Mega Code Archive
Simple animation technique
<![CDATA[
import java.awt.*;
import javax.swing.*;
import no.geosoft.cc.geometry.Geometry;
import no.geosoft.cc.geometry.Matrix4x4;
import no.geosoft.cc.graphics.*;
/**
* G demo program. Demonstrates:
*
* <ul>
* <li>Simple animation technique
* </ul>
*
* @author <a href="mailto:jacob.dreyer@geosoft.no">Jacob Dreyer</a>
*/
public class Demo9 extends JFrame
{
public Demo9()
{
super ("G Graphics Library - Demo 9");
setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
// Create graphic canvas
GWindow window = new GWindow (new Color (200, 210, 200));
getContentPane().add (window.getCanvas());
// Create a view with default viewport and world extent
GScene scene = new GScene (window);
// Create a graphic object and put into view
TestObject object = new TestObject();
scene.add (object);
pack();
setSize (new Dimension (500, 500));
setVisible (true);
// Keep program running. Add sleep() if it rotates too fast.
while (!false) {
object.rotate();
window.refresh();
}
}
class TestObject extends GObject
{
private static final int AXIS1_LENGTH = 500;
private static final int AXIS2_LENGTH = 220;
private static final int RADII = 100;
private double[] spikePos_;
private GSegment weel_;
private GSegment[] spikes_;
private GSegment axis1_;
private GSegment axis2_;
private double position_;
public TestObject()
{
spikePos_ = new double[] {0.0 * Math.PI / 3.0,
1.0 * Math.PI / 3.0,
2.0 * Math.PI / 3.0,
3.0 * Math.PI / 3.0,
4.0 * Math.PI / 3.0,
5.0 * Math.PI / 3.0};
spikes_ = new GSegment[spikePos_.length];
GStyle spikeStyle = new GStyle();
spikeStyle.setLineWidth (6);
spikeStyle.setCapStyle (BasicStroke.CAP_ROUND);
spikeStyle.setForegroundColor (new Color (130, 140, 130));
weel_ = new GSegment();
GStyle weelStyle = new GStyle();
weelStyle.setForegroundColor (new Color (70, 80, 70));
weelStyle.setLineWidth (20);
weel_.setStyle (weelStyle);
addSegment (weel_);
for (int i = 0; i < spikePos_.length; i++) {
spikes_[i] = new GSegment();
spikes_[i].setStyle (spikeStyle);
addSegment (spikes_[i]);
}
axis2_ = new GSegment();
GStyle style = new GStyle();
style.setForegroundColor (new Color (0.3f, 0.4f, 0.3f, 0.5f));
style.setLineWidth (30);
axis2_.setStyle (style);
addSegment (axis2_);
GText text = new GText (null, GPosition.RIGHT | GPosition.WEST);
style = new GStyle();
style.setForegroundColor (new Color (255, 255, 255));
style.setFont (new Font ("Dialog", Font.BOLD, 18));
text.setStyle (style);
axis2_.setText (text);
axis1_ = new GSegment();
style = new GStyle();
style.setForegroundColor (new Color (160, 160, 160));
style.setLineWidth (15);
// style.setCapStyle (BasicStroke.CAP_BUTT);
axis1_.setStyle (style);
addSegment (axis1_);
position_ = 0.0;
}
public void draw()
{
// Center of viewport
int x0 = (int) getScene().getViewport().getCenterX() + 100;
int y0 = (int) getScene().getViewport().getCenterY();
// Geometry for the wheel circumference
int[] xy = Geometry.createEllipse (x0, y0, RADII, RADII);
weel_.setGeometry (xy);
// Wheel spikes
for (int i = 0; i < spikePos_.length; i++) {
double position = spikePos_[i] + position_;
if (position_ > Math.PI * 2) position -= Math.PI * 2;
Matrix4x4 m = new Matrix4x4();
m.rotateZ (position);
m.translate (x0, y0, 0);
double[] xyz = {RADII, 0.0, 0.0};
xyz = m.transformPoint (xyz);
spikes_[i].setGeometry (x0, y0, (int) xyz[0], (int) xyz[1]);
// On first spike add the axis
if (i == 0) {
int axisX0 = (int) xyz[0];
int axisY0 = (int) xyz[1];
int axisY1 = y0;
int dy2 = (axisY1 - axisY0) * (axisY1 - axisY0);
int dx = (int) Math.sqrt (AXIS2_LENGTH * AXIS2_LENGTH - dy2);
int axisX1 = axisX0 - dx;
axis1_.setGeometry (axisX1, axisY1, axisX1 - AXIS1_LENGTH, axisY1);
axis2_.setGeometry (axisX0, axisY0, axisX1, axisY1);
}
}
GText text = axis2_.getText();
text.setText ("position = " + Long.toString (Math.round (position_ * 180.0 / Math.PI)) + ".0");
}
// Make a 6 degree turn
public void rotate()
{
position_ += Math.PI / 60;
if (position_ > Math.PI * 2) position_ -= Math.PI * 2;
draw();
}
}
public static void main (String[] args)
{
new Demo9();
}
}
G-SimpleAnimation.zip( 221 k)
]]>