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Cristal-ise is a description-driven software platform originally developed to track the construction of the CMS ECAL detector of the LHC at CERN. This is its core library, known as the kernel, which manages business objects called Items. Items are entirely configured from data, called descriptions, held in other Items. Every change of a state in an Item is a consequence of an execution of an activity in that Item's lifecycle, meaning that Cristal-ise applications are completely traceable, even in their design. It also supports extensive versioning of Item description data, giving the system a high level of flexibility.

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/**
 * This file is part of the CRISTAL-iSE kernel.
 * Copyright (c) 2001-2015 The CRISTAL Consortium. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation; either version 3 of the License, or (at
 * your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; with out even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 *
 * http://www.fsf.org/licensing/licenses/lgpl.html
 */
package org.cristalise.kernel.lifecycle.renderer;

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.IOException;

import org.cristalise.kernel.graph.model.DirectedEdge;
import org.cristalise.kernel.graph.model.GraphModel;
import org.cristalise.kernel.graph.model.GraphPoint;
import org.cristalise.kernel.graph.model.Vertex;
import org.cristalise.kernel.graph.renderer.DirectedEdgeRenderer;
import org.cristalise.kernel.graph.renderer.VertexRenderer;
import org.cristalise.kernel.utils.Logger;

/**
 *
 *
 */
public class LifecycleRenderer {

    GraphModel           mGraphModel;
    DirectedEdgeRenderer mDirectedEdgeRenderer;
    VertexRenderer       mVertexRenderer;

    public LifecycleRenderer(GraphModel graphModel, boolean defGeneration) {
        mGraphModel = graphModel;

        if (defGeneration) {
            mDirectedEdgeRenderer = new WfDirectedEdgeDefRenderer();
            mVertexRenderer = new WfVertexDefRenderer();
        }
        else {
            mDirectedEdgeRenderer = new WfDirectedEdgeRenderer();
            mVertexRenderer = new WfVertexRenderer();
        }
    }

    public int getZoomFactor(int maxHeight, int maxWidth) {
        int width = mGraphModel.getWidth();
        int height = mGraphModel.getHeight();

        return (maxHeight == 0 && maxWidth == 0) ?
                100 : Math.min(maxWidth * 100 / width, Math.min(maxHeight * 100 / height, 100));
    }

    public BufferedImage getWorkFlowModelImage(int maxHeight, int maxWidth) throws IOException {
        int width = mGraphModel.getWidth();
        int height = mGraphModel.getHeight();

        int zoomFactor = getZoomFactor(maxHeight, maxWidth);

        BufferedImage img = new BufferedImage(width * zoomFactor / 100, height * zoomFactor / 100, BufferedImage.TYPE_INT_ARGB);

        Graphics2D g2d = img.createGraphics();
        g2d.scale((double) zoomFactor / 100, (double) zoomFactor / 100);

        //set the background color transparent
        //g2d.setComposite(AlphaComposite.Clear);

        //set the 'canvas' white
        g2d.setColor(Color.white);
        g2d.fillRect(0, 0, width, height);

        draw(g2d);

        return img;
    }

    public void draw(Graphics2D g2d) {
        if (mGraphModel == null) {
            Logger.warning("LifecycleGenerator.draw() - GraphModel is NULL!");
            return;
        }

        DirectedEdge[] edges = mGraphModel.getEdges();
        Vertex[] vertices = mGraphModel.getVertices();

        // Draw the edges
        for (int i = 0; i < edges.length; i++) mDirectedEdgeRenderer.draw(g2d, edges[i]);

        // Draw the vertices
        for (int i = 0; i < vertices.length; i++) mVertexRenderer.draw(g2d, vertices[i]);

        g2d.setPaint(Color.green);

        // Highlight the start vertex if there is one
        Vertex startVertex = mGraphModel.getStartVertex();
        if (startVertex != null) drawVertexHighlight(g2d, startVertex, 1);
    }

    // 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);
    }

    // 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();

        /*
         * float dash1[] ={5.0f}; BasicStroke bs = new BasicStroke(5.0f, BasicStroke.CAP_BUTT,BasicStroke.JOIN_ROUND,10.0f, dash1,0.0f);
         */
        for (int 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 static 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);
    }
}