CubicSDR/src/visual/SpectrumContext.cpp

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#include "SpectrumContext.h"
#include "SpectrumCanvas.h"
#include "CubicSDR.h"
#include <sstream>
#include <iostream>
SpectrumContext::SpectrumContext(SpectrumCanvas *canvas, wxGLContext *sharedContext) :
PrimaryGLContext(canvas, sharedContext), fft_size(0) {
glDisable(GL_CULL_FACE);
glDisable(GL_DEPTH_TEST);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
}
void SpectrumContext::Draw(std::vector<float> &points, int freq, int bandwidth) {
glDisable(GL_TEXTURE_2D);
glColor3f(1.0, 1.0, 1.0);
if (points.size()) {
glPushMatrix();
glTranslatef(-1.0f, -0.75f, 0.0f);
glScalef(2.0f, 1.5f, 1.0f);
glEnableClientState(GL_VERTEX_ARRAY);
glVertexPointer(2, GL_FLOAT, 0, &points[0]);
glDrawArrays(GL_LINE_STRIP, 0, points.size() / 2);
glDisableClientState(GL_VERTEX_ARRAY);
glPopMatrix();
}
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GLint vp[4];
glGetIntegerv( GL_VIEWPORT, vp);
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float viewHeight = (float) vp[3];
float viewWidth = (float) vp[2];
float leftFreq = (float) freq - ((float) bandwidth / 2.0);
float rightFreq = leftFreq + (float) bandwidth;
float firstMhz = floor(leftFreq / 1000000.0) * 1000000.0;
float mhzStart = ((firstMhz - leftFreq) / (rightFreq - leftFreq)) * 2.0;
float mhzStep = (100000.0 / (rightFreq - leftFreq)) * 2.0;
double currentMhz = trunc(floor(firstMhz / 1000000.0));
std::stringstream label;
label.precision(2);
float hPos = 1.0 - (16.0 / viewHeight);
float lMhzPos = 1.0 - (5.0 / viewHeight);
for (float m = -1.0 + mhzStart, mMax = 1.0 + fabs(mhzStart); m <= mMax; m += mhzStep) {
label << std::fixed << currentMhz;
double fractpart, intpart;
fractpart = modf(currentMhz, &intpart);
if (fractpart < 0.001) {
glLineWidth(4.0);
glColor3f(1.0, 1.0, 1.0);
} else {
glLineWidth(1.0);
glColor3f(0.55, 0.55, 0.55);
}
glDisable(GL_TEXTURE_2D);
glBegin(GL_LINES);
glVertex2f(m, lMhzPos);
glVertex2f(m, 1);
glEnd();
getFont(PrimaryGLContext::GLFONT_SIZE12).drawString(label.str(), m, hPos, 12, GLFont::GLFONT_ALIGN_CENTER, GLFont::GLFONT_ALIGN_CENTER);
label.str(std::string());
currentMhz += 0.1f;
}
glLineWidth(1.0);
// getFont(PrimaryGLContext::GLFONT_SIZE16).drawString("Welcome to CubicSDR -- This is a test string. 01234567890!@#$%^&*()_[]",0.0,0.0,16,GLFont::GLFONT_ALIGN_CENTER,GLFont::GLFONT_ALIGN_CENTER);
CheckGLError();
}