/**
* Display a single word statically on the display. In order to display the string correctly it
* should be about 6 characters or less, otherwise the string will not display completely before
* you start moving in the opposite direction. In these cases, some characters may display
* backwards.
*
* @param string The string to display
* @param count how many swings to display it
*/
public void swingThis(String string, int count) {
int i = 0;
double threshold = 1.0;
try {
while (i < count) {
// wait for motion
double acceleration = accelerometer.getAccelY();
// System.out.println("accelerometer =" + acceleration +
// " range = " + range );
if (acceleration > threshold) {
// we have acceleration right motion
while (acceleration > threshold) {
Thread.sleep(10);
acceleration = accelerometer.getAccelY();
}
displayStringForward(string);
i++;
// System.out.println("time = " + (now-start) +
// "fwadjust = " + forwardAdjust + ", Target = " + period);
} else if (acceleration < -threshold) {
// we have motion to the left
while (acceleration < -threshold) {
Thread.sleep(10);
acceleration = accelerometer.getAccelY();
}
displayStringBackward(string);
i++;
}
Thread.yield(); // so the SpotMonitor thread won't starve
}
} catch (IOException ex) {
ex.printStackTrace();
} catch (InterruptedException ex) {
ex.printStackTrace();
}
}
/**
* Scroll a string across the swinging display
*
* @param string The string to display
* @param scrollrate The speed to scroll at. To be readable, this should be a value from 1 to 10.
*/
public void scroll(String string, int scrollrate) {
long start = System.currentTimeMillis();
long left = start;
long right = start;
int overhead = 140; // The magic values of overhead and gap
int gap = 170; // were set empirically
int i, j, offset = overhead;
int len = string.length();
int mapSize = 0;
int[] bitmap;
boolean lefting = false; // debug
System.out.println("start scrolling " + string);
// find the length of the bitmap
for (i = 0; i < len; i++) {
mapSize += (font.getCharWidth(string.charAt(i))) + 1;
}
// create a custom length array to hold the bitmap
bitmap = new int[mapSize + (2 * overhead)];
for (i = 0; i < bitmap.length; i++) bitmap[i] = 0;
// preload the bitmap for the whole string
// this is probably a bad idea memory-wse, but I'm in a hurry
for (i = 0; i < len; i++) {
int[] character = font.getChar(string.charAt(i));
for (j = 0; j < character.length; j++) {
bitmap[offset++] = character[j];
}
bitmap[offset++] = 0;
}
System.out.println("bitmap inited");
offset = overhead - (gap - overhead);
double threshold = 1.0;
try {
while (offset < bitmap.length - gap) {
// wait for motion
double acceleration = accelerometer.getAccelY();
if (acceleration > threshold) {
while (acceleration > threshold) {
Thread.sleep(10);
acceleration = accelerometer.getAccelY();
}
bltBitmapForward(bitmap, offset, gap - overhead);
offset += scrollrate;
} else if (acceleration < -threshold) {
while (acceleration < -threshold) {
Thread.sleep(10);
acceleration = accelerometer.getAccelY();
}
bltBitmapBackward(bitmap, offset, gap - overhead);
offset += scrollrate;
}
try {
Thread.sleep(100);
} catch (InterruptedException ex) {
ex.printStackTrace();
}
}
System.out.println(" finished scrolling " + gap);
} catch (IOException ex) {
ex.printStackTrace();
} catch (InterruptedException ex) {
ex.printStackTrace();
}
}