Ok heres the deal. What I do is I create a LineArray
// class data members
static final int MaxPoints = 425;
int m_nLine = -1; // keep track of points in the line
array
Point3f m_p3 = new Point3f();
// what I do in the function
// I am creating a LineArray with the maximum number of points
// in my case its 425 because I am only displaying data for every minute
// and for the hole day it will not excede 425.
// (I do show the data for every second the data is comming, but only increment the
line every minute)
LineArray line = new LineArray(MaxPoints*2, GeometryArray.COORDINATES
);
line.setCapability(line.ALLOW_COORDINATE_READ);
line.setCapability(line.ALLOW_COORDINATE_WRITE);
draw( line );
Appearance app = new Appearance();
app.setCapability( app.ALLOW_MATERIAL_READ );
app.setCapability( app.ALLOW_MATERIAL_WRITE );
Material material = new Material();
material.setCapability( Material.ALLOW_COMPONENT_WRITE );
material.setLightingEnable( true );
material.setAmbientColor( m_color );
app.setMaterial(material);
m_shape = new Shape3D( line, app );
m_shape.setCapability( Shape3D.ALLOW_APPEARANCE_READ );
m_shape.setCapability( Shape3D.ALLOW_APPEARANCE_WRITE );
m_shape.setCapability( Shape3D.ALLOW_GEOMETRY_READ );
m_shape.setCapability( Shape3D.ALLOW_GEOMETRY_WRITE );
// and later on in my draw function I do this
void draw (LineArray line)
{
m_p3.x = 0;
m_p3.y = m_yBase - m_coords[0]*m_yRatio;
for (int i=1; i<m_counter; i++) {
line.setCoordinate( ++m_nLine, m_p3 );
m_p3.x += m_barWidth;
m_p3.y = m_yBase - m_coords[i]*m_yRatio;
line.setCoordinate( ++m_nLine, m_p3 );
}
}
Now every time the data is comming, after every minute I will increment the line, so
it will become visible. Tell me if you have any further questions
Ahmed
-----Original Message-----
From: Timmy Tong [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, April 03, 2001 7:40 AM
To: [EMAIL PROTECTED]
Subject: [JAVA3D] LineStripArray Update at run time
Dear all,
I am now plotting a 3d graph based on some stock data. I use a
LineStripArray to draw the line. How can I update the line at run time when
some new data arrive?
Thank you very much.
Regards,
Timmy
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