A rudimentary chart library
import java.util.Iterator;
import java.awt.*;
import java.awt.event.*;
import java.text.DecimalFormat;
import javax.swing.*;
import no.geosoft.cc.geometry.Geometry;
import no.geosoft.cc.util.NiceNumbers;
import no.geosoft.cc.util.NiceNumber;
import no.geosoft.cc.graphics.*;
/**
* G demo program. Demonstrates:
*
* <ul>
* <li>A rudimentary chart library
* <li>The use of multiple scenes
* <li>World extent usage
* <li>Zooming and scrolling
* <li><em>Nice number</em> generation
* </ul>
*
* @author <a href="mailto:jacob.dreyer@geosoft.no">Jacob Dreyer</a>
*/
public class Demo15 extends JFrame
{
/**
* Class for creating the demo canvas and hande Swing events.
*/
public Demo15()
{
super ("G Graphics Library - Demo 15");
setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
// Create the GUI
JPanel topLevel = new JPanel();
topLevel.setLayout (new BorderLayout());
getContentPane().add (topLevel);
JScrollBar hScrollBar = new JScrollBar (JScrollBar.HORIZONTAL);
getContentPane().add (hScrollBar, BorderLayout.SOUTH);
JScrollBar vScrollBar = new JScrollBar (JScrollBar.VERTICAL);
getContentPane().add (vScrollBar, BorderLayout.EAST);
// Create the graphic canvas
GWindow window = new GWindow (new Color (255, 255, 255));
topLevel.add (window.getCanvas(), BorderLayout.CENTER);
// Create a value set to be plotted
ValueSet valueSet = new ValueSet();
// Definition of exact chart location inside window
Insets insets = new Insets (80, 60, 20, 20);
// Create a "background" device oriented annotation scene
GScene annotationScene = new GScene (window);
GObject annotation = new Annotation (insets);
annotationScene.add (annotation);
// Create a value specific "plot" scene
GScene plot = new Plot (window, valueSet, insets);
annotationScene.setUserData (plot);
pack();
setSize (new Dimension (500, 500));
setVisible (true);
// Start zoom interaction
GStyle zoomStyle = new GStyle();
zoomStyle.setForegroundColor (new Color (0, 0, 0));
zoomStyle.setBackgroundColor (new Color (0.8f, 1.0f, 0.8f, 0.3f));
window.startInteraction (new ZoomInteraction (plot, zoomStyle));
// Make sure plot can be scrolled
plot.installScrollHandler (hScrollBar, vScrollBar);
}
private class Annotation extends GObject
{
private Insets insets_;
private GSegment background_;
private GSegment title_;
public Annotation (Insets insets)
{
insets_ = insets;
background_ = new GSegment();
GStyle backgroundStyle = new GStyle();
backgroundStyle.setBackgroundColor (new Color (1.0f, 1.0f, 0.9f, 0.8f));
background_.setStyle (backgroundStyle);
addSegment (background_);
title_ = new GSegment();
GStyle titleStyle = new GStyle();
titleStyle.setForegroundColor (new Color (100, 120, 120));
titleStyle.setFont (new Font ("Dialog", Font.BOLD, 20));
title_.setStyle (titleStyle);
title_.setText (new GText ("G Graphics Library - Demo 15"));
addSegment (title_);
GStyle axisStyle = new GStyle();
axisStyle.setForegroundColor (new Color (100, 100, 100));
axisStyle.setBackgroundColor (null);
axisStyle.setFont (new Font ("Dialog", Font.BOLD, 10));
Axis horizontalAxis = new Axis (true, insets_);
horizontalAxis.setStyle (axisStyle);
add (horizontalAxis);
Axis verticalAxis = new Axis (false, insets_);
verticalAxis.setStyle (axisStyle);
add (verticalAxis);
}
public void draw()
{
GViewport viewport = getScene().getViewport();
int x0 = insets_.left;
int y0 = insets_.top;
int width = viewport.getX3() - insets_.right - insets_.left + 1;
int height = viewport.getY3() - insets_.bottom - insets_.top + 1;
// Draw background
background_.setGeometry (Geometry.createRectangle (x0, y0, width, height));
// Draw title
title_.setGeometry (x0 + width / 2, y0 / 2);
}
}
/**
* A GObject representing one axis with annotation.
*/
private class Axis extends GObject
{
private Insets insets_;
private boolean isTop_;
public Axis (boolean isTop, Insets insets)
{
isTop_ = isTop;
insets_ = insets;
}
public void draw()
{
removeSegments();
// Get device coordinates
GViewport viewport = getScene().getViewport();
int vx0 = insets_.left;
int vy0 = insets_.top;
int vx1 = viewport.getX3() - insets_.right;
int vy1 = viewport.getY3() - insets_.bottom;
// Get annotation range
GObject plot = (GObject) getScene().getUserData();
if (plot == null) return;
GWorldExtent worldExtent = plot.getScene().getWorldExtent();
double[] w0 = worldExtent.get (0);
double[] w1 = worldExtent.get (1);
double[] w2 = worldExtent.get (2);
// Prepare axis values
double from = isTop_ ? w0[0] : w2[1];
double to = isTop_ ? w1[0] : w0[1];
int x0 = vx0;
int y0 = vy0;
int x1 = isTop_ ? vx1 : x0;
int y1 = isTop_ ? y0 : vy1;
double length = Geometry.length (x0, y0, x1, y1);
int n = (int) (length / 50.0);
NiceNumbers niceNumbers = new NiceNumbers (from, to, n, true);
DecimalFormat format = new DecimalFormat ("0.00");
for (Iterator i = niceNumbers.iterator(); i.hasNext(); ) {
NiceNumber niceNumber = (NiceNumber) i.next();
int rank = niceNumber.getRank();
if (rank < 2) {
int tickLength = rank == 0 ? 5 : 3;
GSegment tick = new GSegment();
int tx0 = isTop_ ? x0 + (int) Math.round (niceNumber.getPosition() * (x1 - x0)) : x0 - tickLength;
int ty0 = isTop_ ? y0 - tickLength : y0 + (int) Math.round (niceNumber.getPosition() * (y1 - y0));
int tx1 = isTop_ ? tx0 : (rank == 0 ? vx1 : x0);
int ty1 = isTop_ ? (rank == 0 ? vy1 : y0) : ty0;
tick.setGeometry (tx0, ty0, tx1, ty1);
if (rank == 0) {
double value = niceNumber.getValue();
GText text = new GText (format.format (value),
isTop_ ? GPosition.TOP : GPosition.LEFT);
tick.setText (text);
}
addSegment (tick);
}
}
}
}
private class Curve extends GObject
{
private GSegment curve_;
private double[] values_;
Curve (ValueSet valueSet)
{
curve_ = new GSegment();
addSegment (curve_);
int nValues = 400;
values_ = new double[2*nValues];
double[] xRange = valueSet.getXRange();
double step = (xRange[1] - xRange[0]) / nValues;
int index = 0;
for (int i = 0; i < nValues; i++) {
double x = xRange[0] + i*step;
double y = valueSet.getY (x);
values_[index + 0] = x;
values_[index + 1] = y;
index+=2;
}
}
public void draw()
{
curve_.setGeometryXy (values_);
}
}
/**
* Defines the geometry and presentation for a sample
* graphic object.
*/
private class Plot extends GScene
{
private Insets insets_;
Plot (GWindow window, ValueSet valueSet, Insets insets)
{
super (window);
insets_ = insets;
double[] xRange = valueSet.getXRange();
double[] yRange = valueSet.getYRange();
double w0[] = {xRange[0], yRange[0], 0.0};
double w1[] = {xRange[1], yRange[0], 0.0};
double w2[] = {xRange[0], yRange[1], 0.0};
setWorldExtent (w0, w1, w2);
Curve curve = new Curve (valueSet);
GStyle curveStyle = new GStyle();
curveStyle.setForegroundColor (new Color (255, 0, 0));
curveStyle.setLineWidth (2);
curve.setStyle (curveStyle);
add (curve);
}
protected void resize (double dx, double dy)
{
super.resize (dx, dy);
setViewport (insets_.left, insets_.top,
getWindow().getWidth() - insets_.left - insets_.right,
getWindow().getHeight() - insets_.top - insets_.bottom);
}
}
private class ValueSet
{
public double getMin()
{
return 0.0;
}
public double[] getXRange()
{
return new double[] {-100.0, +100.0};
}
public double[] getYRange()
{
return new double[] {-1.0, +1.0};
}
public double getY (double x)
{
double a = Math.sqrt (Math.abs (x));
return Math.sin (x) / (a == 0.0 ? 1.0 : a);
}
}
public static void main (String[] args)
{
new Demo15();
}
}
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