org/apache/sis/portrayal/TransformChangeEvent.html - sis-site - Git at Google

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 <div class="sub-title"><span class="package-label-in-type">Package</span>&nbsp;<a href="package-summary.html">org.apache.sis.portrayal</a></div>
 <h1 title="Class TransformChangeEvent" class="title">Class TransformChangeEvent</h1>
 </div>
 <div class="inheritance" title="Inheritance Tree"><a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a>
 <div class="inheritance"><a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/util/EventObject.html" title="class or interface in java.util" class="external-link">EventObject</a>
 <div class="inheritance"><a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.desktop/java/beans/PropertyChangeEvent.html" title="class or interface in java.beans" class="external-link">PropertyChangeEvent</a>
 <div class="inheritance">TransformChangeEvent</div>
 </div>
 </div>
 </div>
 <section class="class-description" id="class-description">
 <dl class="notes">
 <dt>All Implemented Interfaces:</dt>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/io/Serializable.html" title="class or interface in java.io" class="external-link">Serializable</a></code></dd>
 </dl>
 <hr>
 <div class="type-signature"><span class="modifiers">public class </span><span class="element-name type-name-label">TransformChangeEvent</span>
 <span class="extends-implements">extends <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.desktop/java/beans/PropertyChangeEvent.html" title="class or interface in java.beans" class="external-link">PropertyChangeEvent</a></span></div>
 <div class="block">A change in the "objective to display" transform that <code>Canvas</code> uses for rendering data.
  That transform is updated frequently following gestures events such as zoom, translation or rotation.
  All events fired by <a href="Canvas.html" title="class in org.apache.sis.portrayal"><code>Canvas</code></a> for the <a href="Canvas.html#OBJECTIVE_TO_DISPLAY_PROPERTY">"objectiveToDisplay"</a> property
  are instances of this class.
  This specialization provides methods for computing the difference between the old and new state.

  <h2>Multi-threading</h2>
  This class is <strong>not</strong> thread-safe.
  All listeners should process this event in the same thread.</div>
 <dl class="notes">
 <dt>Since:</dt>
 <dd>1.3</dd>
 <dt>See Also:</dt>
 <dd>
 <ul class="see-list-long">
 <li><a href="Canvas.html#OBJECTIVE_TO_DISPLAY_PROPERTY"><code>Canvas.OBJECTIVE_TO_DISPLAY_PROPERTY</code></a></li>
 <li><a href="../../../../serialized-form.html#org.apache.sis.portrayal.TransformChangeEvent">Serialized Form</a></li>
 </ul>
 </dd>

 <p><font size="-1">Defined in the <code>sis-portrayal</code> module</font></p>
 </dl>
 </section>
 <section class="summary">
 <ul class="summary-list">
 <!-- ======== NESTED CLASS SUMMARY ======== -->
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 <section class="nested-class-summary" id="nested-class-summary">
 <h2>Nested Class Summary</h2>
 <div class="caption"><span>Nested Classes</span></div>
 <div class="summary-table three-column-summary">
 <div class="table-header col-first">Modifier and Type</div>
 <div class="table-header col-second">Class</div>
 <div class="table-header col-last">Description</div>
 <div class="col-first even-row-color"><code>static enum&nbsp;</code></div>
 <div class="col-second even-row-color"><code><a href="TransformChangeEvent.Reason.html" class="type-name-link" title="enum class in org.apache.sis.portrayal">TransformChangeEvent.Reason</a></code></div>
 <div class="col-last even-row-color">
 <div class="block">The reason why the "objective to display" transform changed.</div>
 </div>
 </div>
 </section>
 </li>
 <!-- =========== FIELD SUMMARY =========== -->
 <li>
 <section class="field-summary" id="field-summary">
 <h2>Field Summary</h2>
 <div class="inherited-list">
 <h3 id="fields-inherited-from-class-EventObject">Fields inherited from class&nbsp;<a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/util/EventObject.html" title="class or interface in java.util" class="external-link">EventObject</a></h3>
 <code><a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/util/EventObject.html#source" title="class or interface in java.util" class="external-link">source</a></code></div>
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 <section class="constructor-summary" id="constructor-summary">
 <h2>Constructor Summary</h2>
 <div class="caption"><span>Constructors</span></div>
 <div class="summary-table two-column-summary">
 <div class="table-header col-first">Constructor</div>
 <div class="table-header col-last">Description</div>
 <div class="col-constructor-name even-row-color"><code><a href="#%3Cinit%3E(org.apache.sis.portrayal.Canvas,org.apache.sis.referencing.operation.transform.LinearTransform,org.apache.sis.referencing.operation.transform.LinearTransform,java.awt.geom.AffineTransform,java.awt.geom.AffineTransform,org.apache.sis.portrayal.TransformChangeEvent.Reason)" class="member-name-link">TransformChangeEvent</a><wbr>(<a href="Canvas.html" title="class in org.apache.sis.portrayal">Canvas</a>&nbsp;source,
  <a href="../referencing/operation/transform/LinearTransform.html" title="interface in org.apache.sis.referencing.operation.transform">LinearTransform</a>&nbsp;oldValue,
  <a href="../referencing/operation/transform/LinearTransform.html" title="interface in org.apache.sis.referencing.operation.transform">LinearTransform</a>&nbsp;newValue,
  <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.desktop/java/awt/geom/AffineTransform.html" title="class or interface in java.awt.geom" class="external-link">AffineTransform</a>&nbsp;objective,
  <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.desktop/java/awt/geom/AffineTransform.html" title="class or interface in java.awt.geom" class="external-link">AffineTransform</a>&nbsp;display,
  <a href="TransformChangeEvent.Reason.html" title="enum class in org.apache.sis.portrayal">TransformChangeEvent.Reason</a>&nbsp;reason)</code></div>
 <div class="col-last even-row-color">
 <div class="block">Creates a new event for an incremental change of the "objective to display" property.</div>
 </div>
 <div class="col-constructor-name odd-row-color"><code><a href="#%3Cinit%3E(org.apache.sis.portrayal.Canvas,org.apache.sis.referencing.operation.transform.LinearTransform,org.apache.sis.referencing.operation.transform.LinearTransform,org.apache.sis.portrayal.TransformChangeEvent.Reason)" class="member-name-link">TransformChangeEvent</a><wbr>(<a href="Canvas.html" title="class in org.apache.sis.portrayal">Canvas</a>&nbsp;source,
  <a href="../referencing/operation/transform/LinearTransform.html" title="interface in org.apache.sis.referencing.operation.transform">LinearTransform</a>&nbsp;oldValue,
  <a href="../referencing/operation/transform/LinearTransform.html" title="interface in org.apache.sis.referencing.operation.transform">LinearTransform</a>&nbsp;newValue,
  <a href="TransformChangeEvent.Reason.html" title="enum class in org.apache.sis.portrayal">TransformChangeEvent.Reason</a>&nbsp;reason)</code></div>
 <div class="col-last odd-row-color">
 <div class="block">Creates a new event for a change of the "objective to display" property.</div>
 </div>
 </div>
 </section>
 </li>
 <!-- ========== METHOD SUMMARY =========== -->
 <li>
 <section class="method-summary" id="method-summary">
 <h2>Method Summary</h2>
 <div id="method-summary-table">
 <div class="table-tabs" role="tablist" aria-orientation="horizontal"><button id="method-summary-table-tab0" role="tab" aria-selected="true" aria-controls="method-summary-table.tabpanel" tabindex="0" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table', 3)" class="active-table-tab">All Methods</button><button id="method-summary-table-tab2" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab2', 3)" class="table-tab">Instance Methods</button><button id="method-summary-table-tab4" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab4', 3)" class="table-tab">Concrete Methods</button></div>
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 <div class="summary-table three-column-summary" aria-labelledby="method-summary-table-tab0">
 <div class="table-header col-first">Modifier and Type</div>
 <div class="table-header col-second">Method</div>
 <div class="table-header col-last">Description</div>
 <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="../referencing/operation/transform/LinearTransform.html" title="interface in org.apache.sis.referencing.operation.transform">LinearTransform</a></code></div>
 <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#getDisplayChange()" class="member-name-link">getDisplayChange</a>()</code></div>
 <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Returns the change from old display coordinates to new display coordinates.</div>
 </div>
 <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/util/Optional.html" title="class or interface in java.util" class="external-link">Optional</a>&lt;<a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.desktop/java/awt/geom/AffineTransform.html" title="class or interface in java.awt.geom" class="external-link">AffineTransform</a>&gt;</code></div>
 <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#getDisplayChange2D()" class="member-name-link">getDisplayChange2D</a>()</code></div>
 <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Returns the change in display coordinates as a Java2D affine transform.</div>
 </div>
 <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="../referencing/operation/transform/LinearTransform.html" title="interface in org.apache.sis.referencing.operation.transform">LinearTransform</a></code></div>
 <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#getNewValue()" class="member-name-link">getNewValue</a>()</code></div>
 <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Gets the new "objective to display" transform.</div>
 </div>
 <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="../referencing/operation/transform/LinearTransform.html" title="interface in org.apache.sis.referencing.operation.transform">LinearTransform</a></code></div>
 <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#getObjectiveChange()" class="member-name-link">getObjectiveChange</a>()</code></div>
 <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Returns the change from old objective coordinates to new objective coordinates.</div>
 </div>
 <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/util/Optional.html" title="class or interface in java.util" class="external-link">Optional</a>&lt;<a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.desktop/java/awt/geom/AffineTransform.html" title="class or interface in java.awt.geom" class="external-link">AffineTransform</a>&gt;</code></div>
 <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#getObjectiveChange2D()" class="member-name-link">getObjectiveChange2D</a>()</code></div>
 <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Returns the change in objective coordinates as a Java2D affine transform.</div>
 </div>
 <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="../referencing/operation/transform/LinearTransform.html" title="interface in org.apache.sis.referencing.operation.transform">LinearTransform</a></code></div>
 <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#getOldValue()" class="member-name-link">getOldValue</a>()</code></div>
 <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Gets the old "objective to display" transform.</div>
 </div>
 <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="TransformChangeEvent.Reason.html" title="enum class in org.apache.sis.portrayal">TransformChangeEvent.Reason</a></code></div>
 <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#getReason()" class="member-name-link">getReason</a>()</code></div>
 <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Returns the reason why the "objective to display" transform changed.</div>
 </div>
 <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="Canvas.html" title="class in org.apache.sis.portrayal">Canvas</a></code></div>
 <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#getSource()" class="member-name-link">getSource</a>()</code></div>
 <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4">
 <div class="block">Returns the canvas on which this event initially occurred.</div>
 </div>
 </div>
 </div>
 </div>
 <div class="inherited-list">
 <h3 id="methods-inherited-from-class-PropertyChangeEvent">Methods inherited from class&nbsp;<a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.desktop/java/beans/PropertyChangeEvent.html" title="class or interface in java.beans" class="external-link">PropertyChangeEvent</a></h3>
 <code><a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.desktop/java/beans/PropertyChangeEvent.html#getPropagationId()" title="class or interface in java.beans" class="external-link">getPropagationId</a>, <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.desktop/java/beans/PropertyChangeEvent.html#getPropertyName()" title="class or interface in java.beans" class="external-link">getPropertyName</a>, <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.desktop/java/beans/PropertyChangeEvent.html#setPropagationId(java.lang.Object)" title="class or interface in java.beans" class="external-link">setPropagationId</a>, <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.desktop/java/beans/PropertyChangeEvent.html#toString()" title="class or interface in java.beans" class="external-link">toString</a></code></div>
 <div class="inherited-list">
 <h3 id="methods-inherited-from-class-Object">Methods inherited from class&nbsp;<a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></h3>
 <code><a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html#clone()" title="class or interface in java.lang" class="external-link">clone</a>, <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html#equals(java.lang.Object)" title="class or interface in java.lang" class="external-link">equals</a>, <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html#finalize()" title="class or interface in java.lang" class="external-link">finalize</a>, <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html#getClass()" title="class or interface in java.lang" class="external-link">getClass</a>, <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html#hashCode()" title="class or interface in java.lang" class="external-link">hashCode</a>, <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html#notify()" title="class or interface in java.lang" class="external-link">notify</a>, <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html#notifyAll()" title="class or interface in java.lang" class="external-link">notifyAll</a>, <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html#wait()" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html#wait(long)" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html#wait(long,int)" title="class or interface in java.lang" class="external-link">wait</a></code></div>
 </section>
 </li>
 </ul>
 </section>
 <section class="details">
 <ul class="details-list">
 <!-- ========= CONSTRUCTOR DETAIL ======== -->
 <li>
 <section class="constructor-details" id="constructor-detail">
 <h2>Constructor Details</h2>
 <ul class="member-list">
 <li>
 <section class="detail" id="&lt;init&gt;(org.apache.sis.portrayal.Canvas,org.apache.sis.referencing.operation.transform.LinearTransform,org.apache.sis.referencing.operation.transform.LinearTransform,org.apache.sis.portrayal.TransformChangeEvent.Reason)">
 <h3>TransformChangeEvent</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="element-name">TransformChangeEvent</span><wbr><span class="parameters">(<a href="Canvas.html" title="class in org.apache.sis.portrayal">Canvas</a>&nbsp;source,
  <a href="../referencing/operation/transform/LinearTransform.html" title="interface in org.apache.sis.referencing.operation.transform">LinearTransform</a>&nbsp;oldValue,
  <a href="../referencing/operation/transform/LinearTransform.html" title="interface in org.apache.sis.referencing.operation.transform">LinearTransform</a>&nbsp;newValue,
  <a href="TransformChangeEvent.Reason.html" title="enum class in org.apache.sis.portrayal">TransformChangeEvent.Reason</a>&nbsp;reason)</span></div>
 <div class="block">Creates a new event for a change of the "objective to display" property.
  The old and new transforms should not be null, except on initialization or for lazy computation:
  a null <code>newValue</code> means to take the value from <a href="Canvas.html#getObjectiveToDisplay()"><code>Canvas.getObjectiveToDisplay()</code></a> when needed.</div>
 <dl class="notes">
 <dt>Parameters:</dt>
 <dd><code>source</code> - the canvas that fired the event.</dd>
 <dd><code>oldValue</code> - the old "objective to display" transform, or <code>null</code> if none.</dd>
 <dd><code>newValue</code> - the new transform, or <code>null</code> for lazy computation.</dd>
 <dd><code>reason</code> - the reason why the "objective to display" transform changed..</dd>
 <dt>Throws:</dt>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/IllegalArgumentException.html" title="class or interface in java.lang" class="external-link">IllegalArgumentException</a></code> - if <code>source</code> is <code>null</code>.</dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="&lt;init&gt;(org.apache.sis.portrayal.Canvas,org.apache.sis.referencing.operation.transform.LinearTransform,org.apache.sis.referencing.operation.transform.LinearTransform,java.awt.geom.AffineTransform,java.awt.geom.AffineTransform,org.apache.sis.portrayal.TransformChangeEvent.Reason)">
 <h3>TransformChangeEvent</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="element-name">TransformChangeEvent</span><wbr><span class="parameters">(<a href="Canvas.html" title="class in org.apache.sis.portrayal">Canvas</a>&nbsp;source,
  <a href="../referencing/operation/transform/LinearTransform.html" title="interface in org.apache.sis.referencing.operation.transform">LinearTransform</a>&nbsp;oldValue,
  <a href="../referencing/operation/transform/LinearTransform.html" title="interface in org.apache.sis.referencing.operation.transform">LinearTransform</a>&nbsp;newValue,
  <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.desktop/java/awt/geom/AffineTransform.html" title="class or interface in java.awt.geom" class="external-link">AffineTransform</a>&nbsp;objective,
  <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.desktop/java/awt/geom/AffineTransform.html" title="class or interface in java.awt.geom" class="external-link">AffineTransform</a>&nbsp;display,
  <a href="TransformChangeEvent.Reason.html" title="enum class in org.apache.sis.portrayal">TransformChangeEvent.Reason</a>&nbsp;reason)</span></div>
 <div class="block">Creates a new event for an incremental change of the "objective to display" property.
  The incremental change can be specified by the <code>objective</code> and/or the <code>display</code> argument.
  Usually only one of those two arguments is non-null.</div>
 <dl class="notes">
 <dt>Parameters:</dt>
 <dd><code>source</code> - the canvas that fired the event.</dd>
 <dd><code>oldValue</code> - the old "objective to display" transform, or <code>null</code> if none.</dd>
 <dd><code>newValue</code> - the new transform, or <code>null</code> for lazy computation.</dd>
 <dd><code>objective</code> - the incremental change in objective coordinates, or <code>null</code> for lazy computation.</dd>
 <dd><code>display</code> - the incremental change in display coordinates, or <code>null</code> for lazy computation.</dd>
 <dd><code>reason</code> - the reason why the "objective to display" transform changed..</dd>
 <dt>Throws:</dt>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/IllegalArgumentException.html" title="class or interface in java.lang" class="external-link">IllegalArgumentException</a></code> - if <code>source</code> is <code>null</code>.</dd>
 </dl>
 </section>
 </li>
 </ul>
 </section>
 </li>
 <!-- ============ METHOD DETAIL ========== -->
 <li>
 <section class="method-details" id="method-detail">
 <h2>Method Details</h2>
 <ul class="member-list">
 <li>
 <section class="detail" id="getSource()">
 <h3>getSource</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="Canvas.html" title="class in org.apache.sis.portrayal">Canvas</a></span>&nbsp;<span class="element-name">getSource</span>()</div>
 <div class="block">Returns the canvas on which this event initially occurred.</div>
 <dl class="notes">
 <dt>Overrides:</dt>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/util/EventObject.html#getSource()" title="class or interface in java.util" class="external-link">getSource</a></code>&nbsp;in class&nbsp;<code><a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/util/EventObject.html" title="class or interface in java.util" class="external-link">EventObject</a></code></dd>
 <dt>Returns:</dt>
 <dd>the canvas on which this event initially occurred.</dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="getReason()">
 <h3>getReason</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="TransformChangeEvent.Reason.html" title="enum class in org.apache.sis.portrayal">TransformChangeEvent.Reason</a></span>&nbsp;<span class="element-name">getReason</span>()</div>
 <div class="block">Returns the reason why the "objective to display" transform changed.
  It may be because of canvas initialization, or an adjustment for a change of CRS
  without change in the viewing area, or a navigation for viewing a different area.</div>
 <dl class="notes">
 <dt>Returns:</dt>
 <dd>the reason why the "objective to display" transform changed.</dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="getOldValue()">
 <h3>getOldValue</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="../referencing/operation/transform/LinearTransform.html" title="interface in org.apache.sis.referencing.operation.transform">LinearTransform</a></span>&nbsp;<span class="element-name">getOldValue</span>()</div>
 <div class="block">Gets the old "objective to display" transform.</div>
 <dl class="notes">
 <dt>Overrides:</dt>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.desktop/java/beans/PropertyChangeEvent.html#getOldValue()" title="class or interface in java.beans" class="external-link">getOldValue</a></code>&nbsp;in class&nbsp;<code><a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.desktop/java/beans/PropertyChangeEvent.html" title="class or interface in java.beans" class="external-link">PropertyChangeEvent</a></code></dd>
 <dt>Returns:</dt>
 <dd>the old "objective to display" transform, or <code>null</code> if none.</dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="getNewValue()">
 <h3>getNewValue</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="../referencing/operation/transform/LinearTransform.html" title="interface in org.apache.sis.referencing.operation.transform">LinearTransform</a></span>&nbsp;<span class="element-name">getNewValue</span>()</div>
 <div class="block">Gets the new "objective to display" transform.
  It should be the current value of <a href="Canvas.html#getObjectiveToDisplay()"><code>Canvas.getObjectiveToDisplay()</code></a>.</div>
 <dl class="notes">
 <dt>Overrides:</dt>
 <dd><code><a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.desktop/java/beans/PropertyChangeEvent.html#getNewValue()" title="class or interface in java.beans" class="external-link">getNewValue</a></code>&nbsp;in class&nbsp;<code><a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.desktop/java/beans/PropertyChangeEvent.html" title="class or interface in java.beans" class="external-link">PropertyChangeEvent</a></code></dd>
 <dt>Returns:</dt>
 <dd>the new "objective to display" transform.</dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="getObjectiveChange()">
 <h3>getObjectiveChange</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="../referencing/operation/transform/LinearTransform.html" title="interface in org.apache.sis.referencing.operation.transform">LinearTransform</a></span>&nbsp;<span class="element-name">getObjectiveChange</span>()</div>
 <div class="block">Returns the change from old objective coordinates to new objective coordinates.
  When the "objective to display" transform changed (e.g. because the user did a zoom, translation or rotation),
  this method expresses how the "real world" coordinates (typically in metres) of any point on the screen changed.

  <div class="note"><b>Example:</b>
  if the map is shifted 10 metres toward the right side of the canvas, then (assuming no rotation or axis flip)
  the <var>x</var> translation coefficient of the change is +10 (same sign than <a href="#getDisplayChange()"><code>getDisplayChange()</code></a>).
  Note that it may correspond to any amount of pixels, depending on the zoom factor.</div>

  The <a href="#getObjectiveChange2D()"><code>getObjectiveChange2D()</code></a> method gives the same transform as a Java2D object.
  That change can be replicated on another canvas by giving the transform to
  <a href="PlanarCanvas.html#transformObjectiveCoordinates(java.awt.geom.AffineTransform)"><code>PlanarCanvas.transformObjectiveCoordinates(AffineTransform)</code></a>.</div>
 <dl class="notes">
 <dt>Returns:</dt>
 <dd>the change in objective coordinates. Usually not <code>null</code>,
          unless one of the canvas is initializing or has a non-invertible transform.</dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="getDisplayChange()">
 <h3>getDisplayChange</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="../referencing/operation/transform/LinearTransform.html" title="interface in org.apache.sis.referencing.operation.transform">LinearTransform</a></span>&nbsp;<span class="element-name">getDisplayChange</span>()</div>
 <div class="block">Returns the change from old display coordinates to new display coordinates.
  When the "objective to display" transform changed (e.g. because the user did a zoom, translation or rotation),
  this method expresses how the display coordinates (typically pixels) of any given point on the map changed.

  <div class="note"><b>Example:</b>
  if the map is shifted 10 pixels toward the right side of the canvas, then (assuming no rotation or axis flip)
  the <var>x</var> translation coefficient of the change is +10: the points on the map which were located at
  <var>x</var>=0 pixel before the change are now located at <var>x</var>=10 pixels after the change.</div>

  The <a href="#getDisplayChange2D()"><code>getDisplayChange2D()</code></a> method gives the same transform as a Java2D object.
  That change can be replicated on another canvas by giving the transform to
  <a href="PlanarCanvas.html#transformDisplayCoordinates(java.awt.geom.AffineTransform)"><code>PlanarCanvas.transformDisplayCoordinates(AffineTransform)</code></a>.</div>
 <dl class="notes">
 <dt>Returns:</dt>
 <dd>the change in display coordinates. Usually not <code>null</code>,
          unless one of the canvas is initializing or has a non-invertible transform.</dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="getObjectiveChange2D()">
 <h3>getObjectiveChange2D</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/util/Optional.html" title="class or interface in java.util" class="external-link">Optional</a>&lt;<a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.desktop/java/awt/geom/AffineTransform.html" title="class or interface in java.awt.geom" class="external-link">AffineTransform</a>&gt;</span>&nbsp;<span class="element-name">getObjectiveChange2D</span>()</div>
 <div class="block">Returns the change in objective coordinates as a Java2D affine transform.
  This method is suitable for two-dimensional canvas only.
  For performance reason, it does not clone the returned transform.</div>
 <dl class="notes">
 <dt>Returns:</dt>
 <dd>the change in objective coordinates. <strong>Do not modify.</strong></dd>
 <dt>See Also:</dt>
 <dd>
 <ul class="see-list">
 <li><a href="#getObjectiveChange()"><code>getObjectiveChange()</code></a></li>
 </ul>
 </dd>
 </dl>
 </section>
 </li>
 <li>
 <section class="detail" id="getDisplayChange2D()">
 <h3>getDisplayChange2D</h3>
 <div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/util/Optional.html" title="class or interface in java.util" class="external-link">Optional</a>&lt;<a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.desktop/java/awt/geom/AffineTransform.html" title="class or interface in java.awt.geom" class="external-link">AffineTransform</a>&gt;</span>&nbsp;<span class="element-name">getDisplayChange2D</span>()</div>
 <div class="block">Returns the change in display coordinates as a Java2D affine transform.
  This method is suitable for two-dimensional canvas only.
  For performance reason, it does not clone the returned transform.</div>
 <dl class="notes">
 <dt>Returns:</dt>
 <dd>the change in display coordinates. <strong>Do not modify.</strong></dd>
 <dt>See Also:</dt>
 <dd>
 <ul class="see-list">
 <li><a href="#getDisplayChange()"><code>getDisplayChange()</code></a></li>
 </ul>
 </dd>
 </dl>
 </section>
 </li>
 </ul>
 </section>
 </li>
 </ul>
 </section>
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