{"id":3611,"date":"2010-03-12T11:31:22","date_gmt":"2010-03-12T14:31:22","guid":{"rendered":"https:\/\/eliezerladeira.com.br\/blog\/?p=3611"},"modified":"2026-02-09T11:56:45","modified_gmt":"2026-02-09T14:56:45","slug":"animation-bounce","status":"publish","type":"post","link":"https:\/\/eliezerladeira.com.br\/blog\/animation-bounce\/","title":{"rendered":"Animation: bounce"},"content":{"rendered":"
\n
\n

import <\/strong>java.awt.BasicStroke;<\/code>
\nimport <\/strong>java.awt.BorderLayout;<\/code>
\nimport <\/strong>java.awt.Checkbox;<\/code>
\nimport <\/strong>java.awt.Color;<\/code>
\nimport <\/strong>java.awt.Dimension;<\/code>
\nimport <\/strong>java.awt.Font;<\/code>
\nimport <\/strong>java.awt.Frame;<\/code>
\nimport <\/strong>java.awt.GradientPaint;<\/code>
\nimport <\/strong>java.awt.Graphics;<\/code>
\nimport <\/strong>java.awt.Graphics2D;<\/code>
\nimport <\/strong>java.awt.Image;<\/code>
\nimport <\/strong>java.awt.Label;<\/code>
\nimport <\/strong>java.awt.Panel;<\/code>
\nimport <\/strong>java.awt.RenderingHints;<\/code>
\nimport <\/strong>java.awt.Shape;<\/code>
\nimport <\/strong>java.awt.Stroke;<\/code>
\nimport <\/strong>java.awt.event.ComponentAdapter;<\/code>
\nimport <\/strong>java.awt.event.ComponentEvent;<\/code>
\nimport <\/strong>java.awt.event.ItemEvent;<\/code>
\nimport <\/strong>java.awt.event.ItemListener;<\/code>
\nimport <\/strong>java.awt.font.FontRenderContext;<\/code>
\nimport <\/strong>java.awt.font.GlyphVector;<\/code>
\nimport <\/strong>java.awt.geom.GeneralPath;<\/code>
\nimport <\/strong>java.awt.geom.Rectangle2D;<\/code>
\nimport <\/strong>java.text.NumberFormat;<\/code>
\nimport <\/strong>java.util.Random;<\/code><\/p>\n

import <\/strong>javax.swing.JFrame;<\/code>
\nimport <\/strong>javax.swing.JPanel;<\/code><\/p>\n

public class <\/strong>Bouncer extends <\/strong>JPanel implements <\/strong>Runnable {<\/code>
\nprivate boolean <\/strong>trucking = true<\/strong>;<\/code><\/p>\n

private long<\/strong>[] previousTimes; \/\/ milliseconds<\/code><\/p>\n

private int <\/strong>previousIndex;<\/code><\/p>\n

private boolean <\/strong>previousFilled;<\/code><\/p>\n

private double <\/strong>frameRate; \/\/ frames per second<\/code><\/p>\n

private <\/strong>Image image;<\/code><\/p>\n

public static void <\/strong>main(String[] args) {<\/code>
\nfinal <\/strong>Bouncer bouncer = new <\/strong>Bouncer();<\/code>
\nFrame f = new <\/strong>AnimationFrame(bouncer);<\/code>
\nf.setFont(new <\/strong>Font(\"Serif\", Font.PLAIN, 12));<\/code>
\nf.setSize(200, 200);<\/code>
\nPanel controls = new <\/strong>Panel();<\/code>
\ncontrols.add(bouncer.createCheckbox(\"Anti.\", Bouncer.ANTIALIASING));<\/code>
\ncontrols.add(bouncer.createCheckbox(\"Trans.\", Bouncer.TRANSFORM));<\/code>
\ncontrols.add(bouncer.createCheckbox(\"Gradient\", Bouncer.GRADIENT));<\/code>
\ncontrols.add(bouncer.createCheckbox(\"Outline\", Bouncer.OUTLINE));<\/code>
\ncontrols.add(bouncer.createCheckbox(\"Dotted\", Bouncer.DOTTED));<\/code>
\ncontrols.add(bouncer.createCheckbox(\"Axes\", Bouncer.AXES));<\/code>
\ncontrols.add(bouncer.createCheckbox(\"Clip\", Bouncer.CLIP));<\/code>
\nf.add(controls, BorderLayout.NORTH);<\/code><\/p>\n

f.setVisible(true<\/strong>);<\/code>
\n}<\/code><\/p>\n

\/\/ Tweakable variables<\/code>
\nprivate boolean <\/strong>mAntialiasing, mGradient, mOutline;<\/code><\/p>\n

private boolean <\/strong>mTransform, mDotted, mAxes, mClip;<\/code><\/p>\n

\/\/ ...and the constants that represent them. See setSwitch().<\/code>
\npublic static final int <\/strong>ANTIALIASING = 0;<\/code><\/p>\n

public static final int <\/strong>GRADIENT = 1;<\/code><\/p>\n

public static final int <\/strong>OUTLINE = 2;<\/code><\/p>\n

public static final int <\/strong>TRANSFORM = 3;<\/code><\/p>\n

public static final int <\/strong>DOTTED = 4;<\/code><\/p>\n

public static final int <\/strong>AXES = 5;<\/code><\/p>\n

public static final int <\/strong>CLIP = 6;<\/code><\/p>\n

private float<\/strong>[] mPoints;<\/code><\/p>\n

private float<\/strong>[] mDeltas;<\/code><\/p>\n

private float <\/strong>mTheta;<\/code><\/p>\n

private int <\/strong>mN;<\/code><\/p>\n

private <\/strong>Shape mClipShape;<\/code><\/p>\n

public <\/strong>Bouncer() {<\/code>
\npreviousTimes = new long<\/strong>[128];<\/code>
\npreviousTimes[0] = System.currentTimeMillis();<\/code>
\npreviousIndex = 1;<\/code>
\npreviousFilled = false<\/strong>;<\/code><\/p>\n

mN = 38;<\/code>
\nmPoints = new float<\/strong>[mN];<\/code>
\nmDeltas = new float<\/strong>[mN];<\/code>
\nRandom random = new <\/strong>Random();<\/code>
\nfor <\/strong>(int <\/strong>i = 0; i < mN; i++) {<\/code>
\nmPoints[i] = random.nextFloat() * 500;<\/code>
\nmDeltas[i] = random.nextFloat() * 3;<\/code>
\n}<\/code><\/p>\n

addComponentListener(new <\/strong>ComponentAdapter() {<\/code>
\npublic void <\/strong>componentResized(ComponentEvent ce) {<\/code>
\nDimension d = getSize();<\/code>
\nfor <\/strong>(int <\/strong>i = 0; i < mN; i++) {<\/code>
\nint <\/strong>limit = ((i % 2) == 0) ? d.width : d.height;<\/code>
\nif <\/strong>(mPoints[i] < 0)<\/code>
\nmPoints[i] = 0;<\/code>
\nelse if <\/strong>(mPoints[i] >= limit)<\/code>
\nmPoints[i] = limit - 1;<\/code>
\n}<\/code>
\n}<\/code>
\n});<\/code>
\n}<\/code><\/p>\n

public void <\/strong>setSwitch(int <\/strong>item, boolean <\/strong>value) {<\/code>
\nswitch <\/strong>(item) {<\/code>
\ncase <\/strong>ANTIALIASING:<\/code>
\nmAntialiasing = value;<\/code>
\nbreak<\/strong>;<\/code>
\ncase <\/strong>GRADIENT:<\/code>
\nmGradient = value;<\/code>
\nbreak<\/strong>;<\/code>
\ncase <\/strong>OUTLINE:<\/code>
\nmOutline = value;<\/code>
\nbreak<\/strong>;<\/code>
\ncase <\/strong>TRANSFORM:<\/code>
\nmTransform = value;<\/code>
\nbreak<\/strong>;<\/code>
\ncase <\/strong>DOTTED:<\/code>
\nmDotted = value;<\/code>
\nbreak<\/strong>;<\/code>
\ncase <\/strong>AXES:<\/code>
\nmAxes = value;<\/code>
\nbreak<\/strong>;<\/code>
\ncase <\/strong>CLIP:<\/code>
\nmClip = value;<\/code>
\nbreak<\/strong>;<\/code>
\ndefault<\/strong>:<\/code>
\nbreak<\/strong>;<\/code>
\n}<\/code>
\n}<\/code><\/p>\n

protected <\/strong>Checkbox createCheckbox(String label, final int <\/strong>item) {<\/code>
\nCheckbox check = new <\/strong>Checkbox(label);<\/code>
\ncheck.addItemListener(new <\/strong>ItemListener() {<\/code>
\npublic void <\/strong>itemStateChanged(ItemEvent ie) {<\/code>
\nsetSwitch(item, (ie.getStateChange() == ie.SELECTED));<\/code>
\n}<\/code>
\n});<\/code>
\nreturn <\/strong>check;<\/code>
\n}<\/code><\/p>\n

public void <\/strong>timeStep() {<\/code>
\nDimension d = getSize();<\/code>
\nfor <\/strong>(int <\/strong>i = 0; i < mN; i++) {<\/code>
\nfloat <\/strong>value = mPoints[i] + mDeltas[i];<\/code>
\nint <\/strong>limit = ((i % 2) == 0) ? d.width : d.height;<\/code>
\nif <\/strong>(value < 0 || value > limit) {<\/code>
\nmDeltas[i] = -mDeltas[i];<\/code>
\nmPoints[i] += mDeltas[i];<\/code>
\n} else<\/strong><\/code>
\nmPoints[i] = value;<\/code>
\n}<\/code>
\nmTheta += Math.PI \/ 192;<\/code>
\nif <\/strong>(mTheta > (2 * Math.PI))<\/code>
\nmTheta -= (2 * Math.PI);<\/code>
\n}<\/code><\/p>\n

public void <\/strong>paint(Graphics g) {<\/code>
\nGraphics2D g2 = (Graphics2D) g;<\/code>
\nsetAntialiasing(g2);<\/code>
\nsetClip(g2);<\/code>
\nsetTransform(g2);<\/code>
\nShape shape = createShape();<\/code>
\nsetPaint(g2);<\/code><\/p>\n

g2.fill(shape);<\/code><\/p>\n

if <\/strong>(mOutline) {<\/code>
\nsetStroke(g2);<\/code>
\ng2.setPaint(Color.blue);<\/code>
\ng2.draw(shape);<\/code>
\n}<\/code>
\ndrawAxes(g2);<\/code>
\n}<\/code><\/p>\n

protected void <\/strong>setAntialiasing(Graphics2D g2) {<\/code>
\nif <\/strong>(mAntialiasing == false<\/strong>)<\/code>
\nreturn<\/strong>;<\/code>
\ng2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,<\/code>
\nRenderingHints.VALUE_ANTIALIAS_ON);<\/code>
\n}<\/code><\/p>\n

protected void <\/strong>setClip(Graphics2D g2) {<\/code>
\nif <\/strong>(mClip == false<\/strong>)<\/code>
\nreturn<\/strong>;<\/code>
\nif <\/strong>(mClipShape == null<\/strong>) {<\/code>
\nDimension d = getSize();<\/code>
\nFontRenderContext frc = g2.getFontRenderContext();<\/code>
\nFont font = new <\/strong>Font(\"Serif\", Font.PLAIN, 144);<\/code>
\nString s = \"Java Source and Support!\";<\/code>
\nGlyphVector gv = font.createGlyphVector(frc, s);<\/code>
\nRectangle2D bounds = font.getStringBounds(s, frc);<\/code>
\nmClipShape = gv.getOutline(<\/code>
\n(d.width - (float<\/strong>) bounds.getWidth()) \/ 2,<\/code>
\n(d.height + (float<\/strong>) bounds.getHeight()) \/ 2);<\/code>
\n}<\/code>
\ng2.clip(mClipShape);<\/code>
\n}<\/code><\/p>\n

protected void <\/strong>setTransform(Graphics2D g2) {<\/code>
\nif <\/strong>(mTransform == false<\/strong>)<\/code>
\nreturn<\/strong>;<\/code>
\nDimension d = getSize();<\/code>
\ng2.rotate(mTheta, d.width \/ 2, d.height \/ 2);<\/code>
\n}<\/code><\/p>\n

protected <\/strong>Shape createShape() {<\/code>
\nGeneralPath path = new <\/strong>GeneralPath(GeneralPath.WIND_EVEN_ODD,<\/code>
\nmPoints.length);<\/code>
\npath.moveTo(mPoints[0], mPoints[1]);<\/code>
\nfor <\/strong>(int <\/strong>i = 2; i < mN; i += 6)<\/code>
\npath.curveTo(mPoints[i], mPoints[i + 1], mPoints[i + 2],<\/code>
\nmPoints[i + 3], mPoints[i + 4], mPoints[i + 5]);<\/code>
\npath.closePath();<\/code>
\nreturn <\/strong>path;<\/code>
\n}<\/code><\/p>\n

protected void <\/strong>setPaint(Graphics2D g2) {<\/code>
\nif <\/strong>(mGradient) {<\/code>
\nGradientPaint gp = new <\/strong>GradientPaint(0, 0, Color.yellow, 50, 25,<\/code>
\nColor.red, true<\/strong>);<\/code>
\ng2.setPaint(gp);<\/code>
\n} else<\/strong><\/code>
\ng2.setPaint(Color.orange);<\/code>
\n}<\/code><\/p>\n

protected void <\/strong>setStroke(Graphics2D g2) {<\/code>
\nif <\/strong>(mDotted == false<\/strong>)<\/code>
\nreturn<\/strong>;<\/code><\/p>\n

Stroke stroke = new <\/strong>BasicStroke(1, BasicStroke.CAP_BUTT,<\/code>
\nBasicStroke.JOIN_ROUND, 10, new float<\/strong>[] { 4, 4 }, 0);<\/code>
\ng2.setStroke(stroke);<\/code>
\n}<\/code><\/p>\n

protected void <\/strong>drawAxes(Graphics2D g2) {<\/code>
\nif <\/strong>(mAxes == false<\/strong>)<\/code>
\nreturn<\/strong>;<\/code>
\ng2.setPaint(getForeground());<\/code>
\ng2.setStroke(new <\/strong>BasicStroke());<\/code>
\nDimension d = getSize();<\/code>
\nint <\/strong>side = 20;<\/code>
\nint <\/strong>arrow = 4;<\/code>
\nint <\/strong>w = d.width \/ 2, h = d.height \/ 2;<\/code>
\ng2.drawLine(w - side, h, w + side, h);<\/code>
\ng2.drawLine(w + side - arrow, h - arrow, w + side, h);<\/code>
\ng2.drawLine(w, h - side, w, h + side);<\/code>
\ng2.drawLine(w + arrow, h + side - arrow, w, h + side);<\/code>
\n}<\/code><\/p>\n

public void <\/strong>run() {<\/code>
\nwhile <\/strong>(trucking) {<\/code>
\nrender();<\/code>
\ntimeStep();<\/code>
\ncalculateFrameRate();<\/code>
\n}<\/code>
\n}<\/code><\/p>\n

protected void <\/strong>render() {<\/code>
\nGraphics g = getGraphics();<\/code>
\nif <\/strong>(g != null<\/strong>) {<\/code>
\nDimension d = getSize();<\/code>
\nif <\/strong>(checkImage(d)) {<\/code>
\nGraphics imageGraphics = image.getGraphics();<\/code><\/p>\n

imageGraphics.setColor(getBackground());<\/code>
\nimageGraphics.fillRect(0, 0, d.width, d.height);<\/code>
\nimageGraphics.setColor(getForeground());<\/code><\/p>\n

paint(imageGraphics);<\/code><\/p>\n

g.drawImage(image, 0, 0, null<\/strong>);<\/code><\/p>\n

imageGraphics.dispose();<\/code>
\n}<\/code>
\ng.dispose();<\/code>
\n}<\/code>
\n}<\/code><\/p>\n

\/\/ Offscreen image.<\/code>
\nprotected boolean <\/strong>checkImage(Dimension d) {<\/code>
\nif <\/strong>(d.width == 0 || d.height == 0)<\/code>
\nreturn false<\/strong>;<\/code>
\nif <\/strong>(image == null <\/strong>|| image.getWidth(null<\/strong>) != d.width<\/code>
\n|| image.getHeight(null<\/strong>) != d.height) {<\/code>
\nimage = createImage(d.width, d.height);<\/code>
\n}<\/code>
\nreturn true<\/strong>;<\/code>
\n}<\/code><\/p>\n

protected void <\/strong>calculateFrameRate() {<\/code>
\n\/\/ Measure the frame rate<\/code>
\nlong <\/strong>now = System.currentTimeMillis();<\/code>
\nint <\/strong>numberOfFrames = previousTimes.length;<\/code>
\ndouble <\/strong>newRate;<\/code>
\n\/\/ Use the more stable method if a history is available.<\/code>
\nif <\/strong>(previousFilled)<\/code>
\nnewRate = (double<\/strong>) numberOfFrames<\/code>
\n\/ (double<\/strong>) (now - previousTimes[previousIndex]) * 1000.0;<\/code>
\nelse<\/strong><\/code>
\nnewRate = 1000.0 \/ (double<\/strong>) (now - previousTimes[numberOfFrames - 1]);<\/code>
\nfirePropertyChange(\"frameRate\", frameRate, newRate);<\/code>
\nframeRate = newRate;<\/code>
\n\/\/ Update the history.<\/code>
\npreviousTimes[previousIndex] = now;<\/code>
\npreviousIndex++;<\/code>
\nif <\/strong>(previousIndex >= numberOfFrames) {<\/code>
\npreviousIndex = 0;<\/code>
\npreviousFilled = true<\/strong>;<\/code>
\n}<\/code>
\n}<\/code><\/p>\n

public double <\/strong>getFrameRate() {<\/code>
\nreturn <\/strong>frameRate;<\/code>
\n}<\/code><\/p>\n

\/\/ Property change support.<\/code>
\nprivate transient <\/strong>AnimationFrame mRateListener;<\/code><\/p>\n

public void <\/strong>setRateListener(AnimationFrame af) {<\/code>
\nmRateListener = af;<\/code>
\n}<\/code><\/p>\n

public void <\/strong>firePropertyChange(String name, double <\/strong>oldValue, double <\/strong>newValue) {<\/code>
\nmRateListener.rateChanged(newValue);<\/code>
\n}<\/code><\/p>\n

}<\/code><\/p>\n

class <\/strong>AnimationFrame extends <\/strong>JFrame {<\/code>
\nprivate <\/strong>Label mStatusLabel;<\/code><\/p>\n

private <\/strong>NumberFormat mFormat;<\/code><\/p>\n

public <\/strong>AnimationFrame(Bouncer ac) {<\/code>
\nsuper<\/strong>();<\/code>
\nsetLayout(new <\/strong>BorderLayout());<\/code>
\nadd(ac, BorderLayout.CENTER);<\/code>
\nadd(mStatusLabel = new <\/strong>Label(), BorderLayout.SOUTH);<\/code>
\n\/\/ Create a number formatter.<\/code>
\nmFormat = NumberFormat.getInstance();<\/code>
\nmFormat.setMaximumFractionDigits(1);<\/code>
\n\/\/ Listen for the frame rate changes.<\/code>
\nac.setRateListener(this<\/strong>);<\/code>
\n\/\/ Kick off the animation.<\/code>
\nThread t = new <\/strong>Thread(ac);<\/code>
\nt.start();<\/code>
\n}<\/code><\/p>\n

public void <\/strong>rateChanged(double <\/strong>frameRate) {<\/code>
\nmStatusLabel.setText(mFormat.format(frameRate) + \" fps\");<\/code>
\n}<\/code>
\n}<\/code><\/p>\n

 <\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

import java.awt.BasicStroke; import java.awt.BorderLayout; import java.awt.Checkbox; import java.awt.Color; import java.awt.Dimension; import java.awt.Font; import java.awt.Frame; import java.awt.GradientPaint; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Image; import java.awt.Label; import java.awt.Panel; import java.awt.RenderingHints; import java.awt.Shape; import java.awt.Stroke; import java.awt.event.ComponentAdapter; import java.awt.event.ComponentEvent; import java.awt.event.ItemEvent; import java.awt.event.ItemListener;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_layout":"default_layout","_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"ngg_post_thumbnail":0,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"Animation: bounce","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[3508,1079],"tags":[249,942,51],"class_list":["post-3611","post","type-post","status-publish","format-standard","hentry","category-programacao","category-tecnologia","tag-informatica","tag-java","tag-programacao"],"aioseo_notices":[],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_likes_enabled":true,"jetpack-related-posts":[{"id":3592,"url":"https:\/\/eliezerladeira.com.br\/blog\/noise-image\/","url_meta":{"origin":3611,"position":0},"title":"Noise Image","author":"admin","date":"","format":false,"excerpt":"import\u00a0java.awt.Graphics; import\u00a0java.awt.event.WindowAdapter; import\u00a0java.awt.event.WindowEvent; import\u00a0java.awt.image.BufferedImage; import\u00a0java.awt.image.ColorModel; import\u00a0java.awt.image.DataBuffer; import\u00a0java.awt.image.DataBufferByte; import\u00a0java.awt.image.IndexColorModel; import\u00a0java.awt.image.Raster; import\u00a0java.awt.image.WritableRaster; import\u00a0java.util.Random; import\u00a0javax.swing.JComponent; import\u00a0javax.swing.JFrame; public\u00a0class\u00a0StaticGenerator\u00a0extends\u00a0JComponent\u00a0implements\u00a0Runnable\u00a0{ byte[]\u00a0data; BufferedImage\u00a0image; Random\u00a0random; public\u00a0void\u00a0initialize()\u00a0{ int\u00a0w\u00a0=\u00a0getSize().width,\u00a0h\u00a0=\u00a0getSize().height; int\u00a0length\u00a0=\u00a0((w\u00a0+\u00a07)\u00a0*\u00a0h)\u00a0\/\u00a08; data\u00a0=\u00a0new\u00a0byte[length]; DataBuffer\u00a0db\u00a0=\u00a0new\u00a0DataBufferByte(data,\u00a0length); WritableRaster\u00a0wr\u00a0=\u00a0Raster.createPackedRaster(db,\u00a0w,\u00a0h,\u00a01,\u00a0null); ColorModel\u00a0cm\u00a0=\u00a0new\u00a0IndexColorModel(1,\u00a02,\u00a0new\u00a0byte[]\u00a0{\u00a0(byte)\u00a00,\u00a0(byte)\u00a0255\u00a0},\u00a0new\u00a0byte[]\u00a0{ (byte)\u00a00,\u00a0(byte)\u00a0255\u00a0},\u00a0new\u00a0byte[]\u00a0{\u00a0(byte)\u00a00,\u00a0(byte)\u00a0255\u00a0}); image\u00a0=\u00a0new\u00a0BufferedImage(cm,\u00a0wr,\u00a0false,\u00a0null); random\u00a0=\u00a0new\u00a0Random(); new\u00a0Thread(this).start(); } public\u00a0void\u00a0run()\u00a0{ while\u00a0(true)\u00a0{ random.nextBytes(data); repaint(); try\u00a0{ Thread.sleep(1000\u00a0\/\u00a024); }\u00a0catch\u00a0(InterruptedException\u00a0e)\u00a0{\u00a0\/*\u00a0die\u00a0*\/ } } } public\u00a0void\u00a0paint(Graphics\u00a0g)\u00a0{ if\u00a0(image\u00a0==\u00a0null) initialize(); g.drawImage(image,\u00a00,\u00a00,\u00a0this); } public\u00a0static\u00a0void\u00a0main(String[]\u00a0args)\u00a0{ JFrame\u00a0f\u00a0=\u00a0new\u00a0JFrame(); f.add(new\u00a0StaticGenerator()); f.setSize(300,\u00a0300); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.setVisible(true);\u2026","rel":"","context":"Em "Programa\u00e7\u00e3o"","block_context":{"text":"Programa\u00e7\u00e3o","link":"https:\/\/eliezerladeira.com.br\/blog\/category\/tecnologia\/programacao\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/netsysoft.wordpress.com\/wp-content\/uploads\/2010\/02\/staticgenerator.png?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":3583,"url":"https:\/\/eliezerladeira.com.br\/blog\/fade-out-de-uma-imagem-a-imagem-vai-ficando-transparente-gradualmente-ate-que-esteja-completamente-invisivel\/","url_meta":{"origin":3611,"position":1},"title":"Fade out de uma imagem: a imagem vai ficando transparente gradualmente at\u00e9 que esteja completamente\u00a0invis\u00edvel","author":"admin","date":"","format":false,"excerpt":"import\u00a0java.awt.AlphaComposite; import\u00a0java.awt.Graphics; import\u00a0java.awt.Graphics2D; import\u00a0java.awt.Image; import\u00a0java.awt.event.ActionEvent; import\u00a0java.awt.event.ActionListener; import\u00a0javax.swing.ImageIcon; import\u00a0javax.swing.JFrame; import\u00a0javax.swing.JPanel; import\u00a0javax.swing.Timer; public\u00a0class\u00a0FadeOutImage\u00a0extends\u00a0JPanel\u00a0implements\u00a0ActionListener\u00a0{ Image\u00a0myImage\u00a0=\u00a0new\u00a0ImageIcon(\"a.jpg\").getImage(); Timer\u00a0timer\u00a0=\u00a0new\u00a0Timer(20,\u00a0this); private\u00a0float\u00a0alpha\u00a0=\u00a01f; public\u00a0FadeOutImage()\u00a0{ timer.start(); } public\u00a0void\u00a0paint(Graphics\u00a0g)\u00a0{ super.paint(g); Graphics2D\u00a0g2d\u00a0=\u00a0(Graphics2D)\u00a0g; g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER,\u00a0alpha)); g2d.drawImage(myImage,\u00a010,\u00a010,\u00a0null); } public\u00a0void\u00a0actionPerformed(ActionEvent\u00a0e)\u00a0{ alpha\u00a0+=\u00a0-0.01f; if\u00a0(alpha\u00a0<=\u00a00)\u00a0{ alpha\u00a0=\u00a00; timer.stop(); } repaint(); } public\u00a0static\u00a0void\u00a0main(String[]\u00a0args)\u00a0{ JFrame\u00a0frame\u00a0=\u00a0new\u00a0JFrame(\"Fade\u00a0out\"); frame.add(new\u00a0FadeOutImage()); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(300,\u00a0250); frame.setVisible(true); } } \u00a0","rel":"","context":"Em "Programa\u00e7\u00e3o"","block_context":{"text":"Programa\u00e7\u00e3o","link":"https:\/\/eliezerladeira.com.br\/blog\/category\/tecnologia\/programacao\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":3585,"url":"https:\/\/eliezerladeira.com.br\/blog\/font-size-animation\/","url_meta":{"origin":3611,"position":2},"title":"Font size animation","author":"admin","date":"","format":false,"excerpt":"import\u00a0java.awt.Font; import\u00a0java.awt.FontMetrics; import\u00a0java.awt.Graphics; import\u00a0java.awt.Graphics2D; import\u00a0java.awt.event.ActionEvent; import\u00a0java.awt.event.ActionListener; import\u00a0javax.swing.JFrame; import\u00a0javax.swing.JPanel; import\u00a0javax.swing.Timer; public\u00a0class\u00a0FontSizeAnimation\u00a0extends\u00a0JPanel\u00a0implements\u00a0ActionListener\u00a0{ Timer\u00a0timer; int\u00a0x\u00a0=\u00a01; float\u00a0alpha\u00a0=\u00a01; public\u00a0FontSizeAnimation()\u00a0{ timer\u00a0=\u00a0new\u00a0Timer(8,\u00a0this); timer.setInitialDelay(190); timer.start(); } public\u00a0void\u00a0paint(Graphics\u00a0g)\u00a0{ super.paintComponent(g); Graphics2D\u00a0g2d\u00a0=\u00a0(Graphics2D)\u00a0g; Font\u00a0font\u00a0=\u00a0new\u00a0Font(\"Dialog\",\u00a0Font.PLAIN,\u00a0x); g2d.setFont(font); FontMetrics\u00a0fm\u00a0=\u00a0g2d.getFontMetrics(); String\u00a0s\u00a0=\u00a0\"Java\"; int\u00a0w\u00a0=\u00a0(int)\u00a0getSize().getWidth(); int\u00a0h\u00a0=\u00a0(int)\u00a0getSize().getHeight(); int\u00a0stringWidth\u00a0=\u00a0fm.stringWidth(s); g2d.drawString(s,\u00a0(w\u00a0-\u00a0stringWidth)\u00a0\/\u00a02,\u00a0h\u00a0\/\u00a02); } public\u00a0static\u00a0void\u00a0main(String[]\u00a0args)\u00a0{ JFrame\u00a0frame\u00a0=\u00a0new\u00a0JFrame(\"FontSizeAnimation\"); frame.add(new\u00a0FontSizeAnimation()); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(400,\u00a0300); frame.setLocationRelativeTo(null); frame.setVisible(true); } public\u00a0void\u00a0actionPerformed(ActionEvent\u00a0e)\u00a0{ x\u00a0+=\u00a01; alpha\u00a0-=\u00a00.0001; repaint(); } } \u00a0","rel":"","context":"Em "Programa\u00e7\u00e3o"","block_context":{"text":"Programa\u00e7\u00e3o","link":"https:\/\/eliezerladeira.com.br\/blog\/category\/tecnologia\/programacao\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":3581,"url":"https:\/\/eliezerladeira.com.br\/blog\/a-rotating-and-scaling-rectangle\/","url_meta":{"origin":3611,"position":3},"title":"A rotating and scaling\u00a0rectangle","author":"admin","date":"","format":false,"excerpt":"import\u00a0java.awt.Graphics; import\u00a0java.awt.Graphics2D; import\u00a0java.awt.Rectangle; import\u00a0java.awt.RenderingHints; import\u00a0java.awt.event.ActionEvent; import\u00a0java.awt.event.ActionListener; import\u00a0javax.swing.JFrame; import\u00a0javax.swing.JPanel; import\u00a0javax.swing.Timer; public\u00a0class\u00a0SwingTimerBasedAnimationScaleRotate\u00a0extends\u00a0JPanel\u00a0implements\u00a0ActionListener\u00a0{ Timer\u00a0timer; private\u00a0double\u00a0angle\u00a0=\u00a00; private\u00a0double\u00a0scale\u00a0=\u00a01; private\u00a0double\u00a0delta\u00a0=\u00a00.01; Rectangle.Float\u00a0r\u00a0=\u00a0new\u00a0Rectangle.Float(20,\u00a020,\u00a0200,\u00a0200); public\u00a0SwingTimerBasedAnimationScaleRotate()\u00a0{ timer\u00a0=\u00a0new\u00a0Timer(10,\u00a0this); timer.start(); } public\u00a0void\u00a0paint(Graphics\u00a0g)\u00a0{ int\u00a0h\u00a0=\u00a0getHeight(); int\u00a0w\u00a0=\u00a0getWidth(); Graphics2D\u00a0g2d\u00a0=\u00a0(Graphics2D)\u00a0g; g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,\u00a0RenderingHints.VALUE_ANTIALIAS_ON); g2d.setRenderingHint(RenderingHints.KEY_RENDERING,\u00a0RenderingHints.VALUE_RENDER_QUALITY); g2d.translate(w\u00a0\/\u00a02,\u00a0h\u00a0\/\u00a02); g2d.rotate(angle); g2d.scale(scale,\u00a0scale); g2d.fill(r); } public\u00a0static\u00a0void\u00a0main(String[]\u00a0args)\u00a0{ JFrame\u00a0frame\u00a0=\u00a0new\u00a0JFrame(\"Moving\u00a0star\"); frame.add(new\u00a0SwingTimerBasedAnimationScaleRotate()); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(420,\u00a0250); frame.setLocationRelativeTo(null); frame.setVisible(true); } public\u00a0void\u00a0actionPerformed(ActionEvent\u00a0e)\u00a0{ if\u00a0(scale\u00a0<\u00a00.01)\u00a0{ delta\u00a0=\u00a0-delta; }\u00a0else\u00a0if\u00a0(scale\u00a0>\u00a00.99)\u00a0{ delta\u00a0=\u00a0-delta; } scale\u00a0+=\u00a0delta; angle\u00a0+=\u00a00.01; repaint(); } } \u00a0","rel":"","context":"Em "Programa\u00e7\u00e3o"","block_context":{"text":"Programa\u00e7\u00e3o","link":"https:\/\/eliezerladeira.com.br\/blog\/category\/tecnologia\/programacao\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":3579,"url":"https:\/\/eliezerladeira.com.br\/blog\/timer-based-animation\/","url_meta":{"origin":3611,"position":4},"title":"Timer based animation","author":"admin","date":"","format":false,"excerpt":"import\u00a0java.awt.Color; import\u00a0java.awt.Dimension; import\u00a0java.awt.Graphics; import\u00a0java.awt.Graphics2D; import\u00a0java.awt.RenderingHints; import\u00a0java.awt.event.ActionEvent; import\u00a0java.awt.event.ActionListener; import\u00a0java.awt.geom.Ellipse2D; import\u00a0javax.swing.JFrame; import\u00a0javax.swing.JPanel; import\u00a0javax.swing.Timer; public\u00a0class\u00a0TimerBasedAnimation\u00a0extends\u00a0JPanel\u00a0implements\u00a0ActionListener\u00a0{ private\u00a0Ellipse2D.Float\u00a0ellipse\u00a0=\u00a0new\u00a0Ellipse2D.Float(); private\u00a0double\u00a0esize; private\u00a0double\u00a0maxSize\u00a0=\u00a00; private\u00a0boolean\u00a0initialize\u00a0=\u00a0true; Timer\u00a0timer; ActionListener\u00a0updateProBar; public\u00a0TimerBasedAnimation()\u00a0{ setXY(20\u00a0*\u00a0Math.random(),\u00a0200,\u00a0200); timer\u00a0=\u00a0new\u00a0Timer(20,\u00a0this); timer.setInitialDelay(190); timer.start(); } public\u00a0void\u00a0setXY(double\u00a0size,\u00a0int\u00a0w,\u00a0int\u00a0h)\u00a0{ esize\u00a0=\u00a0size; ellipse.setFrame(10,\u00a010,\u00a0size,\u00a0size); } public\u00a0void\u00a0reset(int\u00a0w,\u00a0int\u00a0h)\u00a0{ maxSize\u00a0=\u00a0w\u00a0\/\u00a010; setXY(maxSize\u00a0*\u00a0Math.random(),\u00a0w,\u00a0h); } public\u00a0void\u00a0step(int\u00a0w,\u00a0int\u00a0h)\u00a0{ esize++; if\u00a0(esize\u00a0>\u00a0maxSize)\u00a0{ setXY(1,\u00a0w,\u00a0h); }\u00a0else\u00a0{ ellipse.setFrame(ellipse.getX(),\u00a0ellipse.getY(),\u00a0esize,\u00a0esize); } } public\u00a0void\u00a0render(int\u00a0w,\u00a0int\u00a0h,\u00a0Graphics2D\u00a0g2)\u00a0{ g2.setColor(Color.BLUE); g2.draw(ellipse); } public\u00a0void\u00a0paint(Graphics\u00a0g)\u00a0{ super.paintComponent(g); Graphics2D\u00a0g2\u00a0=\u00a0(Graphics2D)\u00a0g; RenderingHints\u00a0rh\u00a0=\u00a0new\u00a0RenderingHints(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); rh.put(RenderingHints.KEY_RENDERING,\u00a0RenderingHints.VALUE_RENDER_QUALITY);\u2026","rel":"","context":"Em "Programa\u00e7\u00e3o"","block_context":{"text":"Programa\u00e7\u00e3o","link":"https:\/\/eliezerladeira.com.br\/blog\/category\/tecnologia\/programacao\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":3577,"url":"https:\/\/eliezerladeira.com.br\/blog\/is-event-dispatcher-thread\/","url_meta":{"origin":3611,"position":5},"title":"Is Event Dispatcher\u00a0Thread","author":"admin","date":"","format":false,"excerpt":"import\u00a0java.awt.Color; import\u00a0java.awt.Component; import\u00a0java.awt.Dimension; import\u00a0java.awt.event.ActionEvent; import\u00a0java.awt.event.ActionListener; import\u00a0java.util.Random; import\u00a0javax.swing.AbstractAction; import\u00a0javax.swing.ButtonGroup; import\u00a0javax.swing.JButton; import\u00a0javax.swing.JFrame; import\u00a0javax.swing.JLabel; import\u00a0javax.swing.JPanel; import\u00a0javax.swing.JRadioButton; import\u00a0javax.swing.JTable; import\u00a0javax.swing.SwingUtilities; import\u00a0javax.swing.table.AbstractTableModel; import\u00a0javax.swing.table.TableCellRenderer; public\u00a0class\u00a0IsEDTExample\u00a0extends\u00a0JPanel\u00a0{ private\u00a0boolean\u00a0keepRunning; private\u00a0static\u00a0int\u00a0RED\u00a0=\u00a00; private\u00a0static\u00a0int\u00a0BLUE\u00a0=\u00a01; private\u00a0static\u00a0int\u00a0GREEN\u00a0=\u00a02; private\u00a0static\u00a0int\u00a0VARIABLE\u00a0=\u00a03; private\u00a0static\u00a0int\u00a0SIZE\u00a0=\u00a03; private\u00a0int\u00a0threadShade; private\u00a0ColorTableModel\u00a0tableModel=\u00a0new\u00a0ColorTableModel(); private\u00a0Thread\u00a0colorShadeThread; public\u00a0IsEDTExample()\u00a0{ JTable\u00a0table\u00a0=\u00a0new\u00a0JTable(tableModel); table.setRowHeight(100); table.setDefaultRenderer(Object.class,\u00a0new\u00a0ColorRenderer()); add(table); add(new\u00a0JLabel(\"Thread\u00a0Color\u00a0Shade:\")); ButtonGroup\u00a0group\u00a0=\u00a0new\u00a0ButtonGroup(); JRadioButton\u00a0redOption\u00a0=\u00a0new\u00a0JRadioButton(\"Red\"); group.add(redOption); redOption.addActionListener(new\u00a0ActionListener()\u00a0{ public\u00a0void\u00a0actionPerformed(ActionEvent\u00a0e)\u00a0{ threadShade\u00a0=\u00a0RED; } }); JRadioButton\u00a0blueOption\u00a0=\u00a0new\u00a0JRadioButton(\"Blue\"); group.add(blueOption); blueOption.addActionListener(new\u00a0ActionListener()\u00a0{ public\u00a0void\u00a0actionPerformed(ActionEvent\u00a0e)\u00a0{ threadShade\u00a0=\u00a0BLUE; } }); JRadioButton\u00a0greenOption\u00a0=\u00a0new\u00a0JRadioButton(\"Green\"); group.add(greenOption);\u2026","rel":"","context":"Em "Programa\u00e7\u00e3o"","block_context":{"text":"Programa\u00e7\u00e3o","link":"https:\/\/eliezerladeira.com.br\/blog\/category\/tecnologia\/programacao\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]}],"_links":{"self":[{"href":"https:\/\/eliezerladeira.com.br\/blog\/wp-json\/wp\/v2\/posts\/3611","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/eliezerladeira.com.br\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/eliezerladeira.com.br\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/eliezerladeira.com.br\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/eliezerladeira.com.br\/blog\/wp-json\/wp\/v2\/comments?post=3611"}],"version-history":[{"count":1,"href":"https:\/\/eliezerladeira.com.br\/blog\/wp-json\/wp\/v2\/posts\/3611\/revisions"}],"predecessor-version":[{"id":3613,"href":"https:\/\/eliezerladeira.com.br\/blog\/wp-json\/wp\/v2\/posts\/3611\/revisions\/3613"}],"wp:attachment":[{"href":"https:\/\/eliezerladeira.com.br\/blog\/wp-json\/wp\/v2\/media?parent=3611"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/eliezerladeira.com.br\/blog\/wp-json\/wp\/v2\/categories?post=3611"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/eliezerladeira.com.br\/blog\/wp-json\/wp\/v2\/tags?post=3611"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}