Lightning Launcher

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====== Purpose ======
Scripts are able to manipulate icons and backgrounds in Lightning Launcher. It means that it is possible to generate some arbitrary content and display it as a shortcut icon, as an item background or as a folder window background.

====== How ======
The [[http://www.pierrox.net/android/applications/lightning_launcher/script/reference/net/pierrox/lightning_launcher/script/api/Image.html|Image]] class is the entry point. Such an Image can be retrieved through [[http://www.pierrox.net/android/applications/lightning_launcher/script/reference/net/pierrox/lightning_launcher/script/api/Shortcut.html#getImage%28%29|Shortcut.getImage]] or [[http://www.pierrox.net/android/applications/lightning_launcher/script/reference/net/pierrox/lightning_launcher/script/api/Item.html#getBoxBackground%28java.lang.String%29|Item.getBoxBackground]], or [[http://www.pierrox.net/android/applications/lightning_launcher/script/reference/net/pierrox/lightning_launcher/script/api/Folder.html#getWindowBackground%28%29|Folder.getWindowBackground]] for instance.

Call the draw method on Image to obtain a Canvas object. The canvas is an android object (http://developer.android.com/reference/android/graphics/Paint.html) used to issue drawing operations on the Image.

The canvas object offers a number of methods to draw lines, curves, path, bitmaps, gradients and text. This drawing tool is used system wide to draw the UI.
 
Use the [[http://developer.android.com/reference/android/graphics/Path.html|Path]] object to draw complex shapes. 

Use [[http://www.pierrox.net/android/applications/lightning_launcher/script/reference/net/pierrox/lightning_launcher/script/api/Image.html#getBitmap%28%29|Image.getBitmap]] to access the Android object in [[http://developer.android.com/reference/android/graphics/Canvas.html#drawBitmap%28android.graphics.Bitmap,%20float,%20float,%20android.graphics.Paint%29|Canvas.drawBitmap]].


Once drawing is done, call Image.update() to refresh the screen, or save() to persist the image to file (when appropriate).

====== Samples ======

===== Copy an icon from an item to another item =====
<code>
var i = LL.getCurrentDesktop().getItemByLabel("some item").getDefaultIcon();
LL.getEvent().getItem().setDefaultIcon(i);
</code>

===== Paint a diagonal line over a coloured background =====
<code>
// retrieve the image for the clicked item
var i = LL.getEvent().getItem().getImage();

// create a paint object
var p = new Paint();
p.setAntiAlias(true);
p.setStrokeWidth(10);

// retrieve the canvas
var c = i.draw();
// fill with red
c.drawARGB(255,255,0,0);

// draw a line (10px thick, with antialiasing on)
c.drawLine(0,0, i.getWidth(), i.getHeight(), p);

// update so that changes are flipped to the screen
i.update();
</code>

===== Draw the folder window background with a gradient =====
<code>
var WIDTH = 512;
var HEIGHT = 512;

var i = LL.createImage(WIDTH,HEIGHT);
LL.getOpenFolders().getAt(0).setBackground(i);
var c = i.draw();
var g = new LinearGradient(0,0,WIDTH,HEIGHT,[0xff000000,0,0xffffffff],[0,0.5,1],Shader.TileMode.REPEAT);

var p = new Paint();
p.setStyle(Paint.Style.FILL);
p.setShader(g);
c.drawRect(0,0,WIDTH,HEIGHT,p);
i.update();
</code>
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