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skplot.cpp
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Wed, Dec 4, 22:34

skplot.cpp
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#include "skplot.h"
#include <QGLShaderProgram>
#include <iostream>
#include "skerror.h"
using namespace std;
using namespace symkit;
const QString SKPlot::vertex_shader = ":/plot_vertex_shader.glsl";
const QString SKPlot::fragment_shader = ":/plot_fragment_shader.glsl";
const QString SKPlot::attrib_vertex = "vertex";
const QString SKPlot::attrib_color = "color";
const char * SKPlot::unif_projection = "projection";
SKPlot::SKPlot(float lineWidth, QWidget * parent)
: QGLWidget(parent),
clearColor( color_s(0.9, 0.9, 0.9)),
initialized(false),
closed(true),
axysRangeUpdateScheduled(false),
lineWidth(lineWidth)
{
shaderProgram = new QGLShaderProgram(context(), this);
axys[0] = SKAxys(2, -1, color_s(0, 0, 1));
axys[1] = SKAxys(2, -1, color_s(0, 1, 0));
}
SKPlot::~SKPlot()
{
delete shaderProgram;
}
void SKPlot::setAxysX(const SKAxys& axys)
{
this->axys[0] = axys;
if (initialized)
updateAxysRange();
}
void SKPlot::setAxysY(const SKAxys& axys)
{
this->axys[1] = axys;
if (initialized)
updateAxysRange();
}
const SKAxys& SKPlot::getAxysX() const
{
return axys[0];
}
const SKAxys& SKPlot::getAxysY() const
{
return axys[1];
}
SKAxys& SKPlot::getAxysX()
{
return axys[0];
}
SKAxys& SKPlot::getAxysY()
{
return axys[1];
}
void SKPlot::setBackgroundColor(const color_s &color)
{
if (initialized)
glClearColor( COLOR_ARGS(color));
clearColor = color;
}
const color_s& SKPlot::getBackgroundColor() const
{
return clearColor;
}
void SKPlot::updateGraph()
{
bindShaderProgram();
updateGL();
releaseShaderProgram();
}
void SKPlot::mousePressEvent(QMouseEvent *)
{
setFocus();
}
void SKPlot::closeEvent(QCloseEvent *event)
{
QGLWidget::closeEvent(event);
closed = true;
}
bool SKPlot::isClosed() const
{
return closed;
}
void SKPlot::initializeGL()
{
cout << "Symplot: initializing OpenGL context" << endl;
if (initialized)
{
cerr << SKError( ERR_INIT,
"symplot.SKPlot",
"SKPlot::initializeGL(void)",
"Plotting window" + this->windowTitle().toStdString() + " already inizialized") << endl;
exit(ERR_INIT);
}
this->initialized = true;
this->closed = false;
cout << "Symplot: OpenGL running in context " << context() << endl;
glClearColor( COLOR_ARGS(clearColor));
Q_INIT_RESOURCE(plot_shaders);
cout << "Symplot: Loading vertex shader: " << vertex_shader.toStdString() << endl;
if ( !shaderProgram->addShaderFromSourceFile(QGLShader::Vertex, vertex_shader) )
{
cerr << SKError(ERR_INIT, "symplot.SKPlot",
"SKPlot::initializeGL(void)",
"Failed loading vertex shader") << endl;
exit(ERR_INIT);
}
cout << "Symplot: Loading fragment shader: " << fragment_shader.toStdString() << endl;
if ( !shaderProgram->addShaderFromSourceFile(QGLShader::Fragment, fragment_shader) )
{
cerr << SKError(ERR_INIT, "symplot.SKPlot",
"SKPlot::initializeGL(void)",
"Failed loading fragment shader") << endl;
exit(ERR_INIT);
}
shaderProgram->bindAttributeLocation(attrib_vertex, AttributeID::vertex);
shaderProgram->bindAttributeLocation(attrib_color, AttributeID::color);
cout << "Symplot: Linking shaders" << endl;
if ( !shaderProgram->link() )
{
cerr << SKError( ERR_INIT,
"symplot.SKPlot",
"SKPlot::initializeGL(void)",
"Failed linking shaders, check for shaders existance") << endl;
exit(ERR_INIT);
}
cout << "Symplot: shader program ID = " << shaderProgram->programId() << endl;
cout << shaderProgram->log().toStdString() << endl;
/* say to symgraph scene that it's ready to start */
emit canStart();
//cout << "Symplot: Binding shaders" << endl;
//bindShaderProgram();
//glEnable(GL_DEPTH_TEST);
//glEnable(GL_CULL_FACE);
glEnable(GL_LINE_SMOOTH);
cout << "Symplot: line width " << lineWidth << endl;
glLineWidth(lineWidth);
/*
* override this function and extend it
* if a 3D environment is implemented
*/
}
void SKPlot::paintGL()
{
glClear(GL_COLOR_BUFFER_BIT);
// clear with background
/* Manage range update */
if (axysRangeUpdateScheduled)
{
updateAxysRange();
axysRangeUpdateScheduled = false;
}
paintAxys(shaderProgram);
paintData(shaderProgram);
//glFlush();
}
void SKPlot::bindShaderProgram()
{
if ( !shaderProgram->bind() )
{
cerr << SKError( ERR_INIT,
"symplot.SKPlot",
"SKPlot::initializeGL(void)",
"Failed binding shader program, check for shaders compatibility") << endl;
exit(ERR_INIT);
}
}
void SKPlot::releaseShaderProgram()
{
shaderProgram->release();
}
#include <QMatrix4x4>
void SKPlot::updateAxysRange()
{
QMatrix4x4 matrix;
cout << "Symplot: Setting ortho system, " << endl
<< " Left: " << axys[0].offset << endl
<< " Right: " << axys[0].offset + axys[0].range << endl
<< " Bottom: " << axys[1].offset << endl
<< " Up: " << axys[1].offset + axys[1].range << endl << endl;
matrix.ortho( axys[0].offset,
axys[0].offset + axys[0].range,
axys[1].offset,
axys[1].offset + axys[1].range,
-1.0f, 1.0f);
//matrix.perspective(60, 1200.0 / 800, 1e-3f, 1e5f);
shaderProgram->setUniformValue(unif_projection, matrix);
}
void SKPlot::resizeGL(int width, int height)
{
cout << "Symplot: resize event, adapting viewport to: "
<< "(" << width << ", " << height << ")" << endl;
bindShaderProgram();
glViewport(0, 0, width, height);
updateAxysRange();
releaseShaderProgram();
}
QObject * SKPlot::getQObject()
{
return this;
}
void SKPlot::scheduleAxysUpdate()
{
axysRangeUpdateScheduled = true;
}
bool SKPlot::isAxysUpdateScheduled() const
{
return axysRangeUpdateScheduled;
}
void SKPlot::setLineWidth(float width)
{
if (initialized)
glLineWidth(width);
lineWidth = width;
}
float SKPlot::getLineWidth() const
{
return lineWidth;
}

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