For example, to draw a PDF document reference by ‘document’:

// allocate pixels
unsigned char* pixels = new unsigned char[thumb_height*thumb_width*4];

// create context
CGContextRef context = CGBitmapContextCreate(pixels, thumb_width, thumb_height, 8, 4*thumb_width, CGColorSpaceCreateWithName( kCGColorSpaceGenericRGB ), kCGImageAlphaNoneSkipLast );

// clear
memset( pixels, 255, thumb_width*thumb_height*4 );

// render page 1 into the pixels array
CGPDFPageRef page = CGPDFDocumentGetPage( document, 1 );
CGContextDrawPDFPage( context, page );

(For some reason I just wasn’t able to create any kind of RGBA context with CGBitmapContextCreate() – I always had to use the skip-alpha enum. Weird.)

(echo plot \"-\" with lines; cat numbers.txt) | gnuplot

numbers.txt is a list of numbers, with or without terminating semicolons. Scientific notation is ok.

(30 minutes later) … and, here’s how to write a pdf graph of each text file in the current directory:

ls *.txt | perl -e 'while(<stdin>) { chomp; system "(echo set term pdf; echo set yrange [-1:1]; echo plot \\\"-\\\" with lines; cat $_ ) | gnuplot > $_.pdf"; }

(and so I don’t lose it, here’s how to generate a whole bunch of testunits:

perl -e 'for ( $i=1; $i<60; $i+=5 ) { for ( $j=$i+1; $j<150; $j*=1.5 ) { print "#X obj ".($i*40)." ".(int($j))." testunit $i-".(int($j))." $i ".(int($j))." senergy;\n"; } } ' > 1.actions/testunits.pd.txt

)

	short fRefNumOut;
	FSRef output_file;

	NavDialogCreationOptions options;
	NavGetDefaultDialogCreationOptions( &options );
	options.modality = kWindowModalityAppModal;

	NavDialogRef dialog;
	err = NavCreatePutFileDialog ( &options, "Midi", 'MIDI', NULL, NULL, &dialog);
	printf("NavCreatePutFileDialog returned %i\n", err );

	err = NavDialogRun( dialog );
	printf("NavDialogRun returned %i\n", err );

	NavUserAction action;
	action = NavDialogGetUserAction( dialog );
	printf("got action %i\n");
	if (action == kNavUserActionNone || action == kNavUserActionCancel) {
		return 2;
	}

	// get dialog reply
	NavReplyRecord reply;
	err = NavDialogGetReply(dialog, &reply);
	if ( err != noErr )
		return 2;

	if ( reply.replacing )
	{
		printf("need to replace\n");
	}

	AEKeyword keyword;
	DescType actual_type;
	Size actual_size;
	FSRef output_dir;
	err = AEGetNthPtr(&(reply.selection), 1, typeFSRef, &keyword, &actual_type,
						  &output_dir, sizeof(output_file), &actual_size);

	printf("AEGetNthPtr returned %i\n", err );

	UInt8 output_dir_name[1024];
	FSRefMakePath(&output_dir, output_dir_name, 1024 );
	printf("got %s\n", output_dir_name );

	// now get filename
	CFIndex len = CFStringGetLength(reply.saveFileName);
	if (len > 255)
		len = 255;
	UniChar output_filename[255];
	CFStringGetCharacters(reply.saveFileName, CFRangeMake(0, len), output_filename);

	// need to unlink the old file
	if ( reply.replacing )
	{
		FSRef oldfile;

		err = FSMakeFSRefUnicode(&output_dir, len, output_filename,
								kTextEncodingUnicodeDefault,
								&oldfile);
		if (err == noErr)
			err = FSDeleteObject(&oldfile);
		if (err != noErr)
		{
			printf( "error %d erasing old file\n", err );
			return 2;
		}
	}

	err = FSCreateFileUnicode( &output_dir, len, output_filename, kFSCatInfoNone,
							   NULL, &output_file, NULL );

	if ( err != noErr )
	{
		fprintf( stderr, "error %i creating file\n", err );
		return 2;
	}

	// cleanup dialog
	NavDialogDispose(dialog);

	HFSUniStr255 data_fork;
	FSGetDataForkName( &data_fork );
	err = FSOpenFork(&output_file,data_fork.length, data_fork.unicode,fsWrPerm,&fRefNumOut);
	if ( err != noErr )
	{
		fprintf( stderr, "error %i opening data fork for writing\n", err );
		return 2;
	}

	char* buf = "hello";
	long bytes_written;
	FSWriteFork( &fRefNumOut, fsAtMark, 0, strlen(buf), buf, &bytes_written );

	FSCloseFork( &fRefNumOut );

(higher quality video here)

NPN
BC546, BC547, BC 548
2N3904, 2N2222

just because i couldn’t find it anywhere else

enjoy.

I have been called in to help write some Pure Data patches for this project. The patches need to run with PDa on a Gumstix computer.

The presentation was built using something I found called S5 which calls itself A Simple Standards-Based Slide Show System. It’s basically the entire functionality of PowerPoint in a single HTML file, with CSS to control the look and JavaScript to handle the navigation. Very, very nice. Have a look at my Dorkbot Valencia presentation for a demo…