AWTPlotRenderer.java

/*
 * Copyright (C) 2010, Google Inc.
 * Copyright (C) 2008, Robin Rosenberg <robin.rosenberg@dewire.com>
 * Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org> and others
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Distribution License v. 1.0 which is available at
 * https://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

package org.eclipse.jgit.awtui;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Polygon;
import java.io.Serializable;

import org.eclipse.jgit.awtui.CommitGraphPane.GraphCellRender;
import org.eclipse.jgit.awtui.SwingCommitList.SwingLane;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.revplot.AbstractPlotRenderer;
import org.eclipse.jgit.revplot.PlotCommit;

final class AWTPlotRenderer extends AbstractPlotRenderer<SwingLane, Color>
        implements Serializable {
    private static final long serialVersionUID = 1L;

    final GraphCellRender cell;

    transient Graphics2D g;

    AWTPlotRenderer(GraphCellRender c) {
        cell = c;
    }

    void paint(Graphics in, PlotCommit<SwingLane> commit) {
        g = (Graphics2D) in.create();
        try {
            final int h = cell.getHeight();
            g.setColor(cell.getBackground());
            g.fillRect(0, 0, cell.getWidth(), h);
            if (commit != null)
                paintCommit(commit, h);
        } finally {
            g.dispose();
            g = null;
        }
    }

    /** {@inheritDoc} */
    @Override
    protected void drawLine(final Color color, int x1, int y1, int x2,
            int y2, int width) {
        if (y1 == y2) {
            x1 -= width / 2;
            x2 -= width / 2;
        } else if (x1 == x2) {
            y1 -= width / 2;
            y2 -= width / 2;
        }

        g.setColor(color);
        g.setStroke(CommitGraphPane.stroke(width));
        g.drawLine(x1, y1, x2, y2);
    }

    /** {@inheritDoc} */
    @Override
    protected void drawCommitDot(final int x, final int y, final int w,
            final int h) {
        g.setColor(Color.blue);
        g.setStroke(CommitGraphPane.strokeCache[1]);
        g.fillOval(x, y, w, h);
        g.setColor(Color.black);
        g.drawOval(x, y, w, h);
    }

    /** {@inheritDoc} */
    @Override
    protected void drawBoundaryDot(final int x, final int y, final int w,
            final int h) {
        g.setColor(cell.getBackground());
        g.setStroke(CommitGraphPane.strokeCache[1]);
        g.fillOval(x, y, w, h);
        g.setColor(Color.black);
        g.drawOval(x, y, w, h);
    }

    /** {@inheritDoc} */
    @Override
    protected void drawText(String msg, int x, int y) {
        final int texth = g.getFontMetrics().getHeight();
        final int y0 = (y - texth) / 2 + (cell.getHeight() - texth) / 2;
        g.setColor(cell.getForeground());
        g.drawString(msg, x, y0 + texth - g.getFontMetrics().getDescent());
    }

    /** {@inheritDoc} */
    @Override
    protected Color laneColor(SwingLane myLane) {
        return myLane != null ? myLane.color : Color.black;
    }

    void paintTriangleDown(int cx, int y, int h) {
        final int tipX = cx;
        final int tipY = y + h;
        final int baseX1 = cx - 10 / 2;
        final int baseX2 = tipX + 10 / 2;
        final int baseY = y;
        final Polygon triangle = new Polygon();
        triangle.addPoint(tipX, tipY);
        triangle.addPoint(baseX1, baseY);
        triangle.addPoint(baseX2, baseY);
        g.fillPolygon(triangle);
        g.drawPolygon(triangle);
    }

    /** {@inheritDoc} */
    @Override
    protected int drawLabel(int x, int y, Ref ref) {
        String txt;
        String name = ref.getName();
        if (name.startsWith(Constants.R_HEADS)) {
            g.setBackground(Color.GREEN);
            txt = name.substring(Constants.R_HEADS.length());
        } else if (name.startsWith(Constants.R_REMOTES)){
            g.setBackground(Color.LIGHT_GRAY);
            txt = name.substring(Constants.R_REMOTES.length());
        } else if (name.startsWith(Constants.R_TAGS)){
            g.setBackground(Color.YELLOW);
            txt = name.substring(Constants.R_TAGS.length());
        } else {
            // Whatever this would be
            g.setBackground(Color.WHITE);
            if (name.startsWith(Constants.R_REFS))
                txt = name.substring(Constants.R_REFS.length());
            else
                txt = name; // HEAD and such
        }
        if (ref.getPeeledObjectId() != null) {
            float[] colorComponents = g.getBackground().getRGBColorComponents(null);
            colorComponents[0] *= 0.9f;
            colorComponents[1] *= 0.9f;
            colorComponents[2] *= 0.9f;
            g.setBackground(new Color(colorComponents[0],colorComponents[1],colorComponents[2]));
        }
        if (txt.length() > 12)
            txt = txt.substring(0,11) + "\u2026"; // ellipsis "…" (in UTF-8) //$NON-NLS-1$

        final int texth = g.getFontMetrics().getHeight();
        int textw = g.getFontMetrics().stringWidth(txt);
        g.setColor(g.getBackground());
        int arcHeight = texth/4;
        int y0 = y - texth/2 + (cell.getHeight() - texth)/2;
        g.fillRoundRect(x , y0, textw + arcHeight*2, texth -1, arcHeight, arcHeight);
        g.setColor(g.getColor().darker());
        g.drawRoundRect(x, y0, textw + arcHeight*2, texth -1 , arcHeight, arcHeight);
        g.setColor(Color.BLACK);
        g.drawString(txt, x + arcHeight, y0 + texth - g.getFontMetrics().getDescent());

        return arcHeight * 3 + textw;
    }
}