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/*******************************************************************************
* Copyright (c) 2012 Tilera Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* William R. Swanson (Tilera Corporation)
*******************************************************************************/
package org.eclipse.cdt.visualizer.examples.sourcegraph;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Hashtable;
import org.eclipse.cdt.visualizer.ui.canvas.BufferedCanvas;
import org.eclipse.cdt.visualizer.ui.util.Colors;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Composite;
// ---------------------------------------------------------------------------
// SourceGraphControl
// ---------------------------------------------------------------------------
/** Simple control that displays a graph based on a source text selection. */
public class SourceGraphControl extends BufferedCanvas
{
// --- constants ---
/** Margin used in drawing graph and computing control height. */
public static final int MARGIN = 10;
/** Line height used in drawing graph and computing control height. */
public static final int LINE_HEIGHT = 20;
// --- members ---
/** Text we're currently displaying. */
protected String m_sourceText = ""; //$NON-NLS-1$
/** Data structure used to hold character stats. */
class CharStat
implements Comparable<CharStat>
{
public String characters;
public int count;
public CharStat(String c) {
characters = c;
count = 0;
}
@Override
public int compareTo(CharStat o) {
int c1 = count;
int c2 = o.count;
int cmp = (c1 < c2) ? -1 : (c1 > c2) ? 1 : 0;
// we want to sort in descending order, so negate result
return -cmp;
};
};
/** List of characters we discovered and their occurrences. */
ArrayList<CharStat> m_characters;
// --- constructors/destructors ---
/** Constructor. */
public SourceGraphControl(Composite parent) {
super(parent);
m_characters = new ArrayList<CharStat>();
}
/** Dispose method. */
@Override
public void dispose() {
super.dispose();
}
// --- accessors ---
/** Sets source text to graph. */
public void setSourceText(String text)
{
processText(text);
SourceGraphControl.this.update();
}
// --- text processing methods ---
/** Processes text into digested display form. */
public void processText(String text)
{
if (text == null) text = ""; //$NON-NLS-1$
m_sourceText = text;
// TODO: reuse the array/hashtable and stat objects
Hashtable<String, CharStat> characters =
new Hashtable<String, CharStat>();
int len = m_sourceText.length();
int fragment_length = 2;
if (len >= fragment_length) {
for (int i = 0; i<len-fragment_length+1; ++i) {
String c = m_sourceText.substring(i,i+fragment_length);
// Don't bother with fragments containing spaces
// and non-printing chars.
boolean skip = false;
for (int j=0; j<c.length(); ++j)
{
if (c.charAt(j) <= 32 || c.charAt(j) > 127) {
skip = true;
break;
}
}
if (skip) continue;
CharStat cs = characters.get(c);
if (cs == null) {
cs = new CharStat(c);
characters.put(c, cs);
}
++cs.count;
}
}
m_characters.clear();
m_characters.addAll(characters.values());
Collections.sort(m_characters);
characters.clear();
Rectangle bounds = getBounds();
int height = MARGIN * 2 + m_characters.size() * LINE_HEIGHT;
bounds.height = height;
setBounds(bounds);
}
// --- painting methods ---
/** Invoked when canvas repaint event is raised.
* Default implementation clears canvas to background color.
*/
@Override
public void paintCanvas(GC gc) {
gc.setBackground(Colors.BLACK);
gc.setForeground(Colors.WHITE);
clearCanvas(gc);
int margin = MARGIN;
int tw = 90;
int tw2 = 45;
int lh = LINE_HEIGHT;
int x = margin;
int y = margin;
Rectangle area = getClientArea();
int w = area.width - margin*2 - tw;
int maxcount = 0;
for (CharStat cs : m_characters)
{
// We're sorted in descending order, so first element
// that we draw will always have the largest count.
if (maxcount == 0) maxcount = cs.count;
gc.drawText("[" + cs.characters + "]", x, y); //$NON-NLS-1$ //$NON-NLS-2$
gc.drawText("(" + cs.count + ")", x + tw2, y); //$NON-NLS-1$ //$NON-NLS-2$
double proportion = cs.count * 1.0 / maxcount;
int bw = (int) Math.round(proportion * w);
Color oldb = gc.getBackground();
if (proportion > .70)
gc.setBackground(Colors.GREEN);
else if (proportion > .40)
gc.setBackground(Colors.YELLOW);
else
gc.setBackground(Colors.RED);
gc.fillRectangle(x + tw, y, bw, lh-5);
gc.setBackground(oldb);
y += lh;
}
}
// --- update methods ---
/**
* Refresh the control's content based on current data.
*/
public void refresh() {
SourceGraphControl.this.update();
}
// --- event handlers ---
/** Invoked when panel is resized. */
@Override
public void resized(Rectangle bounds) {
refresh();
}
}
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