I am a beginner in java(fx).
How do you get the mouse location in x and y in JavaFX? I tried using AWT's MouseInfo(also imported it), but it's not working. I also saw the code for it in Ensembles(that dragging the ball-window in "advanced stage", that's what I need to do, drag my undecorated JavaFX stage), but it also doesn't work. I am using FXML with controller, and I guess that's the main problem. Should I switch back to the single-file simple JavaFX? I know FXML is better for laying out the UI, but I can't get many of such codes to work. Or do I need some other sort of code for my controller? Please give proper codes with comments wherever possible.
If you need a bit of my code to inspect, feel free to ask.
There are a few items in your question - I'll tackle them one at a time.
How do you get the mouse location in x and y in JavaFX?
Add a mouse event handler to the appropriate JavaFX component that you want to track the mouse location in. A JavaFX mouse event will report multiple different kinds of co-ordinates. The x and y co-ordinates are relative to the top left corner of the node whose location is being monitored. The sceneX and sceneY co-ordinates are relative to the scene's top left 0,0 co-ordinates. The screenX and screenY co-ordinates are relative to the top left 0,0 co-ordinates of the current screen.
These co-ordinates are documented in the MouseEvent documentation. There is extra information in understanding co-ordinate systems in the Node and Scene documentation.
import javafx.application.Application;
import static javafx.application.Application.launch;
import javafx.event.*;
import javafx.scene.*;
import javafx.scene.control.*;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.VBox;
import javafx.stage.*;
public class MouseLocationReporter extends Application {
private static final String OUTSIDE_TEXT = "Outside Label";
public static void main(String[] args) { launch(args); }
#Override public void start(final Stage stage) {
final Label reporter = new Label(OUTSIDE_TEXT);
Label monitored = createMonitoredLabel(reporter);
VBox layout = new VBox(10);
layout.setStyle("-fx-background-color: cornsilk; -fx-padding: 10px;");
layout.getChildren().setAll(
monitored,
reporter
);
layout.setPrefWidth(500);
stage.setScene(
new Scene(layout)
);
stage.show();
}
private Label createMonitoredLabel(final Label reporter) {
final Label monitored = new Label("Mouse Location Monitor");
monitored.setStyle("-fx-background-color: forestgreen; -fx-text-fill: white; -fx-font-size: 20px;");
monitored.setOnMouseMoved(new EventHandler<MouseEvent>() {
#Override public void handle(MouseEvent event) {
String msg =
"(x: " + event.getX() + ", y: " + event.getY() + ") -- " +
"(sceneX: " + event.getSceneX() + ", sceneY: " + event.getSceneY() + ") -- " +
"(screenX: " + event.getScreenX()+ ", screenY: " + event.getScreenY() + ")";
reporter.setText(msg);
}
});
monitored.setOnMouseExited(new EventHandler<MouseEvent>() {
#Override public void handle(MouseEvent event) {
reporter.setText(OUTSIDE_TEXT);
}
});
return monitored;
}
}
I tried using AWT's MouseInfo(also imported it), but it's not working.
Don't do this. Mixing different graphical toolkits (for example Swing/AWT and JavaFX) is an advanced topic. In general, if you are writing a JavaFX application, avoid importing anything from the java.awt namespace and the javax.swing namespace. You only really need to use those if you have a large, existing Swing based application or framework that you need to inter-operate with your JavaFX application. In this case, you don't have that situation.
I also saw the code for it in Ensembles(that dragging the ball-window in "advanced stage", that's what I need to do, drag my undecorated JavaFX stage), but it also doesn't work.
I tried the Ensemble Advanced Stage sample and dragging that stage around worked for me.
Another sample for dragging an undecorated stage in JavaFX is in the answer to How to draw a clock with JavaFX 2? which has associated sample code. The method used to make the undecorated stage draggable for the clock sample is:
/** makes a stage draggable using a given node */
public static void makeDraggable(final Stage stage, final Node byNode) {
final Delta dragDelta = new Delta();
byNode.setOnMousePressed(new EventHandler<MouseEvent>() {
#Override public void handle(MouseEvent mouseEvent) {
// record a delta distance for the drag and drop operation.
dragDelta.x = stage.getX() - mouseEvent.getScreenX();
dragDelta.y = stage.getY() - mouseEvent.getScreenY();
byNode.setCursor(Cursor.MOVE);
}
});
byNode.setOnMouseReleased(new EventHandler<MouseEvent>() {
#Override public void handle(MouseEvent mouseEvent) {
byNode.setCursor(Cursor.HAND);
}
});
byNode.setOnMouseDragged(new EventHandler<MouseEvent>() {
#Override public void handle(MouseEvent mouseEvent) {
stage.setX(mouseEvent.getScreenX() + dragDelta.x);
stage.setY(mouseEvent.getScreenY() + dragDelta.y);
}
});
byNode.setOnMouseEntered(new EventHandler<MouseEvent>() {
#Override public void handle(MouseEvent mouseEvent) {
if (!mouseEvent.isPrimaryButtonDown()) {
byNode.setCursor(Cursor.HAND);
}
}
});
byNode.setOnMouseExited(new EventHandler<MouseEvent>() {
#Override public void handle(MouseEvent mouseEvent) {
if (!mouseEvent.isPrimaryButtonDown()) {
byNode.setCursor(Cursor.DEFAULT);
}
}
});
}
I am using FXML with controller, and I guess that's the main problem. Should I switch back to the single-file simple JavaFX? I know FXML is better for laying out the UI, but I can't get many of such codes to work.
Lack of understanding and familiarity with the underlying JavaFX APIs is probably your main problem rather than use of FXML. However the additional complexity fxml implies together with the lighter documentation and samples for it on the web may be contributing to your hardships. If use of FXML is making it difficult for you to understand how to get some JavaFX functions to work, I advise to stop using FXML for now. Code the logic by hand using the Java APIs and refer to the Oracle JavaFX tutorials and the Ensemble sample code when you encounter things which are difficult for you.
Once you are comfortable coding directly to the JavaFX API, switch back to using FXML for larger projects which contain many GUI elements. The FXML elements and attributes themselves are built almost completely upon reflection of the standard JavaFX APIs. So, if you understand the core JavaFX APIs, you also understand almost everything about FXML.
Please do not post follow up comments to this answer (as this answer is long enough as it is). If you have new questions, create a new question (one question per question).
What about using Robot for that purpose ?
http://docs.oracle.com/javase/1.5.0/docs/api/java/awt/Robot.html
Using Robots, it is different from posting event to AWT event queue. Events are generated in the native event queue. Actually, with Robot.mouseMove you will not only set mouse position and not only get position.
For getting mouse position, you may stick to MouseInfo
import java.awt.MouseInfo;
// get the mouse's position
Point p = MouseInfo.getPointerInfo().getLocation();
It's not working: are you with Mac ? Which is your version of JavaFX ? seems to be issues corrected for FX8. For mac only, you may use
com.sun.glass.ui.Robot robot =
com.sun.glass.ui.Application.GetApplication().createRobot();
// getPosition of the mouse in Mac
int x = robot.getMouseX();
int y = robot.getMouseY();
JavaFx 8 WindowEvent doesn't provide the (x,y) location of the mouse, unfortunately. I solved this (and it works fine) by using the AWT MouseInfo like this:
Tooltip t = new Tooltip();
Tooltip.install(yournode, t);
t.setOnShowing(ev -> {// called just prior to being shown
Point mouse = java.awt.MouseInfo.getPointerInfo().getLocation();
Point2D local = yournode.screenToLocal(mouse.x, mouse.y);
// my app-specific code to get the chart's yaxis value
// then set the text as I want
double pitch = yaxis.getValueForDisplay(local.getY()).doubleValue();
double freq = AudioUtil.pitch2frequency(pitch);
t.setText(String.format("Pitch %.1f: %.1f Hz %.1f samples", pitch, freq, audio.rate / freq));
});
Related
I have 3(Three) BoxCollider2D components where 2(two) have OnTrigger checked in my Object and both have different functions. Due to having OnTrigger on both, the projectiles I am casting collide with the wrong collider and instead activate that function. Is there a way to ignore 1(one) OnTrigger collider?
I have already tried Layer-based collision detection and set up a layer. Unfortunately, the object now collides with the collider which eliminates the player on collision
However, there are several ways to solve this problem. All kinds of physics.checks as well as raycasts but this code helps you to ignore the obstacle collider.
public Collider2D playerCollider;
public Collider2D obstacleCollider;
public void Start() => Physics2D.IgnoreCollision(playerCollider, obstacleCollider);
I have a very simple script I use to handle collisions in my games.
It's very easy to setup because it makes everything drop and draggable, which is a much easier way to program.
Below is the script and below that is instructions on how to use. Note it is a layer based system, but you can select multiple layers.
[System.Serializable]
public class TriggerEvent : UnityEvent<Collider> { }
[System.Serializable]
public class CollisionEvent : UnityEvent<Collision>{ }
public class EnterEvent: MonoBehaviour
{
public TriggerEvent TriggerEnteredEvent;
public CollisionEvent CollisionEnteredEvent;
[SerializedField]private LayerMask validLayers;
// Initalize Event System
void Awake()
{
if (OnTriggerEnter == null)
{
TriggerEnteredEvent = new TriggerEvent();
}
if (OnCollisionEnter == null)
{
CollisionEnteredEvent = new CollisionEvent();
}
}
// Called if transform is a trigger
void OnTriggerEnter(Collider collider)
{
if (validLayers == (validLayers | 1 << collider.gameObject.layer))
{
TriggerEnteredEvent?.Invoke(collider);
}
}
// Called if transform is not a trigger
void OnCollisionEnter(Collision collision)
{
if (validLayers == (validLayers | 1 << collision.gameObject.layer))
{
CollisionEnteredEvent?.Invoke(collision);
}
}
}
This is how it would work, and in this example I will be "coding" it from the perspective of a Bullet.
Basically I want to check if I (The Bullet) hits either the terrain or an enemy then call the relevent funcitons in the Bullet class respectively.
Obviously if I hit an enemy I want to deal damage.
So this will be my example bullet class
public class Bullet : MonoBehaviour
{
public int BulletDamage = 10;
public int BulletSpeed = 5;
void FixedUpdate() => transform.position = Vector3.Lerp(transform.position, transform.position + transform.forward * speed * Time.deltaTime, 1f);
public void OnEnemyHit(Collision collision)
{
// Try to get the enemy script
Enemy enemy = collision.gameObject.transform.GetComponent<Enemy>();
if (enemy != null)
{
enemy.DealDamage(this.BulletDamage);
}
}
public void OnTerrainHit(Collision collision)
{
Destroy(this.gameObject);
}
}
Add the EnterEvent script to the bullet.
Add the Bullet Script to the bullet.
There will be a space on the Inspecter where you can add your events. It should have a Plus and Minus in the top right corner. Press the plus.
From the inspector drag the bullet in game GameObject to the open space provider.
In the dropdown to the right, click on it, look for the Bullet Script, and select the OnEnemyHit function from it.
Create another event, do the exact same, but this time select the OnTerrainHit funciton instead - now but would be called in the order you added them.
Just underneath the event system should be the be able to see a dropdown for the Layers. Select all the layers you want your bullet to interact with. In this case it will be the Enemy and Terrain.
Finally remember to setup your layers properly. Ensure the Enemy has an Enemy Layer, the Terrain has a Terrain Layer, Bullet bullet layer and Player has a Player Layer
I have currently developed an ultimately open source application to analyse some data in a table view and visualise the resulting data in some additional plots. A problematic thing with this is, that the generated plots could potentially be useful for end users for e.g. a presentation, further downstream informative discussion and so on. This is why I started working on an export function using ImageWriter
//adding a context menu item to the chart
final MenuItem saveAsPng = new MenuItem("Save as png");
saveAsPng.setOnAction(new EventHandler<ActionEvent>() {
#Override public void handle(ActionEvent event) {
int scale = 6; //6x resolution should be enough, users should downscale if required
final Bounds bounds = bc.getLayoutBounds();
final SnapshotParameters spa = new SnapshotParameters();
spa.setTransform(javafx.scene.transform.Transform.scale(scale, scale));
ImageWriter imageWriter = new ImageWriter();
try {
imageWriter.saveImage(stage, bc.snapshot(spa, null));
} catch (ImageException e) {
e.printStackTrace();
}
}
});
This successfully creates a PNG file with sufficient size, but my ideal solution would be to export in vector-based format, e.g. PDF/SVG. For Swing applications, I knew how to achieve this, but for JFX I couldn't really find a proper solution for that matter. I already investigated several potential ideas, e.g. using a printer dialogue and then exporting as a PDF via virtual printer, but that does result in a bitmap inside the PDF, too.
Any ideas on this?
I have three fragments in a view pager:
A -> B -> C
I would like to get the strings of my two edittexts in Fragment A on swipe to Fragment B to show them in Fragment B. The edittext data may be changed up until the swipe.
Someone has suggested listening for typing and sending data after each one, but the callbacks I know for that change state EVERY key click (which can be expensive). How do I this without using buttons, since their right next to each other, for a more delightful experience?
You can check the data of the EditText on swipe ; if it's not null, then you can send it to any other fragment using Bundle since you are dealing with fragments
With help from #I. Leonard I found a solution here.
It was deprecated so I used the newer version. I put the below code in my fragment class because I needed access to the data without complicating things. It works like a charm!
On the page listener callback, I suggest, calling an interface for inter-fragment communication to do your actions on your home activity or to call the appropriate fragment that can do the work, from the activity.
// set content to next page on scroll start
vPager = (ViewPager) getActivity().findViewById(R.id.viewpager);
vPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
#Override
public void onPageSelected(int position) {
}
#Override
public void onPageScrollStateChanged(int state) {
if (state == ViewPager.SCROLL_STATE_SETTLING) {
// ViewPager is slowing down to settle on a page
if (vPager.getCurrentItem() == 1) {
// The page to be settled on is the second (Preview) page
if (!areFieldsNull(boxOne.getText().toString(), boxTwo.getText().toString()))
// call interface method in view pager activity using interface reference
communicator.preview(boxOne.getText().toString(), boxTwo.getText().toString());
}
}
}
});
so I'm developing a game for android in LibGDX and I've stumbled upon a problem: I have a scene with an image in it and I want to be able to click/touch the image and make stuff happen after doing so.
I've been trying to google a solution for the past day but I keep on missing something vital. Here's my code:
public class ScreenSplash implements Screen {
private Texture textureGlobe = new Texture(Gdx.files.internal("graphics/splash.png"));
private Image imageGlobe = new Image((new TextureRegion(textureGlobe)));
public ScreenSplash() {
imageGlobe.addListener(new InputListener() {
public boolean touchDown(InputEvent event, float x, float y, int pointer, int button) {
Gdx.app.log(Game.LOG, "image clicked");
return true;
}
});
stageGame.addActor(imageGlobe);
}
...
}
I've also heard that I'm supposed to put this somewhere:
Gdx.input.setInputProcessor(inputProcessor);
But I don't really know what to do with it.
Your Stage is your InputProcessor so do something like Gdx.input.setInputProcessor(stageGame);. The Stage will route the events to the actors.
Ah, I've found out what the problem was.
I imported java.awt.event.InputEvent instead of com.badlogic.gdx.scenes.scene2d.InputEvent and the touchDown function wasn't properly overriden because of this.
I wrote a wxPython program that I am translating to wxWidgets. The program has a scrolled window that displays an image. Following Rappin, wxPython In Action (Listing 12.1), I used a StaticBitmap within a panel. While surfing the latest wxWidgets documentation, I found a dire warning that wxStaticBitmap should only be used for very small images. It says, "... you should use your own control if you want to display larger images portably." Okay. Show me. I don't have my "own control."
Was Rappin wrong, or is the documentation out of date?
The question - a newbie one, no doubt - is what is the right way to do a simple image-view window in wxWidgets? A drop-in replacement for wxStaticBitmap would be nice. I looked into the "image" program in the wxWidgets "samples" directory. It's as long a War and Peace. Surely there must be a canned class or a simple recipe.
Don't let the size of the "image" sample fool you, only a few lines of code are necessary to do what you want.
Search for the MyImageFrame class in the image.cpp file, it is nothing more than a class with a private bitmap field, a custom constructor to set the bitmap and the window client size, and an event handler for EVT_PAINT:
void OnPaint(wxPaintEvent& WXUNUSED(event))
{
wxPaintDC dc( this );
dc.DrawBitmap( m_bitmap, 0, 0, true /* use mask */ );
}
Since you don't want a frame class here's your recipe: You create a simple descendant of wxWindow that has a similar constructor, paint handler and duplicates the methods of wxStaticBitmap that you use in your code. Maybe simply one method to set a new bitmap and resize the control to the new bitmap dimensions.
// A scrolled window for showing an image.
class PictureFrame: public wxScrolledWindow
{
public:
PictureFrame()
: wxScrolledWindow()
, bitmap(0,0)
{;}
void Create(wxWindow *parent, wxWindowID id = -1)
{
wxScrolledWindow::Create(parent, id);
}
void LoadImage(wxImage &image) {
bitmap = wxBitmap(image);
SetVirtualSize(bitmap.GetWidth(), bitmap.GetHeight());
wxClientDC dc(this);
PrepareDC(dc);
dc.DrawBitmap(bitmap, 0, 0);
}
protected:
wxBitmap bitmap;
void OnMouse(wxMouseEvent &event) {
int xx,yy;
CalcUnscrolledPosition(event.GetX(), event.GetY(), &xx, &yy);
event.m_x = xx; event.m_y = yy;
event.ResumePropagation(1); // Pass along mouse events (e.g. to parent)
event.Skip();
}
void OnPaint(wxPaintEvent &event) {
wxPaintDC dc(this);
PrepareDC(dc);
dc.DrawBitmap(bitmap, 0,0, true);
}
private:
DECLARE_EVENT_TABLE()
};
BEGIN_EVENT_TABLE(PictureFrame,wxScrolledWindow)
EVT_PAINT(PictureFrame::OnPaint)
EVT_MOUSE_EVENTS(PictureFrame::OnMouse)
END_EVENT_TABLE()