Tham khảo tài liệu 'hacking roomba - tod part 7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 162 Part II Fun Things to Do MIDI-capable software and devices. When similar wrappers are created for other operating systems then RoombaMidi could be easily ported to those operating systems too. MIDI communication operates at essentially the device driver level requiring operating system support and making a 100 percent Java solution not possible. Since Mac OS X-specific Java libraries are required and a more standard GUI is desired it doesn t make as much sense to use Processing. Instead a standard technique of bundling Java JAR files into Mac OS X executables is used. This technique uses a free program that comes with Mac OS X called Jar Bundler. A similar free bundling tool exists for Windows called Launch4J http . Figure 8-5 shows what RoombaMidi looks like. At first glance it looks the same as Roomba CommTest with which you are already familiar. Like RoombaCommTest RoombaMidi uses RoombaCommPanel for the Roomba GUI. RoombaMidi works just like RoombaCommTest and adds only a thin application wrapper a MIDI parser and a tabbed pane to hold multiple RoombaCommPanels. Figure 8-6 shows RoombaMidi as part of a larger setup including Ableton Live a digital audio and MIDI workstation and MidiKeys a virtual MIDI keyboard. You can download free MIDI sequencers sometimes called hosts and other MIDI programs for Mac OS X at http . Another good resource for free music programs for all operating systems is . Figure 8-5 RoombaMidi running Chapter 8 Making Roomba Sing 163 Figure 8-6 RoombaMidi as part of a virtual studio Translating MIDI Notes into Roomba Actions One part of RoombaCommPanel not mentioned earlier is the playMidiNote method. It is shown in Listing 8-5. Structurally it is very similar to the keyPressed method of the Processing sketches in this and the previous chapter. The method accepts two parameters a MIDI note number and a note velocity. In MIDI note velocity is basically how loud the note should .
