Graphics

[espruino-discuss]

Posted at 2016-02-27 by MrTimcakes

I'm assuming that the Graphics library isn't included in the build for ESP8266 both from this post by @MaBecker and my own testing with an ESP-12 and it returning "Uncaught ReferenceError: "Graphics" is not defined". Perhaps this should be documented on the Espruino on ESP8266 docs page.

If anyone does get a build working with graphics I'd love to know. I'm trying to fit a power supply, ESP8266 and SSD1306 (or some other display) into a light switch in a wall for monitoring server temps and usage, I'm not sure if I can fit one of my original Espruinos in there too.

[espruino-discuss]

Posted at 2016-02-27 by @MaBecker

@ducky you can have Graphics, but with 1000 instead of 1400 vars and even without fonts in flash

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Posted at 2016-02-29 by @gfwilliams

Since it's JS, you can also fake it:

var Graphics = { createArrayBuffer : function(x,y,bpp,flags) {
  return { buffer : new ArrayBuffer(x*y*bpp >> 3); }
}};

... or something like that. Obviously you don't get any graphics functions but if you're happy poking bits and just want to use the existing drivers, that could be an option.

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Posted at 2016-03-08 by Hasse

That is alright for a start.
So, if I want to print "X" on my OLED for example. How do I continue with your code?
Will it stay on screen, or do I have to print it over and over?

Is this "problem" also for "ILI9163 LCD CONTROLLER" and others?

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Posted at 2016-03-09 by @gfwilliams

You would have to set the correct bits up in the arraybuffer g.buffer. Maybe:

var Graphics = { createArrayBuffer : function(x,y,bpp,flags) {
  return { buffer : new ArrayBuffer(x*y*bpp >> 3); }
}};
var g = require(lcd).connect...;
var a = new Uint8Array(g.buffer);
a[0] = 0b01000010;
a[1] = 0b00100100;
a[2] = 0b00011000;
a[3] = 0b00100100;
a[4] = 0b01000010;
g.flip();

There is no way to 'just' draw text at the moment on ESP8266.

If you used a proper Espruino board you wouldn't have that problem as there's a Graphics class with lines, text, etc built-in.

But until someone manages to compile that into ESP8266 you're out of luck.