(float shearX, float shearY) {
+    if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
+    NSAffineTransformStruct struct = new NSAffineTransformStruct();
+    struct.m11 = 1;
+    struct.m12 = shearX;
+    struct.m21 = shearY;
+    struct.m22 = 1;
+    NSAffineTransform matrix = NSAffineTransform.transform();
+    matrix.setTransformStruct(struct);
+    handle.prependTransform(matrix);
+}
+
+/** 
+ * 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 DWTException <ul>
+ *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
+ * </ul>
+ */
+public void transform(float[] pointArray) {
+    if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
+    if (pointArray is null) DWT.error(DWT.ERROR_NULL_ARGUMENT);
+    NSPoint point = new NSPoint();
+    int length = pointArray.length / 2;
+    for (int i = 0, j = 0; i < length; i++, j += 2) {
+        point.x = pointArray[j];
+        point.y = pointArray[j + 1];
+        point = handle.transformPoint(point);
+        pointArray[j] = point.x;                
+        pointArray[j + 1] = point.y;                
+    }
+}
+
+/**
+ * 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 DWTException <ul>
+ *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
+ * </ul>
+ */
+public void translate(float offsetX, float offsetY) {
+    if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
+    handle.translateXBy(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] + "}";
+}
+
+}