| Methods Summary |
|---|
| protected void | calculateFrameRate()
// Measure the frame rate
long now = System.currentTimeMillis();
int numberOfFrames = mPreviousTimes.length;
double newRate;
// Use the more stable method if a history is available.
if (mPreviousFilled)
newRate = (double)numberOfFrames /
(double)(now - mPreviousTimes[mPreviousIndex]) *
1000.0;
else
newRate = 1000.0 /
(double)(now - mPreviousTimes[numberOfFrames - 1]);
firePropertyChange("frameRate", mFrameRate, newRate);
mFrameRate = newRate;
// Update the history.
mPreviousTimes[mPreviousIndex] = now;
mPreviousIndex++;
if (mPreviousIndex >= numberOfFrames) {
mPreviousIndex = 0;
mPreviousFilled = true;
}
|
| protected boolean | checkImage(java.awt.Dimension d)
if (d.width == 0 || d.height == 0) return false;
if (mImage == null || mImage.getWidth(null) != d.width
|| mImage.getHeight(null) != d.height) {
mImage = createImage(d.width, d.height);
}
return true;
|
| protected void | firePropertyChange(java.lang.String name, double oldValue, double newValue)
mRateListener.rateChanged(newValue);
|
| public double | getFrameRate() return mFrameRate;
|
| protected void | render()
Graphics g = getGraphics();
if (g != null) {
Dimension d = getSize();
if (checkImage(d)) {
Graphics imageGraphics = mImage.getGraphics();
// Clear the image background.
imageGraphics.setColor(getBackground());
imageGraphics.fillRect(0, 0, d.width, d.height);
imageGraphics.setColor(getForeground());
// Draw this component offscreen.
paint(imageGraphics);
// Now put the offscreen image on the screen.
g.drawImage(mImage, 0, 0, null);
// Clean up.
imageGraphics.dispose();
}
g.dispose();
}
|
| public void | run()
while (mTrucking) {
render();
timeStep();
calculateFrameRate();
}
|
| public void | setRateListener(AnimationFrame af)
mRateListener = af;
|
| public abstract void | timeStep()
|
