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package com.c2kernel.graph.view;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Paint;
import java.awt.Point;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.Observable;
import java.util.Observer;
import javax.swing.JPanel;
import com.c2kernel.graph.event.EntireModelChangedEvent;
import com.c2kernel.graph.event.GraphModelResizedEvent;
import com.c2kernel.graph.model.DirectedEdge;
import com.c2kernel.graph.model.ElasticBand;
import com.c2kernel.graph.model.GraphModelManager;
import com.c2kernel.graph.model.GraphPoint;
import com.c2kernel.graph.model.Selection;
import com.c2kernel.graph.model.Vertex;
import com.c2kernel.utils.Resource;
public class GraphPanel extends JPanel implements Observer
{
protected final Paint mSelectionPaint = Color.black;
protected final Paint mStartPaint = Color.green;
protected final Image mResizePadImg = Resource.getImageResource("graph/resizepad.gif").getImage();
protected final BasicStroke mDashed =
new BasicStroke(1.0f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_MITER, 10.0f, new float[] { 5.0f }, 0.0f);
protected GraphModelManager mGraphModelManager = null;
protected VertexRenderer mVertexRenderer = null;
protected DirectedEdgeRenderer mDirectedEdgeRenderer = null;
public GraphPanel(DirectedEdgeRenderer eRenderer, VertexRenderer vRenderer)
{
mVertexRenderer = vRenderer;
mDirectedEdgeRenderer = eRenderer;
// Request the keyboard focus if the mouse
// is pressed on the graph panel
addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent me)
{
requestFocus();
}
});
}
public void setGraphModelManager(GraphModelManager graphModelManager)
{
mGraphModelManager = graphModelManager;
}
public void update(Observable o, Object arg)
{
if (arg instanceof GraphModelResizedEvent || arg instanceof EntireModelChangedEvent)
{
setPreferredSize(new Dimension(mGraphModelManager.getModel().getWidth(), mGraphModelManager.getModel().getHeight()));
revalidate();
}
repaint();
}
public void paintComponent(Graphics g)
{
Graphics2D g2d = (Graphics2D) g;
DirectedEdge[] edges = null;
Vertex[] vertices = null;
Vertex startVertex = null;
Selection selection = null;
ElasticBand elasticBand = null;
Vertex newEdgeOriginVertex = null;
GraphPoint newEdgeOriginPoint = null;
Point newEdgeEndPoint = null;
GraphPoint vertexCentre = null;
int i = 0;
super.paintComponent(g);
if (mGraphModelManager != null)
{
// Get the edges and vertices from the model
edges = mGraphModelManager.getModel().getEdges();
vertices = mGraphModelManager.getModel().getVertices();
//graphable = mGraphModelManager.getModel().
// Draw the edges
for (i = 0; i < edges.length; i++)
{
mDirectedEdgeRenderer.draw(g2d, edges[i]);
}
// Draw the vertices
for (i = 0; i < vertices.length; i++)
{
mVertexRenderer.draw(g2d, vertices[i]);
}
g2d.setPaint(mStartPaint);
// Highlight the start vertex if there is one
startVertex = mGraphModelManager.getModel().getStartVertex();
if (startVertex != null)
{
drawVertexHighlight(g2d, startVertex, 1);
}
// Get the present selection
selection = mGraphModelManager.getModel().getSelection();
g2d.setPaint(mSelectionPaint);
// Draw the outline of the selected
// vertices if there are any
if (selection.mVertices != null)
{
g2d.setStroke(mDashed);
for (i = 0; i < selection.mVertices.length; i++)
{
if (selection.mVertices[i] != mGraphModelManager.getModel().getContainingVertex())
drawVertexHighlight(g2d, selection.mVertices[i], 5);
}
// Draw the resize pads if there is one and only one vertex selected
if (selection.mVertices.length == 1 &&
selection.mVertices[0] != mGraphModelManager.getModel().getContainingVertex())
{
vertexCentre = selection.mVertices[0].getCentrePoint();
g2d.drawImage(
mResizePadImg,
vertexCentre.x + selection.mVertices[0].getWidth() / 2,
vertexCentre.y + selection.mVertices[0].getHeight() / 2,
this);
}
}
// Draw the outline of the selected
// edge if there is one
if (selection.mEdge != null)
{
drawEdgeHighlight(g2d, selection.mEdge);
}
// Get the elastic band
elasticBand = mGraphModelManager.getModel().getElasticBand();
// Draw the elastic band if there
// is one
if (elasticBand != null)
{
g2d.drawLine(
elasticBand.mFixedCorner.x,
elasticBand.mFixedCorner.y,
elasticBand.mMovingCorner.x,
elasticBand.mFixedCorner.y);
g2d.drawLine(
elasticBand.mMovingCorner.x,
elasticBand.mFixedCorner.y,
elasticBand.mMovingCorner.x,
elasticBand.mMovingCorner.y);
g2d.drawLine(
elasticBand.mMovingCorner.x,
elasticBand.mMovingCorner.y,
elasticBand.mFixedCorner.x,
elasticBand.mMovingCorner.y);
g2d.drawLine(
elasticBand.mFixedCorner.x,
elasticBand.mMovingCorner.y,
elasticBand.mFixedCorner.x,
elasticBand.mFixedCorner.y);
}
// Draw the new edge under construction if there is one
newEdgeEndPoint = mGraphModelManager.getModel().getNewEdgeEndPoint();
newEdgeOriginVertex = mGraphModelManager.getModel().getNewEdgeOriginVertex();
if ((newEdgeEndPoint != null) && (newEdgeOriginVertex != null))
{
newEdgeOriginPoint = newEdgeOriginVertex.getCentrePoint();
g2d.setPaint(Color.black);
g2d.drawLine(newEdgeOriginPoint.x, newEdgeOriginPoint.y, newEdgeEndPoint.x, newEdgeEndPoint.y);
}
}
}
// Draws the highlight of the specified vertex the specified dist from its outline
protected void drawVertexHighlight(Graphics2D g2d, Vertex vertex, int dist)
{
GraphPoint[] outlinePoints = vertex.getOutlinePoints();
GraphPoint centrePoint = vertex.getCentrePoint();
int i = 0;
/*
* float dash1[] ={5.0f}; BasicStroke bs = new BasicStroke(5.0f, BasicStroke.CAP_BUTT,BasicStroke.JOIN_ROUND,10.0f, dash1,0.0f);
*/
for (i = 0; i < outlinePoints.length - 1; i++)
{
drawShiftedLine(dist, g2d, centrePoint, outlinePoints[i].x, outlinePoints[i].y, outlinePoints[i + 1].x, outlinePoints[i + 1].y);
}
drawShiftedLine(
dist,
g2d,
centrePoint,
outlinePoints[outlinePoints.length - 1].x,
outlinePoints[outlinePoints.length - 1].y,
outlinePoints[0].x,
outlinePoints[0].y);
}
// Draws the specifed line the specified distance away from the specified centre point
private void drawShiftedLine(int dist, Graphics2D g2d, GraphPoint centrePoint, int x1, int y1, int x2, int y2)
{
if (x1 > centrePoint.x)
x1 += dist;
if (x1 < centrePoint.x)
x1 -= dist;
if (y1 > centrePoint.y)
y1 += dist;
if (y1 < centrePoint.y)
y1 -= dist;
if (x2 > centrePoint.x)
x2 += dist;
if (x2 < centrePoint.x)
x2 -= dist;
if (y2 > centrePoint.y)
y2 += dist;
if (y2 < centrePoint.y)
y2 -= dist;
g2d.drawLine(x1, y1, x2, y2);
}
// Draws the highlight of the specified edge
protected void drawEdgeHighlight(Graphics2D g2d, DirectedEdge edge)
{
GraphPoint originPoint = edge.getOriginPoint();
GraphPoint terminusPoint = edge.getTerminusPoint();
int midX = originPoint.x + (terminusPoint.x - originPoint.x) / 2;
int midY = originPoint.y + (terminusPoint.y - originPoint.y) / 2;
int minX = midX - 10;
int minY = midY - 10;
int maxX = midX + 10;
int maxY = midY + 10;
g2d.drawLine(minX, minY, maxX, minY);
g2d.drawLine(maxX, minY, maxX, maxY);
g2d.drawLine(maxX, maxY, minX, maxY);
g2d.drawLine(minX, maxY, minX, minY);
}
public void printComponent(Graphics g)
{
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g;
DirectedEdge[] edges = null;
Vertex[] vertices = null;
Vertex startVertex = null;
Selection selection = null;
ElasticBand elasticBand = null;
Vertex newEdgeOriginVertex = null;
GraphPoint newEdgeOriginPoint = null;
Point newEdgeEndPoint = null;
GraphPoint vertexCentre = null;
int i = 0;
g.setColor(Color.white);
g2d.fillRect(0,0,getWidth(),getHeight());
if (mGraphModelManager != null)
{
// Get the edges and vertices from the model
edges = mGraphModelManager.getModel().getEdges();
vertices = mGraphModelManager.getModel().getVertices();
//graphable = mGraphModelManager.getModel().
// Draw the edges
for (i = 0; i < edges.length; i++)
{
mDirectedEdgeRenderer.draw(g2d, edges[i]);
}
// Draw the vertices
for (i = 0; i < vertices.length; i++)
{
mVertexRenderer.draw(g2d, vertices[i]);
}
g2d.setPaint(mStartPaint);
// Highlight the start vertex if there is one
startVertex = mGraphModelManager.getModel().getStartVertex();
if (startVertex != null)
{
drawVertexHighlight(g2d, startVertex, 1);
}
}
}
protected void superPaint(Graphics g)
{
super.paintComponent(g);
}
}
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