customcanvas.java

经典的java图像处理程序源码

package com.mxgraph.swing.examples;

import javax.swing.BorderFactory;
import javax.swing.CellRendererPane;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.border.BevelBorder;

import com.mxgraph.canvas.mxGraphics2DCanvas;
import com.mxgraph.canvas.mxICanvas;
import com.mxgraph.canvas.mxImageCanvas;
import com.mxgraph.swing.mxGraphComponent;
import com.mxgraph.swing.handler.mxRubberband;
import com.mxgraph.swing.view.mxInteractiveCanvas;
import com.mxgraph.view.mxCellState;
import com.mxgraph.view.mxGraph;

public class CustomCanvas extends JFrame
{

	public CustomCanvas()
	{
		super("Custom Canvas");

		// Demonstrates the use of a Swing component for rendering vertices.
		// Note: Use the heavyweight feature to allow for event handling in
		// the Swing component that is used for rendering the vertex.

		mxGraph graph = new mxGraph()
		{
			public void drawStateWithLabel(mxICanvas canvas, mxCellState state,
					String label)
			{
				// Indirection for wrapped swing canvas inside image canvas (used for creating
				// the preview image when cells are dragged)
				if (getModel().isVertex(state.getCell())
						&& canvas instanceof mxImageCanvas
						&& ((mxImageCanvas) canvas).getGraphicsCanvas() instanceof SwingCanvas)
				{
					((SwingCanvas) ((mxImageCanvas) canvas).getGraphicsCanvas())
							.drawVertex(state, label);
				}
				// Redirection of drawing vertices in SwingCanvas
				else if (getModel().isVertex(state.getCell())
						&& canvas instanceof SwingCanvas)
				{
					((SwingCanvas) canvas).drawVertex(state, label);
				}
				else
				{
					super.drawStateWithLabel(canvas, state, label);
				}
			}
		};

		Object parent = graph.getDefaultParent();

		graph.getModel().beginUpdate();
		try
		{

			Object v1 = graph.insertVertex(parent, null, "Hello", 20, 20, 80,
					30);
			Object v2 = graph.insertVertex(parent, null, "World!", 240, 150,
					80, 30);
			graph.insertEdge(parent, null, "Edge", v1, v2);
		}
		finally
		{
			graph.getModel().endUpdate();
		}

		mxGraphComponent graphComponent = new mxGraphComponent(graph)
		{
			public mxInteractiveCanvas createCanvas()
			{
				return new SwingCanvas(this);
			}
		};

		getContentPane().add(graphComponent);

		// Adds rubberband selection
		new mxRubberband(graphComponent);
	}

	public class SwingCanvas extends mxInteractiveCanvas
	{
		protected CellRendererPane rendererPane = new CellRendererPane();

		protected JLabel vertexRenderer = new JLabel();

		protected mxGraphComponent graphComponent;

		public SwingCanvas(mxGraphComponent graphComponent)
		{
			this.graphComponent = graphComponent;

			vertexRenderer.setBorder(BorderFactory
					.createBevelBorder(BevelBorder.RAISED));
			vertexRenderer.setHorizontalAlignment(JLabel.CENTER);
			vertexRenderer.setBackground(graphComponent.getBackground()
					.darker());
			vertexRenderer.setOpaque(true);
		}

		public void drawVertex(mxCellState state, String label)
		{
			vertexRenderer.setText(label);
			// TODO: Configure other properties...

			rendererPane.paintComponent(g, vertexRenderer, graphComponent,
					(int) state.getX() + translate.x, (int) state.getY()
							+ translate.y, (int) state.getWidth(), (int) state
							.getHeight(), true);
		}

	}

	public static void main(String[] args)
	{
		CustomCanvas frame = new CustomCanvas();
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setSize(400, 320);
		frame.setVisible(true);
	}

}