glanalyzer.cpp

Amarok是一款在LINUX或其他类UNIX操作系统中运行的音频播放器软件。 经过两年开发后

/***************************************************************************
                          gloscope.cpp  -  description
                             -------------------
    begin                : Jan 17 2004
    copyright            : (C) 2004 by Adam Pigg
    email                : [e-mail]
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/

#include <config.h>

#ifdef HAVE_QGLWIDGET

#include <cmath>
#include "glanalyzer.h"
#include <kdebug.h>


GLAnalyzer::GLAnalyzer( QWidget *parent )
        : Analyzer::Base3D(parent, 15)
        , m_oldy(32, -10.0f)
        , m_peaks(32)
{}

GLAnalyzer::~GLAnalyzer()
{}

// METHODS =====================================================

void GLAnalyzer::analyze( const Scope &s )
{
	//kdDebug() << "Scope Size: " << s.size() << endl;
        /* Scope t(32);
	if (s.size() != 32)
	{
		Analyzer::interpolate(s, t);
	}
	else
	{
		t = s;
	}*/
        uint offset = 0;
        static float peak;
        float mfactor = 0.0;
        static int drawcount;

        if (s.size() == 64)
        {
            offset=8;
        }

	glRotatef(0.25f, 0.0f, 1.0f, 0.5f); //Rotate the scene
	drawFloor();
	drawcount++;
        if (drawcount > 25)
        {
            drawcount = 0;
            peak = 0.0;
        }

        for ( uint i = 0; i < 32; i++ )
	{
            if (s[i] > peak)
            {
                peak = s[i];
            }
        }

        mfactor = 20 / peak;
        for ( uint i = 0; i < 32; i++ )
	{

                //kdDebug() << "Scope item " << i << " value: " << s[i] << endl;

                // Calculate new horizontal position (x) depending on number of samples
		x = -16.0f + i;

		// Calculating new vertical position (y) depending on the data passed by amarok
		y = float(s[i+offset] * mfactor); //This make it kinda dynamically resize depending on the data

		//Some basic bounds checking
		if (y > 30)
			y = 30;
		else if (y < 0)
			y = 0;

		if((y - m_oldy[i]) < -0.6f) // Going Down Too Much
		{
			y = m_oldy[i] - 0.7f;
		}
		if (y < 0.0f)
		{
			y = 0.0f;
		}

		m_oldy[i] = y; //Save value as last value

		//Peak Code
		if (m_oldy[i] > m_peaks[i].level)
		{
			m_peaks[i].level = m_oldy[i];
			m_peaks[i].delay = 30;
		}

		if (m_peaks[i].delay > 0)
		{
			m_peaks[i].delay--;
		}

		if (m_peaks[i].level > 1.0f)
		{
			if (m_peaks[i].delay <= 0)
			{
				m_peaks[i].level-=0.4f;
			}
		}
		// Draw the bar
		drawBar(x,y);
		drawPeak(x, m_peaks[i].level);

  	}

	updateGL();
}

void GLAnalyzer::initializeGL()
{
	// Clear frame (next fading will be preferred to clearing)
	glClearColor(0.0f, 0.0f, 0.0f, 1.0f);// Set clear color to black
        glClear( GL_COLOR_BUFFER_BIT );

	// Set the shading model
	glShadeModel(GL_SMOOTH);

	// Set the polygon mode to fill
	glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);

	// Enable depth testing for hidden line removal
	glEnable(GL_DEPTH_TEST);

	// Set blend parameters for 'composting alpha'
	glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
}

void GLAnalyzer::resizeGL( int w, int h )
{
    glViewport( 0, 0, (GLint)w, (GLint)h );
    glMatrixMode( GL_PROJECTION );
    glLoadIdentity();
    glOrtho(-16.0f, 16.0f, -10.0f, 10.0f, -50.0f, 100.0f);
    glMatrixMode( GL_MODELVIEW );
    glLoadIdentity();
}

void GLAnalyzer::paintGL()
{
        glMatrixMode( GL_MODELVIEW );
#if 0
        glClear( GL_COLOR_BUFFER_BIT |  GL_DEPTH_BUFFER_BIT );
#else
        glEnable( GL_DEPTH_TEST );
        glEnable( GL_BLEND );
        glPushMatrix();
        glLoadIdentity();
        glBegin( GL_TRIANGLE_STRIP );
          glColor4f( 0.0f, 0.0f, 0.1f, 0.08f );
          glVertex2f( 20.0f, 10.0f );
          glVertex2f( -20.0f, 10.0f );
          glVertex2f( 20.0f, -10.0f );
          glVertex2f( -20.0f, -10.0f );
        glEnd();
        glPopMatrix();
        glDisable( GL_BLEND );
        glEnable( GL_DEPTH_TEST );
        glClear( GL_DEPTH_BUFFER_BIT );
#endif
	//swapBuffers();

        glFlush();

}

void GLAnalyzer::drawBar(float xPos, float height)
{
        glPushMatrix();

        //Sets color to blue
	//Set the colour depending on the height of the bar
	glColor3f((height/40) + 0.5f, (height/40) + 0.625f, 1.0f);
        glTranslatef(xPos, -10.0f, 0.0f);

        glScalef(1.0f, height, 3.0f);
        drawCube();

	//Set colour to full blue
	//glColor3f(0.0f, 0.0f, 1.0f);
	//drawFrame();
        glPopMatrix();
}

void GLAnalyzer::drawFloor()
{
        glPushMatrix();

        //Sets color to amarok blue
	glColor3f( 0.5f, 0.625f, 1.0f);
        glTranslatef(-16.0f,-11.0f, -4.0f);

        glScalef(32.0f, 1.0f, 10.0f);
        drawCube();

	//Set colour to full blue
	glColor3f(0.0f, 0.0f, 1.0f);
        drawFrame();
        glPopMatrix();
}

void GLAnalyzer::drawPeak(float xPos, float ypos)
{
        glPushMatrix();

        //Set the colour to red
	glColor3f(1.0f, 0.0f, 0.0f);
        glTranslatef(xPos, ypos - 10.0f, 0.0f);

        glScalef(1.0f, 1.0f, 3.0f);
        drawCube();

        glPopMatrix();
}

void GLAnalyzer::drawCube()
{
        glPushMatrix();
        glBegin(GL_POLYGON);

	//This is the top face
	glVertex3f(0.0f, 1.0f, 0.0f);
	glVertex3f(1.0f, 1.0f, 0.0f);
	glVertex3f(1.0f, 1.0f, 1.0f);
	glVertex3f(0.0f, 1.0f, 1.0f);
	glVertex3f(0.0f, 1.0f, 0.0f);

	//This is the front face
	glVertex3f(0.0f, 0.0f, 0.0f);
	glVertex3f(1.0f, 0.0f, 0.0f);
	glVertex3f(1.0f, 1.0f, 0.0f);
	glVertex3f(0.0f, 1.0f, 0.0f);
	glVertex3f(0.0f, 0.0f, 0.0f);

	//This is the right face
	glVertex3f(1.0f, 0.0f, 0.0f);
	glVertex3f(1.0f, 0.0f, 1.0f);
	glVertex3f(1.0f, 1.0f, 1.0f);
	glVertex3f(1.0f, 1.0f, 0.0f);
	glVertex3f(1.0f, 0.0f, 0.0f);

	//This is the left face
	glVertex3f(0.0f, 0.0f, 0.0f);
	glVertex3f(0.0f, 0.0f, 1.0f);
	glVertex3f(0.0f, 1.0f, 1.0f);
	glVertex3f(0.0f, 1.0f, 0.0f);
	glVertex3f(0.0f, 0.0f, 0.0f);

	//This is the bottom face
	glVertex3f(0.0f, 0.0f, 0.0f);
	glVertex3f(1.0f, 0.0f, 0.0f);
	glVertex3f(1.0f, 0.0f, 1.0f);
	glVertex3f(0.0f, 0.0f, 1.0f);
	glVertex3f(0.0f, 0.0f, 0.0f);

	//This is the back face
	glVertex3f(0.0f, 0.0f, 1.0f);
	glVertex3f(1.0f, 0.0f, 1.0f);
	glVertex3f(1.0f, 1.0f, 1.0f);
	glVertex3f(0.0f, 1.0f, 1.0f);
	glVertex3f(0.0f, 0.0f, 1.0f);

        glEnd();
        glPopMatrix();
}
void GLAnalyzer::drawFrame()
{
        glPushMatrix();
        glBegin(GL_LINES);


	//This is the top face
	glVertex3f(0.0f, 1.0f, 0.0f);
	glVertex3f(1.0f, 1.0f, 0.0f);
	glVertex3f(1.0f, 1.0f, 1.0f);
	glVertex3f(0.0f, 1.0f, 1.0f);
	glVertex3f(0.0f, 1.0f, 0.0f);

	//This is the front face
	glVertex3f(0.0f, 0.0f, 0.0f);
	glVertex3f(1.0f, 0.0f, 0.0f);
	glVertex3f(1.0f, 1.0f, 0.0f);
	glVertex3f(0.0f, 1.0f, 0.0f);
	glVertex3f(0.0f, 0.0f, 0.0f);

	//This is the right face
	glVertex3f(1.0f, 0.0f, 0.0f);
	glVertex3f(1.0f, 0.0f, 1.0f);
	glVertex3f(1.0f, 1.0f, 1.0f);
	glVertex3f(1.0f, 1.0f, 0.0f);
	glVertex3f(1.0f, 0.0f, 0.0f);

	//This is the left face
	glVertex3f(0.0f, 0.0f, 0.0f);
	glVertex3f(0.0f, 0.0f, 1.0f);
	glVertex3f(0.0f, 1.0f, 1.0f);
	glVertex3f(0.0f, 1.0f, 0.0f);
	glVertex3f(0.0f, 0.0f, 0.0f);

	//This is the bottom face
	glVertex3f(0.0f, 0.0f, 0.0f);
	glVertex3f(1.0f, 0.0f, 0.0f);
	glVertex3f(1.0f, 0.0f, 1.0f);
	glVertex3f(0.0f, 0.0f, 1.0f);
	glVertex3f(0.0f, 0.0f, 0.0f);

	//This is the back face
	glVertex3f(0.0f, 0.0f, 1.0f);
	glVertex3f(1.0f, 0.0f, 1.0f);
	glVertex3f(1.0f, 1.0f, 1.0f);
	glVertex3f(0.0f, 1.0f, 1.0f);
	glVertex3f(0.0f, 0.0f, 1.0f);

        glEnd();
        glPopMatrix();
}

#endif