Nama : Vinsensius Yuda Pratama NRP : 05111740000156 kelas : PBO B Membuat pemandangan dengan Blue J dengan class : picture canvas segitiga kotak lingkaran Source code canvas import javax.swing.*; import java.awt.*; import java.util.List; import java.util.*; /** * Membuat canvas * * @author (Vinsensius Yuda Pratama) * */ public class Canvas { // Note: The implementation of this class (specifically the handling of // shape identity and colors) is slightly more complex than necessary. This // is done on purpose to keep the interface and instance fields of the // shape objects in this project clean and simple for educational purposes. private static Canvas canvasSingleton; /** * Factory method to get the canvas singleton object. */ public static Canvas getCanvas() { if(canvasSingleton == null) { canvasSingleton = new Canvas(...