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| public class OscilloscopeExemple extends Canvas {
private static final int BUFFER_SIZE = 1000;
private static final Color MAIN_GRID_COLOR = Color.WHITE;
private static final Color SECONDARY_GRID_COLOR = Color.GRAY;
private static final int HORIZONTAL_GRID_DIVISION_NUMBER = 10;
private static final int VERTICAL_GRID_DIVISION_NUMBER = 10;
private static final Color SIGNAL_COLOR = Color.RED;
private FunctionThread thread;
private final BackgroundGrid grid;
private double[] buffer;
private int next;
private volatile boolean bufferFilled;
private final AtomicLong lastInput;
private int lastWidth;
private int lastHeight;
private BufferStrategy buffereStrategy;
private float scalex;
private float scaley;
private double adaptedScalex;
private final IFuntion function;
private int midy;
private final int updateRate;
private Timer timer;
public OscilloscopeExemple(int bufferSize, float scalex, float scaley, IFuntion function) {
this(bufferSize, scalex, scaley, function, -1);
}
/**
*
* @param bufferSize nombre de mesures conservées
* @param scalex facteur d'échelle x
* @param scaley facteur d'échelle y
* @param function function de signal
* @param fps frame rate (si <0, on dessine en RT, sinon on dessin à intervalle régulier)
*/
public OscilloscopeExemple(int bufferSize, float scalex, float scaley, IFuntion function, int fps) {
this.function = function;
buffer = new double[bufferSize];
next = 0;
bufferFilled = false;
lastInput = new AtomicLong();
grid = new BackgroundGrid(MAIN_GRID_COLOR, SECONDARY_GRID_COLOR,
HORIZONTAL_GRID_DIVISION_NUMBER, VERTICAL_GRID_DIVISION_NUMBER);
lastWidth = lastHeight = -1;
this.scalex=scalex;
this.scaley=scaley;
if ( fps<=0 ) {
updateRate=-1;
}
else {
updateRate = 1000/fps;
}
setIgnoreRepaint(true);
addComponentListener(new ComponentAdapter() {
@Override
public void componentResized(ComponentEvent e) {
initOrReset();
}
});
}
private synchronized void initOrReset() {
final int width = getWidth();
final int height = getHeight();
if (lastWidth != width || lastHeight != height) {
grid.setSize(width, height);
midy = height >> 1;
adaptedScalex = (scalex * width)/buffer.length;
}
}
public void setScaleX(float scalex) {
this.scalex=scalex;
adaptedScalex = (scalex * getWidth())/buffer.length;
draw();
}
public void setScaleY(float scaley) {
this.scaley=scaley;
draw();
}
public synchronized void start() {
if (thread == null) {
initOrReset();
createBufferStrategy(2);
buffereStrategy = getBufferStrategy();
thread = new FunctionThread();
thread.start();
if ( updateRate>0 ) {
timer = new Timer();
timer.scheduleAtFixedRate(new TimerTask() {
@Override
public void run() {
draw();
}
}, updateRate, updateRate);
}
}
}
public synchronized void stop() {
if (thread != null) {
thread.stopThread();
thread = null;
buffereStrategy.dispose();
buffereStrategy=null;
if ( timer!=null ) {
timer.cancel();
}
}
}
private void draw() {
if ( buffereStrategy==null ) return;
Graphics2D grBuffer = (Graphics2D) buffereStrategy.getDrawGraphics();
grBuffer.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
grBuffer.drawImage(grid.getImage(), 0, 0, null);
synchronized (this) {
grBuffer.setColor(SIGNAL_COLOR);
if ( bufferFilled ) {
double prevx=0;
int prevy=0;
for(int i=next; i<buffer.length; i++) {
if ( i==0 ) {
prevx = 0;
prevy = (int)(midy + buffer[i]*scaley);
}
else {
double x = prevx+adaptedScalex;
int y = (int)(midy + buffer[i]*scaley);
grBuffer.drawLine( (int)prevx, prevy, (int)x, y);
prevx = x;
prevy = y;
}
}
for(int i=0; i<next; i++) {
double x = prevx+adaptedScalex;
int y = (int)(midy + buffer[i]*scaley);
grBuffer.drawLine( (int)prevx, prevy, (int)x, y);
prevx = x;
prevy = y;
}
}
else {
double prevx=0;
int prevy=0;
for(int i=0; i<next; i++) {
if ( i==0 ) {
prevx = 0;
prevy = (int)(midy + buffer[i]*scaley);
}
else {
double x = prevx+adaptedScalex;
int y = (int)(midy + buffer[i]*scaley);
grBuffer.drawLine( (int)prevx, prevy, (int)x, y);
prevx = x;
prevy = y;
}
}
}
}
grBuffer.dispose();
buffereStrategy.show();
}
@Override
public void paint(Graphics g) {
// ne fait rien
}
@Override
public void paintAll(Graphics g) {
// ne fait rien
}
public void updateFunction(long newValue) {
if (lastInput.compareAndSet(lastInput.longValue(), newValue)) {
synchronized (this) {
buffer[next++] = this.function.getValue(newValue);
if (next == buffer.length) {
next = 0;
bufferFilled = true;
}
}
if ( timer==null ) draw();
}
}
private class FunctionThread extends Thread {
private volatile boolean running = true;
@Override
public void run() {
while (running) {
updateFunction(System.currentTimeMillis());
}
}
public void stopThread() {
running = false;
}
}
@FunctionalInterface
public interface IFuntion {
double getValue(long t);
}
// *************************** METHODES DE TEST ***************************
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> run());
}
public static void run() {
//System.setProperty("sun.java2d.transaccel", "True");
// System.setProperty("sun.java2d.ddforcevram", "True");
JFrame frame = new JFrame("Démo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
OscilloscopeExemple panel = new OscilloscopeExemple(BUFFER_SIZE, 1, 1, (t)-> Math.sin(t/30d) * 100 );
frame.getContentPane().add(panel);
frame.setSize(300, 300);
frame.setLocationRelativeTo(null);
frame.addWindowListener(new WindowAdapter() {
@Override
public void windowOpened(WindowEvent e) {
panel.start();
}
@Override
public void windowClosed(WindowEvent e) {
panel.stop();
}
});
frame.setVisible(true);
}
// ************************************************************************************
} |
