(Solved) BufferedBitmap: Minimal working example? (SDK: 4.0.10)

Have you looked at the Analog sample in the SDK?

createBuffered bitmap is only for devices with CIQ 4.x.  What target are you using?

Thanks for the suggestion, but the Analog example is definitely broken w/r/t SDK 4.x.  I am trying to build for an Epix Gen 2.

The Analog example is (essentially) this:

//************************************************************
// Attempt #3:
function onUpdate(dc as Dc) as Void {
    var buffer = new Graphics.BufferedBitmap({:width=>dc.getWidth(), :height=>dc.getHeight()});
    buffer = buffer.getDc();
    buffer.setColor(Graphics.COLOR_BLACK, Graphics.COLOR_BLACK);
    buffer.clear();
}
// Error: Symbol Not Found Error
// Details: Failed invoking <symbol>
// (Error occurs on line 4, but ignoring that it would break on line 5 also: getDc() does not exist!

line 4 should use creaetBufferedBitmap() on 4.x devices and then you want

buffer=buffer.get();

Without that you have a graphics pool reference to the buffered bitmap and not the buffered bitmap.

That's Attempt #2 above... doesn't work

Error: Unhandled Exception
Exception: UnexpectedTypeException: Expected Number/Float/Boolean/Long/Double, given Method

The error is stemming from buffer = buffer.get();

SDK 4.0.10, build target is Epix Gen2.

Ugh, there was a stupid mistake in my code. In the original version it reads

:width => dc.getWidth, :height => dc.getHeight

It should be:

:width => dc.getWidth(), :height => dc.getHeight()

From there things work as you suggested. Thanks so much!

Keep an eye on "New and Announcements"

Here for example is a whole post about graphics on CIQ 4 devices:

https://forums.garmin.com/developer/connect-iq/b/news-announcements/posts/a-whole-new-world-of-graphics-with-connect-iq-4

There are others, like for System 5 devices.

The get() here has to to with the Graphics pool.  With the graphics pool, some things are loaded there vs in your app's memory, and what your app sees is a reference to the object in the graphics pool instead of the object 

Thanks for your code above. For those who are going to try and do this moving forward, I thought I would do a simple copy and paste between the old analog code and the new. Everything else stays the same.

Old Code:

offscreenBuffer = new Graphics.BufferedBitmap({
:width=>dc.getWidth(),
:height=>dc.getHeight(),
:palette=> [
Graphics.COLOR_DK_GRAY,
Graphics.COLOR_LT_GRAY,
Graphics.COLOR_BLACK,
Graphics.COLOR_WHITE
]
});

// Allocate a buffer tall enough to draw the date into the full width of the
// screen. This buffer is also used for blanking the second hand. This full
// color buffer is needed because anti-aliased fonts cannot be drawn into
// a buffer with a reduced color palette

dateBuffer = new Graphics.BufferedBitmap({
:width=>dc.getWidth(),
:height=>Graphics.getFontHeight(Graphics.FONT_MEDIUM)
});

New Code:

            offscreenBuffer = Graphics.createBufferedBitmap({

One other thing: It seems with using the new createBufferedBitmap call, the native text graphics are lacking pixels... I had to use resource fonts to get numbers that were readable... see the below picture. The numbers in the upper half that are loaded into the buffer are from fonts I created. The numbers in the lower half of the WF [calories, active minutes and heart rate] are from internal graphics (i.e. 

dc.drawText(x-100, y+28 , Graphics.FONT_XTINY, calories, Graphics.TEXT_JUSTIFY_CENTER);

And seem to be missing pixels...any thoughts?