In the notation language section we learned how to craft a score using a domain specific language (DSL) and how to extend it using groovy with custom transformations. However, behind the curtains, the mirchord interpreter uses a rich set of music software components to build the score.
Now we are going to see how to create a score using these raw components.

This section requires a basic knowledge of the Groovy programming language (or Java since most Java code is also valid Groovy code)

Let's start with the most basic object type, a simple Pitch

def pitch = new Pitch('C',4,0)  // symbol, octave, alteration
int midiKey = pitch.getMidiValue()
double hertz = 440f * Math.pow(2, (midiKey - 69) / 12f)

println "Pitch " + pitch + " with midiKey " + midiKey + " hertz " + hertz

should print to the console

Pitch C4[60] with midiKey 60 hertz 261.62558

As you guess every kind of musical entity presented in the notation language has a counterpart in the object model so you can create an entire score in the stardard imperative paradigm. However, even if this is a viable option, a more straightforward manner to create a score with the object model is to use a special groovy builder named ScoreBuilder.

// first measures of "Fra Martino"
def f4 = fr(1,4)
def f2 = fr(1,2)
def f1 = fr(1,1)
def fra_martino = new ScoreBuilder().score() {
	part(id:"1") {
		voice(id:"1") {
			clef(type:ClefType.TREBLE)
			key(fifths:0, mode:KeyMode.MAJOR)
			time(time:fr(4,4))
			tempo(baseBeat:fr(1,4), bpm:90)
			(1..2).each {
				chord(midiPitch:60, duration:f4)
				chord(midiPitch:62, duration:f4)
				chord(midiPitch:64, duration:f4)
				chord(midiPitch:60, duration:f4)
			}
			instrument(id:"Violin 1", program:41)
			(1..2).each {
				chord(midiPitch:64, duration:f4)
				chord(midiPitch:65, duration:f4)
				chord(midiPitch:67, duration:f2)
			}
		}
	}
}

def midiFile = projectPath.resolve('midi/FraMartino.mid').toFile()
saveAs(fra_martino, midiFile)

In the example above after the score creation we saved it in a MIDI file.

Coming soon...

Coming soon...