I tired to set a text into a Jprogress bar by using setString method.. But it wasn't... So what do i do for that.. here is my code...
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class MyFrame extends JFrame{
JProgressBar pro_bar = new JProgressBar(0,100);
MyFrame(){
pro_bar.setSize(400,20);
pro_bar.setLocation(50,65);
add(pro_bar);
setLayout(null);
setSize(500,150);
setResizable(false);
setDefaultCloseOperation(3);
setLocationRelativeTo(null);
setVisible(true);
for(int i=0;i<100;i++){
pro_bar.setValue(i);
pro_bar.setString(null);
try {Thread.sleep(100);}catch (Exception e){}
}
}
}
class Demo{
public static void main(String args[]){
System.out.println("hello");
MyFrame f1=new MyFrame();
}
}
You're missing just one thing.
pro_bar.setStringPainted(true);
pro_bar.setValue(i);
pro_bar.setString(i +"%");
Set setStringPainted value to true before you set the String and the value.
Related
ReactNative:0.61.4
ReactNativeMaps:0.26.1
Android: 7 ~ 10
I found an error in FireBase Crashlytics while using ReactNativeMaps.
com.google.maps.api.android.lib6.gmm6.api.m.a (:com.google.android.gms.dynamite_mapsdynamite#200616061#20.06.16 (100300-0):5)
com.google.maps.api.android.lib6.impl.dd.a (:com.google.android.gms.dynamite_mapsdynamite#200616061#20.06.16 (100300-0):12)
com.google.android.gms.maps.internal.ag.a (:com.google.android.gms.dynamite_mapsdynamite#200616061#20.06.16 (100300-0):1)
ch.onTransact (:com.google.android.gms.dynamite_mapsdynamite#200616061#20.06.16 (100300-0):4)
android.os.Binder.transact (Binder.java:692)
com.google.android.gms.internal.maps.zza.zzb (unkonwSource:20)
com.google.android.gms.maps.internal.zzai.zza (unkonwSource:5)
com.google.android.gms.maps.zzm.onLocationChanged (unkonwSource:2)
com.airbnb.android.react.maps.FusedLocationSource$1.onSuccess (FusedLocationSource.java:46)
com.airbnb.android.react.maps.FusedLocationSource$1.onSuccess (FusedLocationSource.java:43)
com.google.android.gms.tasks.zzn.run (unkonwSource:4)
android.os.Handler.handleCallback (Handler.java:873)
android.os.Handler.dispatchMessage (Handler.java:99)
android.os.Looper.loop (Looper.java:205)
android.app.ActivityThread.main (ActivityThread.java:6996)
java.lang.reflect.Method.invoke (Method.java)
com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run (RuntimeInit.java:493)
com.android.internal.os.ZygoteInit.main (ZygoteInit.java:884)
I don't know where the rest of the code is
Because only FusedLocationSource is known
I saw FusedLocationSource but android.location.Location.getLatitude () doesn't exist.
package com.airbnb.android.react.maps;
import android.content.Context;
import android.location.Location;
import android.os.Looper;
import com.google.android.gms.location.FusedLocationProviderClient;
import com.google.android.gms.location.LocationCallback;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationResult;
import com.google.android.gms.location.LocationServices;
import com.google.android.gms.maps.LocationSource;
import com.google.android.gms.tasks.OnSuccessListener;
public class FusedLocationSource implements LocationSource {
private final FusedLocationProviderClient fusedLocationClientProviderClient;
private final LocationRequest locationRequest;
private LocationCallback locationCallback;
public FusedLocationSource(Context context){
fusedLocationClientProviderClient =
LocationServices.getFusedLocationProviderClient(context);
locationRequest = LocationRequest.create();
locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
locationRequest.setInterval(5000);
}
public void setPriority(int priority){
locationRequest.setPriority(priority);
}
public void setInterval(int interval){
locationRequest.setInterval(interval);
}
public void setFastestInterval(int fastestInterval){
locationRequest.setFastestInterval(fastestInterval);
}
#Override
public void activate(final OnLocationChangedListener onLocationChangedListener) {
fusedLocationClientProviderClient.getLastLocation().addOnSuccessListener(new OnSuccessListener<Location>() {
#Override
public void onSuccess(Location location) {
onLocationChangedListener.onLocationChanged(location);
}
});
locationCallback = new LocationCallback() {
#Override
public void onLocationResult(LocationResult locationResult) {
for (Location location : locationResult.getLocations()) {
onLocationChangedListener.onLocationChanged(location);
}
}
};
fusedLocationClientProviderClient.requestLocationUpdates(locationRequest, locationCallback, Looper.myLooper());
}
#Override
public void deactivate() {
fusedLocationClientProviderClient.removeLocationUpdates(locationCallback);
}
}
I know this is an error that occurs inside onSuccess, but I don't know how to fix it. Help.
check runtime permission for Android. May be this is an issue of permission and due to that you are not able to get location value.
Please forgive me if this has been asked but I have not found any matches yet.
I have some PDF files where images are duplicated on each page's resources but never used in its content stream. I think this is causing the PDFSplit command to create very bloated pages. Is there any utility code or examples to clean up unused resources like this? Maybe a starting point for me to get going?
I was able to clean up the resources for each page by gathering a list of the images used inside the page's content stream. With the list of images, I then check the resources for the page and remove any that weren't used. See the PageExtractor.stripUnusedImages below for implementation details.
The resource object was shared between pages so I also had to make sure each page had its own copy of the resource object before removing images. See PageExtractor.copyResources below for implementation details.
The page splitter:
package org.apache.pdfbox.examples;
import org.apache.pdfbox.contentstream.operator.Operator;
import org.apache.pdfbox.cos.COSBase;
import org.apache.pdfbox.cos.COSDictionary;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDResources;
import org.apache.pdfbox.pdmodel.interactive.action.PDAction;
import org.apache.pdfbox.pdmodel.interactive.action.PDActionGoTo;
import org.apache.pdfbox.pdmodel.interactive.annotation.PDAnnotation;
import org.apache.pdfbox.pdmodel.interactive.annotation.PDAnnotationLink;
import org.apache.pdfbox.pdmodel.interactive.documentnavigation.destination.PDDestination;
import org.apache.pdfbox.pdmodel.interactive.documentnavigation.destination.PDPageDestination;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
public class PageExtractor {
private final Logger log = LoggerFactory.getLogger(this.getClass());
public PDDocument extractPage(PDDocument source, Integer pageNumber) throws IOException {
PDDocument targetPdf = new PDDocument();
targetPdf.getDocument().setVersion(source.getVersion());
targetPdf.setDocumentInformation(source.getDocumentInformation());
targetPdf.getDocumentCatalog().setViewerPreferences(source.getDocumentCatalog().getViewerPreferences());
PDPage sourcePage = source.getPage(pageNumber);
PDPage targetPage = targetPdf.importPage(sourcePage);
targetPage.setResources(sourcePage.getResources());
stripUnusedImages(targetPage);
stripPageLinks(targetPage);
return targetPdf;
}
/**
* Collect the images used from a custom PDFStreamEngine (BI and DO operators)
* Create an empty COSDictionary
* Loop through the page's XObjects that are images and add them to the new COSDictionary if they were found in the PDFStreamEngine
* Assign the newly filled COSDictionary to the page's resource as COSName.XOBJECT
*/
protected void stripUnusedImages(PDPage page) throws IOException {
PDResources resources = copyResources(page);
COSDictionary pageObjects = (COSDictionary) resources.getCOSObject().getDictionaryObject(COSName.XOBJECT);
COSDictionary newObjects = new COSDictionary();
Set<String> imageNames = findImageNames(page);
Iterable<COSName> xObjectNames = resources.getXObjectNames();
for (COSName xObjectName : xObjectNames) {
if (resources.isImageXObject(xObjectName)) {
Boolean used = imageNames.contains(xObjectName.getName());
if (used) {
newObjects.setItem(xObjectName, pageObjects.getItem(xObjectName));
} else {
log.info("Found unused image: name={}", xObjectName.getName());
}
} else {
newObjects.setItem(xObjectName, pageObjects.getItem(xObjectName));
}
}
resources.getCOSObject().setItem(COSName.XOBJECT, newObjects);
page.setResources(resources);
}
/**
* It is necessary to copy the page's resources since it can be shared with other pages. We must ensure changes
* to the resources are scoped to the current page.
*/
protected PDResources copyResources(PDPage page) {
return new PDResources(new COSDictionary(page.getResources().getCOSObject()));
}
protected Set<String> findImageNames(PDPage page) throws IOException {
Set<String> imageNames = new HashSet<>();
PdfImageStreamEngine engine = new PdfImageStreamEngine() {
#Override
void handleImage(Operator operator, List<COSBase> operands) {
COSName name = (COSName) operands.get(0);
imageNames.add(name.getName());
}
};
engine.processPage(page);
return imageNames;
}
/**
* Borrowed from PDFBox page splitter
*
* #see org.apache.pdfbox.multipdf.Splitter#processAnnotations(org.apache.pdfbox.pdmodel.PDPage)
*/
protected void stripPageLinks(PDPage imported) throws IOException {
List<PDAnnotation> annotations = imported.getAnnotations();
for (PDAnnotation annotation : annotations) {
if (annotation instanceof PDAnnotationLink) {
PDAnnotationLink link = (PDAnnotationLink) annotation;
PDDestination destination = link.getDestination();
if (destination == null && link.getAction() != null) {
PDAction action = link.getAction();
if (action instanceof PDActionGoTo) {
destination = ((PDActionGoTo) action).getDestination();
}
}
if (destination instanceof PDPageDestination) {
// TODO preserve links to pages within the splitted result
((PDPageDestination) destination).setPage(null);
}
}
// TODO preserve links to pages within the splitted result
annotation.setPage(null);
}
}
}
The stream reader used to analyze the page's images:
package org.apache.pdfbox.examples;
import org.apache.pdfbox.contentstream.PDFStreamEngine;
import org.apache.pdfbox.contentstream.operator.Operator;
import org.apache.pdfbox.contentstream.operator.OperatorProcessor;
import org.apache.pdfbox.cos.COSBase;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.pdmodel.graphics.PDXObject;
import org.apache.pdfbox.pdmodel.graphics.form.PDFormXObject;
import org.apache.pdfbox.pdmodel.graphics.form.PDTransparencyGroup;
import java.io.IOException;
import java.util.List;
abstract public class PdfImageStreamEngine extends PDFStreamEngine {
PdfImageStreamEngine() {
addOperator(new DrawObjectCounter());
}
abstract void handleImage(Operator operator, List<COSBase> operands);
protected class DrawObjectCounter extends OperatorProcessor {
#Override
public void process(Operator operator, List<COSBase> operands) throws IOException {
if (operands != null && isImage(operands.get(0))) {
handleImage(operator, operands);
}
}
protected Boolean isImage(COSBase base) throws IOException {
if (!(base instanceof COSName)) {
return false;
}
COSName name = (COSName)base;
if (context.getResources().isImageXObject(name)) {
return true;
}
PDXObject xObject = context.getResources().getXObject(name);
if (xObject instanceof PDTransparencyGroup) {
context.showTransparencyGroup((PDTransparencyGroup)xObject);
} else if (xObject instanceof PDFormXObject) {
context.showForm((PDFormXObject)xObject);
}
return false;
}
#Override
public String getName() {
return "Do";
}
}
}
online system, the storm Bolt get NullPointerException,though I think I check it before line 61; It gets NullPointerException once in a while;
import ***.KeyUtils;
import ***.redis.PipelineHelper;
import ***.redis.PipelinedCacheClusterClient;
import **.redis.R2mClusterClient;
import org.apache.commons.lang3.StringUtils;
import org.apache.storm.task.OutputCollector;
import org.apache.storm.task.TopologyContext;
import org.apache.storm.topology.IRichBolt;
import org.apache.storm.topology.OutputFieldsDeclarer;
import org.apache.storm.tuple.Tuple;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import java.util.Map;
/**
* RedisBolt batch operate
*/
public class RedisBolt implements IRichBolt {
static final long serialVersionUID = 737015318988609460L;
private static ApplicationContext applicationContext;
private static long logEmitNumber = 0;
private static StringBuffer totalCmds = new StringBuffer();
private Logger logger = LoggerFactory.getLogger(getClass());
private OutputCollector _collector;
private R2mClusterClient r2mClusterClient;
#Override
public void prepare(Map map, TopologyContext topologyContext, OutputCollector outputCollector) {
_collector = outputCollector;
if (applicationContext == null) {
applicationContext = new ClassPathXmlApplicationContext("spring/spring-config-redisbolt.xml");
}
if (r2mClusterClient == null) {
r2mClusterClient = (R2mClusterClient) applicationContext.getBean("r2mClusterClient");
}
}
#Override
public void execute(Tuple tuple) {
String log = tuple.getString(0);
String lastCommands = tuple.getString(1);
try {
//log count
if (StringUtils.isNotEmpty(log)) {
logEmitNumber++;
}
if (StringUtils.isNotEmpty(lastCommands)) {
if(totalCmds==null){
totalCmds = new StringBuffer();
}
totalCmds.append(lastCommands);//line 61
}
//日志数量控制
int numberLimit = 1;
String flow_log_limit = r2mClusterClient.get(KeyUtils.KEY_PIPELINE_LIMIT);
if (StringUtils.isNotEmpty(flow_log_limit)) {
try {
numberLimit = Integer.parseInt(flow_log_limit);
} catch (Exception e) {
numberLimit = 1;
logger.error("error", e);
}
}
if (logEmitNumber >= numberLimit) {
StringBuffer _totalCmds = new StringBuffer(totalCmds);
try {
//pipeline submit
PipelinedCacheClusterClient pip = r2mClusterClient.pipelined();
String[] commandArray = _totalCmds.toString().split(KeyUtils.REDIS_CMD_SPILT);
PipelineHelper.cmd(pip, commandArray);
pip.sync();
pip.close();
totalCmds = new StringBuffer();
} catch (Exception e) {
logger.error("error", e);
}
logEmitNumber = 0;
}
} catch (Exception e) {
logger.error(new StringBuffer("====RedisBolt error for log=[ ").append(log).append("] \n commands=[").append(lastCommands).append("]").toString(), e);
_collector.reportError(e);
_collector.fail(tuple);
}
_collector.ack(tuple);
}
#Override
public void cleanup() {
}
#Override
public void declareOutputFields(OutputFieldsDeclarer outputFieldsDeclarer) {
}
#Override
public Map<String, Object> getComponentConfiguration() {
return null;
}
}
exception info:
java.lang.NullPointerException at java.lang.AbstractStringBuilder.ensureCapacityInternal(AbstractStringBuilder.java:113) at java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:415) at java.lang.StringBuffer.append(StringBuffer.java:237) at com.jd.jr.dataeye.storm.bolt.RedisBolt.execute(RedisBolt.java:61) at org.apache.storm.daemon.executor$fn__5044$tuple_action_fn__5046.invoke(executor.clj:727) at org.apache.storm.daemon.executor$mk_task_receiver$fn__4965.invoke(executor.clj:459) at org.apache.storm.disruptor$clojure_handler$reify__4480.onEvent(disruptor.clj:40) at org.apache.storm.utils.DisruptorQueue.consumeBatchToCursor(DisruptorQueue.java:472) at org.apache.storm.utils.DisruptorQueue.consumeBatchWhenAvailable(DisruptorQueue.java:451) at org.apache.storm.disruptor$consume_batch_when_available.invoke(disruptor.clj:73) at org.apache.storm.daemon.executor$fn__5044$fn__5057$fn__5110.invoke(executor.clj:846) at org.apache.storm.util$async_loop$fn__557.invoke(util.clj:484) at clojure.lang.AFn.run(AFn.java:22) at java.lang.Thread.run(Thread.java:745)
can anyone give me some advice to find the reason.
That is really odd thing to happen. Please read the code for two classes.
https://github.com/openjdk-mirror/jdk7u-jdk/blob/master/src/share/classes/java/lang/AbstractStringBuilder.java
https://github.com/openjdk-mirror/jdk7u-jdk/blob/master/src/share/classes/java/lang/StringBuffer.java
AbstractStringBuilder has constructor with no args which doesn't allocate the field 'value', which makes accessing the 'value' field being NPE. Any constructors in StringBuffer use that constructor. So maybe some odd thing happens in serialization/deserialization and unfortunately 'value' field in AbstractStringBuilder is being null.
Maybe initializing totalCmds in prepare() would be better, and also you need to consider synchronization (thread-safety) between bolts. prepare() can be called per bolt instance so fields are thread-safe, but class fields are not thread-safe.
I think I find the problem maybe;
the key point is
"StringBuffer _totalCmds = new StringBuffer(totalCmds);" and " totalCmds.append(lastCommands);//line 61"
when new a object, It takes serval steps:
(1) allocate memory and return reference
(2) initialize
if append after (1) and before (2) then the StringBuffer.java extends AbstractStringBuilder.java
/**
* The value is used for character storage.
*/
char[] value;
value is not initialized;so this will get null:
#Override
public synchronized void ensureCapacity(int minimumCapacity) {
if (minimumCapacity > value.length) {
expandCapacity(minimumCapacity);
}
}
this blot has a another question, some data maybe lost under a multithreaded environment
I would like to ask about library APACHE POI. I have a .pptx file and with the example which I found on internet I split each slide into separate images. This works great when slide containts .png, .jpeg images but as soon as I have .emf files in slide this image disappear. So I want to have the same copy of slide but with .emf file as well. Is this possible?
version: Apache POI 3.12
Thanks a lot
As mentioned in the comments, EMF is not supported out of the box ... and as FreeHep decided to have a LGPL license it's unlikely that we will include in our release.
In POI you basically have two options to provide a custom image renderer:
implement and register your ImageRenderer implementation in the Graphics2D context via setRenderingHint(Drawable.IMAGE_RENDERER, new MyImageRendener()). The drawback is, that it will be called for any images and you loose the default handling for bitmap/wmf images
or provide a custom DrawFactory which serves your own DrawPictureShape implementation - as in the example below - which only diverts to the EMF renderer when necessary
(looking at this example, the current POI ImageRenderer handling doesn't look flexible and instead of having a global handler, it might be better to register a handler per content-type ...)
Apart of the usual POI component I've included freehep-graphics2d, freehep-graphicsbase, freehep-graphicsio, freehep-graphicsio-emf and freehep-io.
The example is far from being finished, but I guess you get at least a kick-start:
package org.apache.poi.xslf;
import java.awt.Dimension;
import java.awt.Graphics2D;
import java.awt.Insets;
import java.awt.RenderingHints;
import java.awt.geom.AffineTransform;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import javax.imageio.ImageIO;
import org.apache.poi.sl.draw.DrawFactory;
import org.apache.poi.sl.draw.DrawPictureShape;
import org.apache.poi.sl.draw.Drawable;
import org.apache.poi.sl.draw.ImageRenderer;
import org.apache.poi.sl.usermodel.PictureData;
import org.apache.poi.sl.usermodel.PictureData.PictureType;
import org.apache.poi.sl.usermodel.PictureShape;
import org.apache.poi.util.POILogFactory;
import org.apache.poi.util.POILogger;
import org.apache.poi.xslf.usermodel.XMLSlideShow;
import org.apache.poi.xslf.usermodel.XSLFPictureShape;
import org.apache.poi.xslf.usermodel.XSLFSlide;
import org.freehep.graphicsio.emf.EMFInputStream;
import org.freehep.graphicsio.emf.EMFRenderer;
import org.junit.Test;
public class TestEMFRender {
private final static POILogger LOG = POILogFactory.getLogger(TestEMFRender.class);
#Test
public void render() throws Exception {
XMLSlideShow ppt = getDummy();
Dimension pgsize = ppt.getPageSize();
BufferedImage img = new BufferedImage((int)pgsize.getWidth(), (int)pgsize.getHeight(), BufferedImage.TYPE_INT_ARGB);
Graphics2D graphics = initGraphicsCtx(img);
// draw stuff
ppt.getSlides().get(0).draw(graphics);
// save the result
File outfile = new File("bla.png");
ImageIO.write(img, "PNG", outfile);
// cleanup
graphics.dispose();
img.flush();
ppt.close();
}
static XMLSlideShow getDummy() throws IOException {
XMLSlideShow ppt = new XMLSlideShow();
FileInputStream fis = new FileInputStream("kiwilogo.emf");
PictureData pd = ppt.addPicture(fis, PictureType.EMF);
fis.close();
XSLFSlide sl = ppt.createSlide();
XSLFPictureShape ps = sl.createPicture(pd);
ps.setAnchor(new Rectangle2D.Double(100, 100, 100, 100));
return ppt;
}
static Graphics2D initGraphicsCtx(BufferedImage img) {
Graphics2D graphics = img.createGraphics();
// default rendering options
graphics.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
graphics.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
graphics.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC);
graphics.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS, RenderingHints.VALUE_FRACTIONALMETRICS_ON);
// custom draw factory
DrawFactory df = new DrawFactory(){
public DrawPictureShape getDrawable(PictureShape<?,?> shape) {
return new DrawPictureShapeEmf(shape);
}
};
graphics.setRenderingHint(Drawable.DRAW_FACTORY, df);
df.fixFonts(graphics);
return graphics;
}
static class DrawPictureShapeEmf extends DrawPictureShape {
public DrawPictureShapeEmf(PictureShape<?,?> shape) {
super(shape);
}
#Override
public void drawContent(Graphics2D graphics) {
PictureData data = getShape().getPictureData();
if(data == null) return;
Rectangle2D anchor = getAnchor(graphics, getShape());
Insets insets = getShape().getClipping();
try {
String contentType = data.getContentType();
ImageRenderer renderer =
PictureType.EMF.contentType.equals(contentType)
? new ImgRenderer()
: super.getImageRenderer(graphics, contentType);
renderer.loadImage(data.getData(), data.getContentType());
renderer.drawImage(graphics, anchor, insets);
} catch (IOException e) {
LOG.log(POILogger.ERROR, "image can't be loaded/rendered.", e);
}
}
}
static class ImgRenderer implements ImageRenderer {
EMFRenderer emfRenderer;
public void loadImage(InputStream data, String contentType) throws IOException {
emfRenderer = new EMFRenderer(new EMFInputStream(data));
}
public void loadImage(byte[] data, String contentType) throws IOException {
loadImage(new ByteArrayInputStream(data), contentType);
}
public Dimension getDimension() {
return emfRenderer.getSize();
}
public void setAlpha(double alpha) {
}
public BufferedImage getImage() {
return null;
}
public BufferedImage getImage(Dimension dim) {
return null;
}
public boolean drawImage(Graphics2D ctx, Rectangle2D graphicsBounds) {
return drawImage(ctx, graphicsBounds, null);
}
public boolean drawImage(Graphics2D ctx, Rectangle2D graphicsBounds, Insets clip) {
AffineTransform at = ctx.getTransform();
try {
Dimension emfDim = emfRenderer.getSize();
// scale output bounds to image bounds
ctx.translate(graphicsBounds.getX(), graphicsBounds.getY());
ctx.scale(graphicsBounds.getWidth()/emfDim.getWidth(), graphicsBounds.getHeight()/emfDim.getHeight());
// TODO: handle clipping
emfRenderer.paint(ctx);
return true;
} catch (RuntimeException e) {
// TODO: logging
return false;
} finally {
ctx.setTransform(at);
}
}
}
}
I'm trying to bind a key to translate a GL_QUAD around the screen. I created a class, as I will attach below, that implements KeyListener, and within that I have a method that upon the keypress of 'd', adds 0.1 to the x coordinates of the quad vertices. Now, I have two questions relating to this.
Firstly, it doesn't seem to do anything. Upon the keypress, nothing happens to the object.
Is there a better way to achieve what I am trying to do? My end goal is to eventually end up with a sprite, that the camera is focused upon, that can move around a visually 2D game world.
Thanks for your time.
Code:
SpriteTest.java
package com.mangostudios.spritetest;
import java.awt.Frame;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.media.opengl.GLCapabilities;
import javax.media.opengl.GLProfile;
import javax.media.opengl.awt.GLCanvas;
import com.jogamp.opengl.util.FPSAnimator;
public class SpriteTest
{
public static void main(String[] args) {
GLProfile glp = GLProfile.getDefault();
GLCapabilities caps = new GLCapabilities(glp);
GLCanvas canvas = new GLCanvas(caps);
Frame frame = new Frame("AWT Window Test");
frame.setSize(300, 300);
frame.add(canvas);
frame.setVisible(true);
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
canvas.addGLEventListener(new Renderer());
FPSAnimator animator = new FPSAnimator(canvas, 60);
//animator.add(canvas);
animator.start();
}
}
Renderer.java
package com.mangostudios.spritetest;
import javax.media.opengl.GL2;
import javax.media.opengl.GLAutoDrawable;
import javax.media.opengl.GLEventListener;
public class Renderer implements GLEventListener {
InputListener input = new InputListener();
#Override
public void display(GLAutoDrawable drawable) {
update();
render(drawable);
}
#Override
public void dispose(GLAutoDrawable drawable) {
}
#Override
public void init(GLAutoDrawable drawable) {
}
#Override
public void reshape(GLAutoDrawable drawable, int x, int y, int w, int h) {
}
private void update() {
}
private void render(GLAutoDrawable drawable) {
GL2 gl = drawable.getGL().getGL2();
// draw a triangle filling the window
gl.glBegin(GL2.GL_QUADS);
gl.glVertex2f( input.xTran, 0.1f);
gl.glVertex2f( input.xTran,-0.1f);
gl.glVertex2f( -input.xTran, -0.1f);
gl.glVertex2f( -input.xTran, 0.1f);
gl.glEnd();
}
}
InputListener.java
package com.mangostudios.spritetest;
import com.jogamp.newt.event.KeyEvent;
import com.jogamp.newt.event.KeyListener;
public class InputListener implements KeyListener{
boolean loopBool = false;
float xTran = 0.1f;
float yTran = 0.1f;
#Override
public void keyPressed(KeyEvent d) {
loopBool = true;
while (loopBool = true) {
try {
Thread.sleep(100);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
#Override
public void keyReleased(KeyEvent d) {
}
}
At first, you never call addKeyListener(). Secondly, you shouldn't put an infinite loop into keyPressed(). Thirdly, you use a NEWT KeyListener whereas you use an AWT GLCanvas :s Rather use GLWindow with a NEWT KeyListener or use an AWT GLCanvas with an AWT KeyListener or use NewtCanvasAWT. Finally, before writing your own example, try mine on Wikipedia in order to understand why it works.