CubicSDR/src/visual/SpectrumContext.cpp

#include "SpectrumContext.h"

#include "SpectrumCanvas.h"

SpectrumContext::SpectrumContext(SpectrumCanvas *canvas, wxGLContext *sharedContext) :
        PrimaryGLContext(canvas, sharedContext) {
    glDisable(GL_CULL_FACE);
    glDisable(GL_DEPTH_TEST);

    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();

}

void SpectrumContext::Draw(std::vector<float> &points) {
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();

    glDisable(GL_TEXTURE_2D);

    glColor3f(1.0, 1.0, 1.0);

    if (points.size()) {
        glPushMatrix();
        glTranslatef(-1.0f, -0.9f, 0.0f);
        glScalef(2.0f, 1.8f, 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();
    }

    GLint vp[4];

    glGetIntegerv( GL_VIEWPORT, vp);

    std::string msgStr("Welcome to CubicSDR -- This is a test string. 01234567890!@#$%^&*()_[]");
    float charHeight = 62.0;
    float viewAspect = (float)vp[2]/(float)vp[3];
    float msgWidth = getFont()->getStringWidth(msgStr,charHeight/(float)vp[3],viewAspect);

    getFont()->drawString(msgStr,0.0-(msgWidth/2.0),0.0,charHeight/(float)vp[3],viewAspect);

    CheckGLError();
}