Interactive Mandelbrot viewer with Qt and OpenGL.
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#include <QImage>
#include <iostream>
#include <QOpenGLWidget>
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#include "../headers/Mandelbrot.h"
void Mandelbrot::init(GLuint vaoId) {
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initializeOpenGLFunctions();
vao = vaoId;
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}
void Mandelbrot::draw() {
glClear(GL_COLOR_BUFFER_BIT);
shader.bind();
setShaderValues();
glBindVertexArray(vao);
glDrawArrays(GL_TRIANGLES, 0, 6);
glBindVertexArray(0);
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}
void Mandelbrot::updateAnimation() {
if (!animating)
return;
hueAdd += 1;
hueAdd -= hueAdd >= 360 ? 360 : 0;
}
void Mandelbrot::toggleAnimation() {
animating = !animating;
}
bool Mandelbrot::initShader() {
if (!shader.addShaderFromSourceFile(QOpenGLShader::Vertex, ":/Vertex.glsl")) return false;
if (!shader.addShaderFromSourceFile(QOpenGLShader::Fragment, ":/Fragment.glsl")) return false;
if (!shader.link()) return false;
if (!shader.bind()) return false;
return true;
}
void Mandelbrot::setShaderValues() {
shader.setUniformValue("origin", origin);
shader.setUniformValue("size", size);
shader.setUniformValue("maxIterationsCount", maxIterations);
shader.setUniformValue("hueAdd", hueAdd);
shader.setUniformValue("normalize", normalize);
}
void Mandelbrot::zoomRelative(int direction, QVector2D posRelative) {
float modifier = direction < 0 ? zoomModifier : (1 / zoomModifier);
QVector2D newSize = size * modifier;
QVector2D fixPos = origin + posRelative * size;
QVector2D newOrigin = fixPos - posRelative * newSize;
size = newSize;
origin = newOrigin;
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}
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void Mandelbrot::setMaxIterations(int value) {
maxIterations = value;
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}
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void Mandelbrot::translateRelative(QVector2D relative) {
QVector2D absolute = relative * size;
origin -= absolute;
}
void Mandelbrot::resizeRelative(QVector2D relative) {
size *= relative;
}
void Mandelbrot::toggleNormalize() {
normalize = !normalize;
}
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void Mandelbrot::initView(QSize startSize) {
int viewW = startSize.width();
int viewH = startSize.height();
float ratio = float(viewW) / float(viewH);
if (ratio > 1){
size = {startMaxSize, startMaxSize / ratio};
} else {
size = {startMaxSize * ratio, startMaxSize};
}
origin = startCenter - size / 2;
}
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