Lightning Launcher

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====== About the script ======
  * Purpose : demonstrate the use of the Canvas APIs together with direct handling of touch events
  * Author : Pierre Hébert
  * Link: [[http://www.pierrox.net/android/applications/lightning_launcher/script/reference/net/pierrox/lightning_launcher/script/api/Image.html|Images and canvas APIs]], [[http://www.pierrox.net/android/applications/lightning_launcher/help/topic.php?id=160|Use of touch events]]
  * Requires LL v10.4b3

====== How to use the script ======

Copy paste the code below in a new script, check "menu item". Come back on a desktop, pick some random shortcut, enlarge it so that there is room to draw, and set its touch event to the newly created script (customize / more / tab +)

====== Script code ======
<sxh javascript;>
var x = event.getX();
var y = event.getY();
switch(event.getAction()) {
case MotionEvent.ACTION_DOWN:
  prev_x = x;
  prev_y = y;
  hue = 0;
  paint = new Paint(Paint.ANTI_ALIAS_FLAG);
  paint.setStrokeWidth(5);
  paint.setStrokeJoin(Paint.Join.ROUND);
  image = item.getBoxBackground("n");
  if(image == null) {
    image = LL.createImage(512, 512);
    item.setBoxBackground(image, "n");
  }
  canvas = image.draw();
  canvas.scale( image.getWidth() / item.getWidth(), image.getHeight() / item.getHeight());
  canvas.drawARGB(255,255,255,255);
  break;

case MotionEvent.ACTION_MOVE:
  hue += 10;
  hue = hue % 360;
  var c = Color.HSVToColor([hue, 1, 1]);
  paint.setColor(c);
  canvas.drawLine(prev_x, prev_y, x, y, paint);
  prev_x = x;
  prev_y = y;
  image.update();
  break;

case MotionEvent.ACTION_UP:
  image.save();
  paint = null;
  canvas = null;
  break;
}

return true;
</sxh>
Lightning Launcher

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