प्रयोगशाला 3" on hiwikiversity

{{कंप्यूटर ग्राफिक्स -- 2013-2014 -- info.uvt.ro/पेज हैडर}}


=== एंटीअलियासिंग (Antialising) ===

* '''रंग ब्लेंडिंग (Color Blending)''' -

<source lang="Java">

	[...]

	public void init(GLAutoDrawable canvas)
	{

		[...]

		// Activate the GL_LINE_SMOOTH state variable. Other options include 
		// GL_POINT_SMOOTH and GL_POLYGON_SMOOTH.
		gl.glEnable(GL.GL_LINE_SMOOTH);

		// Activate the GL_BLEND state variable. Means activating blending.
		gl.glEnable(GL.GL_BLEND);

		// Set the blend function. For antialiasing it is set to GL_SRC_ALPHA for the source
		// and GL_ONE_MINUS_SRC_ALPHA for the destination pixel.
		gl.glBlendFunc(GL.GL_SRC_ALPHA, GL.GL_ONE_MINUS_SRC_ALPHA);

		// Control GL_LINE_SMOOTH_HINT by applying the GL_DONT_CARE behavior. 
		// Other behaviours include GL_FASTEST or GL_NICEST.
		gl.glHint(GL.GL_LINE_SMOOTH_HINT, GL.GL_DONT_CARE);
		// Uncomment the following two lines in case of polygon antialiasing
		//gl.glEnable(GL.GL_POLYGON_SMOOTH);
		//glHint(GL_POLYGON_SMOOTH_HINT, GL_NICEST);

	}

	public void display(GLAutoDrawable canvas) {
		GL2 gl = canvas.getGL().getGL2();

		[...]
		
		gl.glLineWidth(1.5f);
	
		gl.glColor3f(1.f, 0.f, 0.f);
		gl.glBegin(GL2.GL_LINES);
			gl.glVertex2f(0.2f, 0.2f);
			gl.glVertex2f(0.9f, 0.9f);			
		gl.glEnd();
		
		gl.glColor3f(0.f, 1.f, 0.f);
		gl.glBegin(GL2.GL_LINES);
			gl.glVertex2f(0.9f, 0.2f);
			gl.glVertex2f(0.2f, 0.9f);
		gl.glEnd();
		[...]
	}

	[...]

</source>

=== बहुभुज(Polygons) ===


==== वैधता(Validity) ====

==== बहुभुज का निर्माण ब्लॉक (Building blocks of polyons) ====

==== आयामी (Dimensionality) ====

==== प्रिमिटिवस (Primitives) ====

<source lang="java">
public class MainFrame
{
	[...]

	public void display(GLAutoDrawable canvas) {
		GL2 gl = canvas.getGL().getGL2();

		[...]

		gl.glBegin(GL2.GL_POLYGON);
			gl.glColor3f(1.f, 0.f, 0.f);
			gl.glVertex2f(0.2f, 0.2f);
			gl.glColor3f(0.f, 1.f, 0.f);
			gl.glVertex2f(0.2f, 0.4f);
			gl.glColor3f(0.f, 0.f, 1.f);
			gl.glVertex2f(0.4f, 0.4f);
			gl.glColor3f(1.f, 1.f, 1.f);
			gl.glVertex2f(0.4f, 0.2f);
		gl.glEnd();

		[...]
	}

	[...]
}
</source>

लिंक:
* [http://www.felixgers.de/teaching/jogl/polygonPrimitives.html बहुभुज प्रिमिटिवस]

=== बहुभुज भरने और ओरिएंटेशन (Polygon filling and orientation) ===
<source lang="java">
public class MainFrame
{
	[...]

	public void display(GLAutoDrawable canvas) {
		GL2 gl = canvas.getGL().getGL2();

		[...]

		// Do not render front-faced polygons.
		gl.glCullFace(GL.GL_FRONT);
		// Culling must be enabled in order to work.
		gl.glEnable(GL.GL_CULL_FACE);		

		gl.glPolygonMode(GL.GL_FRONT_AND_BACK, GL.GL_FILL);

		// Define vertices in clockwise order (back-faced)
		gl.glBegin(GL2.GL_POLYGON);
			gl.glColor3f(1.f, 0.f, 0.f);
			gl.glVertex2f(0.2f, 0.2f);
			gl.glColor3f(0.f, 1.f, 0.f);
			gl.glVertex2f(0.2f, 0.4f);
			gl.glColor3f(0.f, 0.f, 1.f);
			gl.glVertex2f(0.4f, 0.4f);
			gl.glColor3f(1.f, 1.f, 1.f);
			gl.glVertex2f(0.4f, 0.2f);
		gl.glEnd();

		[...]
	}

	[...]
}
</source>

<source lang="java">
public class MainFrame
{
	[...]

	public void display(GLAutoDrawable canvas) {
		GL2 gl = canvas.getGL().getGL2();

		[...]

		// Do not render back-faced polygons.
		gl.glCullFace(GL.GL_BACK);
		// Culling must be enabled in order to work.
		gl.glEnable(GL.GL_CULL_FACE);		

		gl.glPolygonMode(GL.GL_FRONT_AND_BACK, GL.GL_FILL);

		// Define vertices in clockwise order (back-faced).
		gl.glBegin(GL2.GL_POLYGON);
			gl.glColor3f(1.f, 0.f, 0.f);
			gl.glVertex2f(0.2f, 0.2f);
			gl.glColor3f(0.f, 1.f, 0.f);
			gl.glVertex2f(0.2f, 0.4f);
			gl.glColor3f(0.f, 0.f, 1.f);
			gl.glVertex2f(0.4f, 0.4f);
			gl.glColor3f(1.f, 1.f, 1.f);
			gl.glVertex2f(0.4f, 0.2f);
		gl.glEnd();

		[...]
	}

	[...]
}
</source>

=== बहुभुज स्टिपल (Polygon stipple) ===

<source lang="java">
public class MainFrame
{

	[...]
	byte mask[] = {
        	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
	 0x03, (byte)0x80, 0x01, (byte)0xC0, 0x06, (byte)0xC0, 0x03, 0x60, 

	 0x04, 0x60, 0x06, 0x20, 0x04, 0x30, 0x0C, 0x20, 
	 0x04, 0x18, 0x18, 0x20, 0x04, 0x0C, 0x30, 0x20,
	 0x04, 0x06, 0x60, 0x20, 0x44, 0x03, (byte)0xC0, 0x22, 
	 0x44, 0x01, (byte)0x80, 0x22, 0x44, 0x01, (byte)0x80, 0x22, 
	 0x44, 0x01, (byte)0x80, 0x22, 0x44, 0x01, (byte)0x80, 0x22,
	 0x44, 0x01, (byte)0x80, 0x22, 0x44, 0x01, (byte)0x80, 0x22, 
	 0x66, 0x01, (byte)0x80, 0x66, 0x33, 0x01, (byte)0x80, (byte)0xCC, 

	 0x19, (byte)0x81, (byte)0x81, (byte)0x98, 0x0C, (byte)0xC1, (byte)0x83, 0x30,
	 0x07, (byte)0xe1, (byte)0x87, (byte)0xe0, 0x03, 0x3f, (byte)0xfc, (byte)0xc0, 
	 0x03, 0x31, (byte)0x8c, (byte)0xc0, 0x03, 0x33, (byte)0xcc, (byte)0xc0, 
	 0x06, 0x64, 0x26, 0x60, 0x0c, (byte)0xcc, 0x33, 0x30,
	 0x18, (byte)0xcc, 0x33, 0x18, 0x10, (byte)0xc4, 0x23, 0x08, 
	 0x10, 0x63, (byte)0xC6, 0x08, 0x10, 0x30, 0x0c, 0x08, 
	 0x10, 0x18, 0x18, 0x08, 0x10, 0x00, 0x00, 0x08};

	public void display(GLAutoDrawable canvas) {
		GL2 gl = canvas.getGL().getGL2();

		gl.glPolygonMode(GL.GL_FRONT_AND_BACK, GL2.GL_FILL);

		// Set the polygon mask.
		gl.glPolygonStipple (mask, 0);
		// Enable polygon stipple.
		gl.glEnable (GL2.GL_POLYGON_STIPPLE);

		// Define vertices in clockwise order (back-faced).
		gl.glBegin(GL2.GL_POLYGON);
			gl.glColor3f(1.f, 0.f, 0.f);
			gl.glVertex2f(0.2f, 0.2f);
			gl.glColor3f(0.f, 1.f, 0.f);
			gl.glVertex2f(0.2f, 0.4f);
			gl.glColor3f(0.f, 0.f, 1.f);
			gl.glVertex2f(0.4f, 0.4f);
			gl.glColor3f(1.f, 1.f, 1.f);
			gl.glVertex2f(0.4f, 0.2f);
		gl.glEnd();

		// Disable polygon stipple.
		gl.glDisable (GL2.GL_POLYGON_STIPPLE);

		[...]
	}

	[...]
}
</source>

=== बहुभुज नार्मल (Polygon normals) ===
<source lang="java">
public class MainFrame
{
    [...]

    public void display(GLAutoDrawable canvas) {
        GL2 gl = canvas.getGL().getGL2();

        [...]

        // Do not render front-faced polygons.
        gl.glCullFace(GL.GL_FRONT);
        // Culling must be enabled in order to work.
        gl.glEnable(GL.GL_CULL_FACE);        

        gl.glPolygonMode(GL.GL_FRONT_AND_BACK, GL.GL_FILL);

        // Define vertices in clockwise order (back-faced).
        gl.glBegin(GL2.GL_POLYGON);
            // Define normal for vertex 1
            gl.glNormal3f(0.f, 0.f, 1.f);
            gl.glColor3f(1.f, 0.f, 0.f);
            gl.glVertex2f(0.2f, 0.2f);

            // Define normal for vertex 2
            gl.glNormal3f(0.f, 0.f, 1.f);
            gl.glColor3f(0.f, 1.f, 0.f);
            gl.glVertex2f(0.2f, 0.4f);

            // Define normal for vertex 3
            gl.glNormal3f(0.f, 0.f, 1.f);
            gl.glColor3f(0.f, 0.f, 1.f);
            gl.glVertex2f(0.4f, 0.4f);

            // Define normal for vertex 4
            gl.glNormal3f(0.f, 0.f, 1.f);
            gl.glColor3f(1.f, 1.f, 1.f);
            gl.glVertex2f(0.4f, 0.2f);
        gl.glEnd();

        [...]
    }

    [...]
}
</source>
==== बम्प मैपिंग प्राइमर (Bump mapping primer) ====

=== बिल्डिंग डिस्प्ले सूचियाँ (Building Display Lists) ===
<source lang="java">
public class MainFrame
{
    [...]

    int aCircle;

    public void init(GLAutoDrawable canvas)
    {

        [...]

        // Generate a unique ID for our list.
        aCircle = gl.glGenLists(1);

        // Generate the Display List
        gl.glNewList(aCircle, GL2.GL_COMPILE);
            drawCircle(gl, 0.5f, 0.5f, 0.4f);
        gl.glEndList();

    }

    int aCircle;

    public void display(GLAutoDrawable canvas) {
        GL2 gl = canvas.getGL().getGL2();

        [...]

        gl.glColor3f(1.0f, 1.0f, 1.0f);
        // Call the Display List i.e. call the commands stored in it.
        gl.glCallList(aCircle);

    }

    // Here we define the function for building a circle from line segments.
    private void drawCircle(GL gl, float xCenter, float yCenter, float radius) {

        double x,y, angle;

        gl.glBegin(GL2.GL_LINE_LOOP);
        for (int i=0; i<360; i++) {
            angle = Math.toRadians(i);
            x = radius * Math.cos(angle);
            y = radius * Math.sin(angle);
            gl.glVertex2d(xCenter + x, yCenter + y);
        }
        gl.glEnd();

    }
    [...]
}
</source>


== एपीआई (API) ==

* [http://download.java.net/media/jogl/builds/nightly/javadoc_public/javax/media/opengl/package-summary.html java.media.opengl];
** [http://download.java.net/media/jogl/builds/nightly/javadoc_public/javax/media/opengl/GL.html GL];
** [http://download.java.net/media/jogl/builds/nightly/javadoc_public/javax/media/opengl/GL.html#glPolygonMode(int,%20int) glPolygonMode(int, int)];
** [http://download.java.net/media/jogl/builds/nightly/javadoc_public/javax/media/opengl/GL.html#glRectd(double,%20double,%20double,%20double) glRect(double, double, double, double)];
** [http://www.opengl.org/sdk/docs/man/xhtml/glPolygonStipple.xml glPolygonStipple(ByteBuffer)];
** [http://download.java.net/media/jogl/builds/nightly/javadoc_public/javax/media/opengl/GL.html#glCullFace(int) glCullFace(int)];
** [http://download.java.net/media/jogl/builds/nightly/javadoc_public/javax/media/opengl/GL.html#glFrontFace(int) glFrontFace(int)];
** [http://download.java.net/media/jogl/builds/nightly/javadoc_public/javax/media/opengl/GL.html#glNormal3f(float,%20float,%20float) glNormal3f(float, float, float)];
** [http://download.java.net/media/jogl/builds/nightly/javadoc_public/javax/media/opengl/GL.html#glGenLists(int) glGenLists(int)];
** [http://download.java.net/media/jogl/builds/nightly/javadoc_public/javax/media/opengl/GL.html#glNewList(int,%20int) glNewList(int, int)];
** [http://download.java.net/media/jogl/builds/nightly/javadoc_public/javax/media/opengl/GL.html#glEndList() glEndList()];



== अभ्यास (Exercises) ==

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[[Category:कंप्यूटर ग्राफिक्स]]
[[Category:ग्राफिक्स]]
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