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java Programming Glossary: piHow to increase/decrease brightness of image using JSlider in java? http://stackoverflow.com/questions/10208255/how-to-increase-decrease-brightness-of-image-using-jslider-in-java sense to alter a copy. Unfortunately your example merely copies a reference to the original. Instead use two copies passing.. copies a reference to the original. Instead use two copies passing the original as src and the copy as dst as shown the.. JSlider slider new JSlider public RescaleTest PlanarImage pi JAI.create fileload NAME image pi.getAsBufferedImage copy pi.getAsBufferedImage..
Most elegant way to generate prime numbers http://stackoverflow.com/questions/1042902/most-elegant-way-to-generate-prime-numbers I did it last night it didn't end up as nice as I was hoping. Here is what I came up with ArrayList generatePrimes int.. my actual question. To reiterate I wanted a nice clean piece of code that generated a list of prime numbers. I already.. primes share improve this question Use the estimate pi n n log n for the number of primes up to n to find a limit and..
http://stackoverflow.com/questions/1082437/android-alarmmanager i new Intent context OnAlarmReceiver.class PendingIntent pi PendingIntent.getBroadcast context 0 i 0 mgr.setRepeating AlarmManager.ELAPSED_REALTIME_WAKEUP.. SystemClock.elapsedRealtime PERIOD pi In this example I am using setRepeating . If you want a one..
Java Math.cos(Math.toRadians(<angle>)) returns weird values http://stackoverflow.com/questions/13100144/java-math-cosmath-toradiansangle-returns-weird-values trigonometry sin x ~ x for small values of x sin x cos x pi 2 Because pi 2 can't be represented exactly in IEEE 754 Floating.. sin x ~ x for small values of x sin x cos x pi 2 Because pi 2 can't be represented exactly in IEEE 754 Floating point it.. it must be off by some value x i.e it is represented by pi 2 x where x the least significant bit in the floating point..
What is the equivalent of Java's final in C#? http://stackoverflow.com/questions/1327544/what-is-the-equivalent-of-javas-final-in-c a variable to be assigned once Java public final double pi 3.14 essentially a constant C# public readonly double pi 3.14.. pi 3.14 essentially a constant C# public readonly double pi 3.14 essentially a constant As a side note the effect of the.. that the expression is evaluated at runtime rather than compile time hence allowing arbitrary expressions. share improve..
'Fill' Unicode characters in labels http://stackoverflow.com/questions/18686199/fill-unicode-characters-in-labels for the chess program I've recently programmed with chess pieces something like seen above . In it I'm using unicode characters.. . In it I'm using unicode characters to represent my chess pieces u2654 through u265F . The problem is as follows When I set.. is as follows When I set the background of my chess piece JLabel to something like white the entire label is filled..
Fast transcendent / trigonometric functions for Java http://stackoverflow.com/questions/523531/fast-transcendent-trigonometric-functions-for-java Otherwise there would be no point in it. For values over pi 4 Java does some expensive computations in addition to the hardware.. #include math.h #include stdio.h Return an approx to sin pi 2 x where 1 x 1. In that range it has a max absolute error of.. x2 .64596371106 x2 1.57079631847 x int main double pi 4 atan 1 printf .10f n xsin 0.77 printf .10f n sin 0.77 pi 2..
http://stackoverflow.com/questions/5877646/adding-a-point-to-polygon int index Point point MyPoly mp new MyPoly PathIterator pi this.getPathIterator null double coords new double 6 int i 0.. null double coords new double 6 int i 0 while pi.isDone if i index mp.addPoint point.x point.y else if pi.currentSegment.. if i index mp.addPoint point.x point.y else if pi.currentSegment coords PathIterator.SEG_CLOSE mp.addPoint int..
free Java library for evaluating math expressions http://stackoverflow.com/questions/7258538/free-java-library-for-evaluating-math-expressions where the user can provide in a formula for example sin x pi 2 1 which I use in my Java app The formula provided by the user.. formula provided by the user private String formula sin x pi 2 1 Evaluates the formula and computes the result by using the..
Swing method akin to HTML5's canvas.putImageData(arrayOfPixels, 0,0) http://stackoverflow.com/questions/7297950/swing-method-akin-to-html5s-canvas-putimagedataarrayofpixels-0-0 0 0 I have some Javascript code that acts on an pixel array defined like so screen 'width' 160 'height' 144 'data'.. private static final int H 30 private static List Integer pi new ArrayList Integer private final List Integer clut new ArrayList.. for int i 0 i s.length i pi.add s.charAt i '0' for int i 0 i 10 i clut.add Color.getHSBColor..
Covert latitude/longitude point to a pixels (x,y) on mercator projection http://stackoverflow.com/questions/14329691/covert-latitude-longitude-point-to-a-pixels-x-y-on-mercator-projection 85.05112878 double mapLatBottomDegree mapLatBottom Math.PI 180 double worldMapWidth mapWidth mapLonDelta 360 2 Math.PI.. 180 double worldMapWidth mapWidth mapLonDelta 360 2 Math.PI double mapOffsetY worldMapWidth 2 Math.log 1 Math.sin mapLatBottomDegree.. mapWidth mapLonDelta double y 0.1 if lat 0 lat lat Math.PI 180 y mapHeight worldMapWidth 2 Math.log 1 Math.sin lat 1 Math.sin..
Android color picker to be included in the activity http://stackoverflow.com/questions/16363235/android-color-picker-to-be-included-in-the-activity ir pinToByte ig pinToByte ib private static final float PI 3.1415926f @Override public boolean onTouchEvent MotionEvent.. angle float java.lang.Math.atan2 y x need to turn angle PI ... PI into unit 0....1 float unit angle 2 PI if unit 0 unit.. float java.lang.Math.atan2 y x need to turn angle PI ... PI into unit 0....1 float unit angle 2 PI if unit 0 unit 1 ..
how to pass parameter to a webservice using ksoap2? http://stackoverflow.com/questions/2108527/how-to-pass-parameter-to-a-webservice-using-ksoap2 request new SoapObject NAMESPACE METHOD_NAME PropertyInfo PI new PropertyInfo request.addProperty a myprop SoapSerializationEnvelope..
What is the use of interface constants? http://stackoverflow.com/questions/2659593/what-is-the-use-of-interface-constants implementation detail to leak into the class's exported API. It is of no consequence to the users of a class that the class.. restrict instantiation public static final double PI 3.14159 public static final double PLANCK_CONSTANT 6.62606896e.. static Constants.PLANCK_CONSTANT import static Constants.PI public class Calculations public double getReducedPlanckConstant..
Calculating the angle between the line defined by two points http://stackoverflow.com/questions/2676719/calculating-the-angle-between-the-line-defined-by-two-points and the horizontal axis double angle atan2 y2 y1 x2 x1 180 PI . I implemented this but I think the fact the I'm working in..
Converting a float into a string fraction representation http://stackoverflow.com/questions/5968636/converting-a-float-into-a-string-fraction-representation 1000 for int i 1 i 100000000 i 10 System.out.println PI i toFraction 3.1415926535897932385 i prints 1 1 3 1 1 7 PI.. i toFraction 3.1415926535897932385 i prints 1 1 3 1 1 7 PI 1 3 PI 10 3 1 7 PI 100 3 14 99 PI 1000 3 16 113 PI 10000 3 16.. 3.1415926535897932385 i prints 1 1 3 1 1 7 PI 1 3 PI 10 3 1 7 PI 100 3 14 99 PI 1000 3 16 113 PI 10000 3 16 113 PI..
Converting longitude/latitude to X/Y coordinate http://stackoverflow.com/questions/5983099/converting-longitude-latitude-to-x-y-coordinate to X Y coordinate I created a map using Google Maps API that highlights all Minnesota counties. Basically I created.. keynote slides. I couldn't find any useful Google Maps API that allows me to save my custom map the way it is if you know.. coordinate.getLongitude latitude latitude Math.PI 180 longitude longitude Math.PI 180 double x EARTH_RADIUS Math.sin..
JFreechart series tool tip above shape annotation http://stackoverflow.com/questions/6797012/jfreechart-series-tool-tip-above-shape-annotation stroke new BasicStroke 2.0f private static final double PI 180d private static final int X 8 private static final int Y.. line Arc2D.Double arc new Arc2D.Double X Y W 2 H PI PI Arc2D.OPEN plot.addAnnotation new XYShapeAnnotation arc stroke.. line Arc2D.Double arc new Arc2D.Double X Y W 2 H PI PI Arc2D.OPEN plot.addAnnotation new XYShapeAnnotation arc stroke..
Difference between a static and a final static variable in Java http://stackoverflow.com/questions/8005250/difference-between-a-static-and-a-final-static-variable-in-java constants class MyConstants public static final double PI 3.1415926535897932384626433 . There are many other subtle characteristics..
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