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https://github.com/tom91136/GestureFX

A lightweight pinch-to-zoom pane for JavaFX
https://github.com/tom91136/GestureFX

image-viewer imageview java java8 javafx javafx-library pinch-to-zoom

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A lightweight pinch-to-zoom pane for JavaFX

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README 

        
GestureFX

==========



[![Java CI](https://github.com/tom91136/GestureFX/actions/workflows/main.yaml/badge.svg)](https://github.com/tom91136/GestureFX/actions/workflows/main.yaml)

[![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)



A lightweight gesture enabled pane for JavaFX

 

Features



 * Accepts any `Node` or implementations of `net.kurobako.gesturefx.GesturePane.Transformable`

 * Pinch-to-zoom

 * Configurable behavior for trackpad events

 * Works with touch screen devices

 * Works in Swing via JFXPanel

 * Zoom/scroll to coordinate with animations

 * Mostly works in SceneBuilder*

 * Zero dependency

 * Works with both Java 8 and OpenJFX 11+



For comparison, this library is similar to [PhotoView](https://github.com/chrisbanes/PhotoView) 

for Android but supports gestures on any `Node` subclass.



*SceneBuilder renders the control properly and all the exposed properties are editable in the 

sidebar. Unfortunately, I have no idea how to make SceneBuilder treat this control as a 

container/control so the only way to add `GesturePane` to your FXML is to add it in XML and then 

open it in SceneBuilder. Pull requests welcome on solving this.



## How to use



**Versions <= 0.6.0 was published on JCenter, versions >= 0.7.1 is now published on Maven Central**



For Maven users, add the following to pom

```xml



    net.kurobako

    gesturefx

    0.7.1



```



For SBT

```scala

"net.kurobako" % "gesturefx" % "0.7.1"    

```



Alternatively, you can download the jar [here](https://repo.maven.apache.org/maven2/net/kurobako/gesturefx/0.7.1/gesturefx-0.7.1.jar)

 and add it to your classpath. This library has no dependencies, so you do not need to download 

anything else.

 

Version history in available in [CHANGELOG.md](CHANGELOG.md)



## Quick start



Adding an `ImageView` to `GesturePane`:



```java

Node node = new ImageView(getClass().getResource("/lena.png").toExternalForm());

GesturePane pane = new GesturePane(node);

```



Translate or zoom:



```java

GesturePane pane = //...



// zoom to 1x 

pane.zoomTo(1);



// centre on point [42,42] 

pane.centreOn(new Point2D(42, 42));



```

And with animations:



```java

pane.animate(Duration.millis(200)).zoomTo(1);

// animate with some options

pane.animate(Duration.millis(200))

		.interpolateWith(Interpolator.EASE_BOTH)

		.beforeStart(() -> System.out.println("Starting..."))

		.afterFinished(() -> System.out.println("Done!"))

		.centreOn(new Point2D(42, 42));



```

Double click to zoom in:

```java

// zoom*2 on double-click

GesturePane pane = //...

pane.setOnMouseClicked(e -> {

	if (e.getButton() == MouseButton.PRIMARY && e.getClickCount() == 2) {

		Point2D pivotOnTarget = pane.targetPointAt(new Point2D(e.getX(), e.getY()))

				                        .orElse(pane.targetPointAtViewportCentre());

		// increment of scale makes more sense exponentially instead of linearly 

		pane.animate(Duration.millis(200))

				.interpolateWith(Interpolator.EASE_BOTH)

				.zoomBy(pane.getCurrentScale(), pivotOnTarget);

	}

});

```



For more interesting examples, take a look at the [samples](gesturefx-sample/src/main/java/net/kurobako/gesturefx/sample).



## Samples



Several samples have been included demoing interesting uses of the gesture pane.



**JavaFX 8**



You can download the sample jar [here](https://repo.maven.apache.org/maven2/net/kurobako/gesturefx-sample/0.7.1/gesturefx-sample-0.7.1-jar-with-dependencies.jar) 

or clone the project and run:



    ./mvnw install

    ./mvnw exec:java -pl gesturefx-sample

    



**OpenJFX 11+**



Make sure you have at least JDK 11 installed:



    > java -version

    openjdk version "11.0.4" 2019-07-16

    OpenJDK Runtime Environment 18.9 (build 11.0.4+11)

    OpenJDK 64-Bit Server VM 18.9 (build 11.0.4+11, mixed mode, sharing)



Run the sample jar with the following:



    java -Dglass.gtk.uiScale=200% --module-path path/to/javafx-sdk-13/lib --add-modules javafx.controls,javafx.fxml,javafx.web,javafx.swing -jar gesturefx-sample-0.7.1-jar-with-dependencies.jar



See  for more details.



The `-Dglass.gtk.uiScale=200%` flag is optional if OpenJFX does not detect HiDPI monitors automatically. 

On Windows the flag should be `-Dglass.win.uiScale=N%`.



## How to build



To ensure the project is usable with Java 8 and [OpenJFX](https://openjfx.io/), you must build against Java 8. 



Prerequisites:



 * JDK 8 with JavaFX

 

Be aware that some OpenJDK distributions does not include JavaFX or have missing webkit libraries which is required for the sample to build. 



Clone the project and then in project root:



    # *nix:

    ./mvnw clean package 

    # Windows:

    mvnw clean package



If JDK 8 is not your main JDK, prepend the correct `JAVA_HOME` before any maven command (e.g `JAVA_HOME=/usr/java/jdk1.8.0_161/ mvn clean compile`).



This project uses maven wrapper so you do not need to install maven

beforehand.



For testing on new platforms, it is recommended to run tests headful. Add the headful flag to test

with real window:



    mvnw test -Dheadful



**NOTE: Be aware that running the tests headful will spawn actual windows and take over the mouse 

and keyboard; you will see the test window flicker while different unit tests are invoked.**



## Release process



1. Commit all changes before release

2. Make sure `${user.home}/.m2/settings.xml` exist, if not copy it from maven home (i.e `cp usr/share/maven/conf/settings.xml ~/.m2/settings.xml` ) and add the following section to ``:



    ```xml

    

      ossrh

      ${jira-username}

      ${jira-password}

    

    ```

    Look up jira-username and jira-password is the username and password for sonatype, also make sure machine has SSH access to GitHub

3. Run `mvn release:prepare -DdryRun=true -Darguments=-DskipTests`, make sure it succeeds 

4. Run `mvn release:clean` to clean up from the release dry run 

5. Run `mvn release:prepare -Darguments=-DskipTests`, maven will tag and commit the new version. 

6. Inspect the commits after `release:prepare` and do a push, also push the tags via `git push --tags`

7. Finally, run `mvn clean release:perform -Darguments=-DskipTests` to create docs and sources and upload sonatype

8. Complete the release process by closing via `cd target/checkout && mvn nexus-staging:release` 



## Motivation



Someone has to do it.



## Acknowledgements



Features or designs of this library was originally developed as part of an undergraduate coursework 

assignment at the 

[*University of Bristol*](http://www.bristol.ac.uk/engineering/departments/computerscience/). 






YourKit supports the GestureFX project with its full-featured Java Profiler.

YourKit, LLC is the creator [YourKit Java Profiler](https://www.yourkit.com/java/profiler/index.jsp)

and [YourKit .NET Profiler](https://www.yourkit.com/.net/profiler/index.jsp),

innovative and intelligent tools for profiling Java and .NET applications.



## Licence



    Copyright 2021 WeiChen Lin

    

    Licensed under the Apache License, Version 2.0 (the "License");

    you may not use this file except in compliance with the License.

    You may obtain a copy of the License at

    

       http://www.apache.org/licenses/LICENSE-2.0

    

    Unless required by applicable law or agreed to in writing, software

    distributed under the License is distributed on an "AS IS" BASIS,

    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

    See the License for the specific language governing permissions and

    limitations under the License.