package triangle_projection; import java.io.*; import java.awt.*; public class Prim extends JComponent { public static int [][] Graph; public static int [][] Tree; public static int [] near; public static int n; public static int mincost = 0; public static int k, l; public Edge edges[] = new Edge[100]; public Main main = new Main(); public Graph graph; //create a minal spanning tree public static void prims() { getMinKL(); mincost = Graph[k][l]; Tree[1][1] = l; Tree[1][2] = k; for(int i=1; i<=n; i++) near[i] = (Graph[i][l]<Graph[i][k])?l:k; near[k] = near[l] = 0; for(int i=2; i<n; i++) { int j = getMin(); Tree[i][1] = j; Tree[i][2] = near[j]; mincost = mincost+Graph[j][near[j]]; near[j] =0; for (int k=1; k<=n; k++) if( (near[k] !=0) && Graph[k][ near[k] ]> Graph[k][j] ) near[k] =j; } } public int numofVer() { return n; } // return the total number of the node //get the original space distance of 2 points public int GetDis(int one, int two){ int dis = Graph[one][two]; return dis; } public static void main (String[] args) throws IOException { prims(); [COLOR="Red"]//main.createNode();[/COLOR] System.out.println("\n\nSolution : \n\n"); JFrame window = new JFrame(); window.setBounds(500, 500, 500, 500); window.setBackground(new Color(255,255,255)); window.getContentPane().add(new Graph()); window.setVisible(true); } }

package triangle_projection; public class Main { private int n=0; private Prim prim = new Prim(); public int Vertnum = prim.numofVer(); public Point pt = new Point(); public Graph graph = new Graph(); private Node One, Two; public void createNode() { //Random rand = new Random(); for (int j=1; j<=Vertnum; j++){ if (j == 1){ nodes[j] = new Node(0,0,j); } else if (j == 2){ int dis = prim.GetDis(1, 2); nodes[j] = new Node(dis,0,j); } else{ for (int i=1; i<=3; i++){ dist2[i] = prim.GetDis(i, j); } for (int i=1; i<=3; i++){ if((i!=j)&&(i<j)) { int x1 = pt.getx1(One, Two, dist2[2], dist2[3]); int y1 = pt.gety1(One, Two, dist2[2], dist2[3]); int x2 = pt.getx2(One, Two, dist2[2], dist2[3]); int y2 = pt.gety2(One, Two, dist2[2], dist2[3]); int n1 = graph.isNode(x1,y1); int n2 = graph.isNode(x2,y2); if ( n1 == -1){ if(x1 > 0 && y1 > 0){ nodes[i+2] = new Node(x1,y1,j); } } if ( n2 == -1){ if(x2 > 0 && y2 > 0){ nodes[i+2] = new Node(x2,y2,j); } } } } } } for (int l=1; l<=Vertnum; l++){ for (int d=1; d<=3; d++){ if((d!=l)&&(d<l)) { realDist(nodes[l], nodes[d]); } } } } } }

package triangle_projection; import java.awt.*; public class Graph extends Canvas{ .... /*public Graph(int maxx, int maxy) { mx = maxx; my = maxy; setSize(mx, my); ni=0; ei=0; nodes = new Node[Vertnum]; //create a Node array of size 9 edges2 = new Edge[Vertnum*(Vertnum-1)/2]; //create an Edge array of size 36 }*/ //paint method draws graphics on the screen and called implicitly public void paint(Graphics g) { for (int i=0;i < ei;i++) { Edge e = edges2[i]; /* draw an edge */ drawEdge(e.firstNode(), e.secondNode(), e.weight(), g); } for (int i=0;i < ni;i++) { Node n = nodes[i]; /* draw a node */ drawNode(n.xPos()-8, n.yPos()-8, n.no()+1, g); } } //drawNode method draws a node at the given coordinates and in given the color private void drawNode(int x, int y, int no, Graphics g) { g.fillOval(x, y, 17, 17); // draw an oval which is filled with the current color g.setColor(blue); // set current color to black g.drawOval(x, y, 16, 16); // draw an oval g.drawString(Integer.toString(no), x+5, y+13); // draw the node number } //drawEdge method draws an edge between the given points and in the given color private void drawEdge(Node first, Node second, int weight, Graphics g) { int hyp, x, y; int x1 = first.xPos(); int y1 = first.yPos(); int x2 = second.xPos(); int y2 = second.yPos(); x = x2 - x1; y = y2 - y1; hyp = (int) Math.sqrt(x*x + y*y); // calculate the distance between the given two point g.drawLine(x1, y1, x2, y2); // draw a line between the given points x1 = x1 + (int)((x/hyp)*(hyp/2)); // calculate the middle of the given two points y1 = y1 + (int)((y/hyp)*(hyp/2)); g.setColor(yellow); // set current color to yellow g.fillOval(x1-8, y1-8, 17, 17); if (weight < 10) g.drawString(Integer.toString(weight), x1-3, y1+5); // draw the edge weight else g.drawString(Integer.toString(weight), x1-6, y1+5); // draw the edge weight } //numOfNodes method return the number of nodes on the screen public int numOfNodes() { return ni; } }

How can i run the createNode() in Main.java, in the Prim. java?? The error is Non-static variable cannot be reference on static content. So what can i change to make it work?

Also, the Prim.java is also not showing the jframe which is connected to Graph.java....

Can anyone please help??

Thank you