CubicSDR/src/visual/WaterfallCanvas.cpp

#include "WaterfallCanvas.h"

#include "wx/wxprec.h"

#ifndef WX_PRECOMP
#include "wx/wx.h"
#endif

#if !wxUSE_GLCANVAS
#error "OpenGL required: set wxUSE_GLCANVAS to 1 and rebuild the library"
#endif

#include "CubicSDR.h"
#include "CubicSDRDefs.h"
#include "AppFrame.h"
#include <algorithm>

#include <wx/numformatter.h>

#define MIN_BANDWIDTH 1500

wxBEGIN_EVENT_TABLE(WaterfallCanvas, wxGLCanvas)
EVT_PAINT(WaterfallCanvas::OnPaint)
EVT_KEY_DOWN(WaterfallCanvas::OnKeyDown)
EVT_KEY_UP(WaterfallCanvas::OnKeyUp)
EVT_IDLE(WaterfallCanvas::OnIdle)
EVT_MOTION(WaterfallCanvas::OnMouseMoved)
EVT_LEFT_DOWN(WaterfallCanvas::OnMouseDown)
EVT_LEFT_UP(WaterfallCanvas::OnMouseReleased)
EVT_RIGHT_DOWN(WaterfallCanvas::OnMouseRightDown)
EVT_RIGHT_UP(WaterfallCanvas::OnMouseRightReleased)
EVT_LEAVE_WINDOW(WaterfallCanvas::OnMouseLeftWindow)
EVT_ENTER_WINDOW(WaterfallCanvas::OnMouseEnterWindow)
EVT_MOUSEWHEEL(WaterfallCanvas::OnMouseWheelMoved)
wxEND_EVENT_TABLE()

WaterfallCanvas::WaterfallCanvas(wxWindow *parent, int *attribList) :
        InteractiveCanvas(parent, attribList), dragState(WF_DRAG_NONE), nextDragState(WF_DRAG_NONE), fft_size(0), waterfall_lines(0),
        dragOfs(0), mouseZoom(1), zoom(1), hoverAlpha(1.0) {

    glContext = new PrimaryGLContext(this, &wxGetApp().GetContext(this));

    SetCursor(wxCURSOR_CROSS);
}

WaterfallCanvas::~WaterfallCanvas() {
}

void WaterfallCanvas::setup(int fft_size_in, int waterfall_lines_in) {
    if (fft_size == fft_size_in && waterfall_lines_in == waterfall_lines) {
        return;
    }
    fft_size = fft_size_in;
    waterfall_lines = waterfall_lines_in;

    waterfallPanel.setup(fft_size, waterfall_lines);
}

WaterfallCanvas::DragState WaterfallCanvas::getDragState() {
    return dragState;
}

WaterfallCanvas::DragState WaterfallCanvas::getNextDragState() {
    return nextDragState;
}

void WaterfallCanvas::attachSpectrumCanvas(SpectrumCanvas *canvas_in) {
    spectrumCanvas = canvas_in;
}

void WaterfallCanvas::processInputQueue() {
    if (!glContext) {
        return;
    }
    glContext->SetCurrent(*this);
    
    while (!visualDataQueue.empty()) {
        SpectrumVisualData *vData;
        
        visualDataQueue.pop(vData);
        
        if (vData) {
            waterfallPanel.setPoints(vData->spectrum_points);
            waterfallPanel.step();
            vData->decRefCount();
        }
    }
}

void WaterfallCanvas::OnPaint(wxPaintEvent& WXUNUSED(event)) {
//    wxClientDC dc(this);
    wxPaintDC dc(this);

    const wxSize ClientSize = GetClientSize();
    long double currentZoom = zoom;
    
    if (mouseZoom != 1) {
        currentZoom = mouseZoom;
        mouseZoom = mouseZoom + (1.0 - mouseZoom) * 0.2;
        if (fabs(mouseZoom-1.0)<0.01) {
            mouseZoom = 1;
        }
    }
    
    long long bw;
    if (currentZoom != 1) {
        long long freq = wxGetApp().getFrequency();
        bw = getBandwidth();

        double mpos = 0;
        float mouseInView = false;

        if (mouseTracker.mouseInView()) {
            mpos = mouseTracker.getMouseX();
            mouseInView = true;
        } else if (spectrumCanvas && spectrumCanvas->getMouseTracker()->mouseInView()) {
            mpos = spectrumCanvas->getMouseTracker()->getMouseX();
            mouseInView = true;
        }

        if (currentZoom < 1) {
            bw = (long long) ceil((long double) bw * currentZoom);
            if (bw < 30000) {
                bw = 30000;
            }
            if (mouseInView) {
                long long mfreqA = getFrequencyAt(mpos);
                setBandwidth(bw);
                long long mfreqB = getFrequencyAt(mpos);
                centerFreq += mfreqA - mfreqB;
            }
            
            setView(centerFreq, bw);
        } else {
            if (isView) {
                bw = (long long) ceil((long double) bw * currentZoom);

                if (bw >= wxGetApp().getSampleRate()) {
                    disableView();
                    if (spectrumCanvas) {
                        spectrumCanvas->disableView();
                    }
                } else {
                    if (mouseInView) {
                        long long mfreqA = getFrequencyAt(mpos);
                        setBandwidth(bw);
                        long long mfreqB = getFrequencyAt(mpos);
                        centerFreq += mfreqA - mfreqB;
                    } else {
                        setBandwidth(bw);
                    }
                }
            }
        }
        if (centerFreq < freq && (centerFreq - bandwidth / 2) < (freq - wxGetApp().getSampleRate() / 2)) {
            centerFreq = (freq - wxGetApp().getSampleRate() / 2) + bandwidth / 2;
        }
        if (centerFreq > freq && (centerFreq + bandwidth / 2) > (freq + wxGetApp().getSampleRate() / 2)) {
            centerFreq = (freq + wxGetApp().getSampleRate() / 2) - bandwidth / 2;
        }

        if (spectrumCanvas) {
            if ((spectrumCanvas->getCenterFrequency() != centerFreq) || (spectrumCanvas->getBandwidth() != bw)) {
                spectrumCanvas->setView(centerFreq,bw);
            }
        }
    }
    

    glContext->SetCurrent(*this);
    initGLExtensions();
    glViewport(0, 0, ClientSize.x, ClientSize.y);

    glContext->BeginDraw(0,0,0);

    waterfallPanel.calcTransform(CubicVR::mat4::identity());
    waterfallPanel.draw();

    std::vector<DemodulatorInstance *> &demods = wxGetApp().getDemodMgr().getDemodulators();

    DemodulatorInstance *activeDemodulator = wxGetApp().getDemodMgr().getActiveDemodulator();
    DemodulatorInstance *lastActiveDemodulator = wxGetApp().getDemodMgr().getLastActiveDemodulator();

    bool isNew = shiftDown
            || (wxGetApp().getDemodMgr().getLastActiveDemodulator() && !wxGetApp().getDemodMgr().getLastActiveDemodulator()->isActive());

    int currentBandwidth = getBandwidth();
    long long currentCenterFreq = getCenterFrequency();

    ColorTheme *currentTheme = ThemeMgr::mgr.currentTheme;
    int last_type = wxGetApp().getDemodMgr().getLastDemodulatorType();

    if (mouseTracker.mouseInView() || wxGetApp().getDemodMgr().getActiveDemodulator()) {
        hoverAlpha += (1.0f-hoverAlpha)*0.1f;
        if (hoverAlpha > 1.5f) {
            hoverAlpha = 1.5f;
        }
        glContext->setHoverAlpha(hoverAlpha);
        if (nextDragState == WF_DRAG_RANGE) {
            float width = (1.0 / (float) ClientSize.x);
            float rangeWidth = mouseTracker.getOriginDeltaMouseX();
            float centerPos;

            if (mouseTracker.mouseDown()) {
                if (rangeWidth) {
                    width = rangeWidth;
                }
                centerPos = mouseTracker.getOriginMouseX() + width / 2.0;
            } else {
                centerPos = mouseTracker.getMouseX();
            }

            glContext->DrawDemod(lastActiveDemodulator, isNew?currentTheme->waterfallHighlight:currentTheme->waterfallDestroy, currentCenterFreq, currentBandwidth);

            if ((last_type == DEMOD_TYPE_LSB || last_type == DEMOD_TYPE_USB) && mouseTracker.mouseDown()) {
                centerPos = mouseTracker.getMouseX();
                glContext->DrawRangeSelector(centerPos, centerPos-width, isNew?currentTheme->waterfallNew:currentTheme->waterfallHover);
            } else {
                glContext->DrawFreqSelector(centerPos, isNew?currentTheme->waterfallNew:currentTheme->waterfallHover, width, currentCenterFreq, currentBandwidth);
            }
        } else {
            if (lastActiveDemodulator) {
                glContext->DrawDemod(lastActiveDemodulator, ((isNew && activeDemodulator == NULL) || (activeDemodulator != NULL))?currentTheme->waterfallHighlight:currentTheme->waterfallDestroy, currentCenterFreq, currentBandwidth);
            }
            if (activeDemodulator == NULL) {
                glContext->DrawFreqSelector(mouseTracker.getMouseX(), ((isNew && lastActiveDemodulator) || (!lastActiveDemodulator) )?currentTheme->waterfallNew:currentTheme->waterfallHover, 0, currentCenterFreq, currentBandwidth);
            } else {
                glContext->DrawDemod(activeDemodulator, currentTheme->waterfallHover, currentCenterFreq, currentBandwidth);
            }
        }
    } else {
        hoverAlpha += (0.0f-hoverAlpha)*0.05f;
        if (hoverAlpha < 1.0e-5f) {
            hoverAlpha = 0;
        }
        glContext->setHoverAlpha(hoverAlpha);
        if (activeDemodulator) {
            glContext->DrawDemod(activeDemodulator, currentTheme->waterfallHighlight, currentCenterFreq, currentBandwidth);
        }
        if (lastActiveDemodulator) {
            glContext->DrawDemod(lastActiveDemodulator, currentTheme->waterfallHighlight, currentCenterFreq, currentBandwidth);
        }
    }

    glContext->setHoverAlpha(0);

    for (int i = 0, iMax = demods.size(); i < iMax; i++) {
        if (activeDemodulator == demods[i] || lastActiveDemodulator == demods[i]) {
            continue;
        }
        glContext->DrawDemod(demods[i], currentTheme->waterfallHighlight, currentCenterFreq, currentBandwidth);
    }

    glContext->EndDraw();

    SwapBuffers();
}

void WaterfallCanvas::OnKeyUp(wxKeyEvent& event) {
    InteractiveCanvas::OnKeyUp(event);
    shiftDown = event.ShiftDown();
    altDown = event.AltDown();
    ctrlDown = event.ControlDown();
    switch (event.GetKeyCode()) {
    case 'A':
    case WXK_UP:
    case WXK_NUMPAD_UP:
            zoom = 1.0;
            mouseZoom = 0.95;
        break;
    case 'Z':
    case WXK_DOWN:
    case WXK_NUMPAD_DOWN:
            zoom = 1.0;
            mouseZoom = 1.05;
        break;
    }
}

void WaterfallCanvas::OnKeyDown(wxKeyEvent& event) {
    InteractiveCanvas::OnKeyDown(event);

    DemodulatorInstance *activeDemod = wxGetApp().getDemodMgr().getActiveDemodulator();

    long long originalFreq = getCenterFrequency();
    long long freq = originalFreq;

    switch (event.GetKeyCode()) {
    case 'A':
    case WXK_UP:
    case WXK_NUMPAD_UP:
            mouseZoom = 1.0;
            zoom = 0.95;
        break;
    case 'Z':
    case WXK_DOWN:
    case WXK_NUMPAD_DOWN:
            mouseZoom = 1.0;
            zoom = 1.05;
        break;
    case WXK_RIGHT:
    case WXK_NUMPAD_RIGHT:
        if (shiftDown) {
            freq += getBandwidth() * 10;
        } else {
            freq += getBandwidth() / 2;
        }
        break;
    case WXK_LEFT:
    case WXK_NUMPAD_LEFT:
        if (shiftDown) {
            freq -= getBandwidth() * 10;
        } else {
            freq -= getBandwidth() / 2;
        }
        break;
    case 'D':
    case WXK_DELETE:
        if (!activeDemod) {
            break;
        }
        wxGetApp().removeDemodulator(activeDemod);
        wxGetApp().getDemodMgr().deleteThread(activeDemod);
        break;
    case 'M':
        if (!activeDemod) {
            break;
        }
        activeDemod->setMuted(!activeDemod->isMuted());
        break;
    case 'S':
        if (!activeDemod) {
            break;
        }
        if (activeDemod->isStereo()) {
            activeDemod->setStereo(false);
        } else {
            activeDemod->setStereo(true);
        }
        break;
    case 'B':
        if (spectrumCanvas) {
            spectrumCanvas->setShowDb(!spectrumCanvas->getShowDb());
        }
        break;
    case WXK_SPACE:
        wxGetApp().showFrequencyInput();
        break;
    default:
        event.Skip();
        return;
    }

    long long minFreq = wxGetApp().getSampleRate()/2;
    if (freq < minFreq) {
        freq = minFreq;
    }

    if (freq != originalFreq) {
        if (isView) {
            setView(freq, getBandwidth());
            if (spectrumCanvas) {
                spectrumCanvas->setView(freq, getBandwidth());
            }

            long long minFreq = wxGetApp().getFrequency()-(wxGetApp().getSampleRate()/2);
            long long maxFreq = wxGetApp().getFrequency()+(wxGetApp().getSampleRate()/2);

            if (freq < minFreq) {
                wxGetApp().setFrequency(freq+(wxGetApp().getSampleRate()/2));
            }
            if (freq > maxFreq) {
                wxGetApp().setFrequency(freq-(wxGetApp().getSampleRate()/2));
            }
        } else {
            if (spectrumCanvas) {
                spectrumCanvas->setCenterFrequency(freq);
            }
            wxGetApp().setFrequency(freq);
        }
    }

}
void WaterfallCanvas::OnIdle(wxIdleEvent &event) {
    Refresh();
    event.RequestMore();
//    event.Skip();
}

void WaterfallCanvas::OnMouseMoved(wxMouseEvent& event) {
    InteractiveCanvas::OnMouseMoved(event);
    DemodulatorInstance *demod = wxGetApp().getDemodMgr().getActiveDemodulator();

    if (mouseTracker.mouseDown()) {
        if (demod == NULL) {
            return;
        }
        if (dragState == WF_DRAG_BANDWIDTH_LEFT || dragState == WF_DRAG_BANDWIDTH_RIGHT) {

            int bwDiff = (int) (mouseTracker.getDeltaMouseX() * (float) getBandwidth()) * 2;

            if (dragState == WF_DRAG_BANDWIDTH_LEFT) {
                bwDiff = -bwDiff;
            }

            int currentBW = demod->getBandwidth();

            currentBW = currentBW + bwDiff;
            if (currentBW > wxGetApp().getSampleRate()) {
                currentBW = wxGetApp().getSampleRate();
            }
            if (currentBW < MIN_BANDWIDTH) {
                currentBW = MIN_BANDWIDTH;
            }

            demod->setBandwidth(currentBW);
        }

        if (dragState == WF_DRAG_FREQUENCY) {
            long long bwTarget = getFrequencyAt(mouseTracker.getMouseX()) - dragOfs;
            long long currentFreq = demod->getFrequency();
            long long bwDiff = bwTarget - currentFreq;
            int snap = wxGetApp().getFrequencySnap();

            if (snap > 1) {
                bwDiff = roundf((float)bwDiff/(float)snap)*snap;
            }

            if (bwDiff) {
                demod->setFrequency(currentFreq + bwDiff);
                currentFreq = demod->getFrequency();
                demod->updateLabel(currentFreq);
            }
        }
    } else if (mouseTracker.mouseRightDown()) {
        mouseZoom = mouseZoom + ((1.0 - (mouseTracker.getDeltaMouseY() * 4.0)) - mouseZoom) * 0.1;
    } else {
        long long freqPos = getFrequencyAt(mouseTracker.getMouseX());

        std::vector<DemodulatorInstance *> *demodsHover = wxGetApp().getDemodMgr().getDemodulatorsAt(freqPos, 15000);

        wxGetApp().getDemodMgr().setActiveDemodulator(NULL);

        if (altDown) {
            nextDragState = WF_DRAG_RANGE;
            mouseTracker.setVertDragLock(true);
            mouseTracker.setHorizDragLock(false);
            if (shiftDown) {
                setStatusText("Click and drag to create a new demodulator by range.");
            } else {
                setStatusText("Click and drag to set the current demodulator range.");
            }
        } else if (demodsHover->size() && !shiftDown) {
            long near_dist = getBandwidth();

            DemodulatorInstance *activeDemodulator = NULL;

            for (int i = 0, iMax = demodsHover->size(); i < iMax; i++) {
                DemodulatorInstance *demod = (*demodsHover)[i];
                long long freqDiff = demod->getFrequency() - freqPos;
                long halfBw = (demod->getBandwidth() / 2);
                long long currentBw = getBandwidth();
                long long globalBw = wxGetApp().getSampleRate();
                long dist = abs(freqDiff);
                double bufferBw = 10000.0 * ((double)currentBw / (double)globalBw);
                double maxDist = ((double)halfBw + bufferBw);

                if ((double)dist <= maxDist) {
                    if ((freqDiff > 0 && demod->getDemodulatorType() == DEMOD_TYPE_USB) ||
                            (freqDiff < 0 && demod->getDemodulatorType() == DEMOD_TYPE_LSB)) {
                        continue;
                    }

                    if (dist < near_dist) {
                        activeDemodulator = demod;
                        near_dist = dist;
                    }

                    long edge_dist = abs(halfBw - dist);
                    if (edge_dist < near_dist) {
                        activeDemodulator = demod;
                        near_dist = edge_dist;
                    }
                }
            }

            if (activeDemodulator == NULL) {
                nextDragState = WF_DRAG_NONE;
                SetCursor(wxCURSOR_CROSS);
                return;
            }

            wxGetApp().getDemodMgr().setActiveDemodulator(activeDemodulator);

            long long freqDiff = activeDemodulator->getFrequency() - freqPos;

            if (abs(freqDiff) > (activeDemodulator->getBandwidth() / 3)) {

                if (freqDiff > 0) {
                    if (activeDemodulator->getDemodulatorType() != DEMOD_TYPE_USB) {
                        nextDragState = WF_DRAG_BANDWIDTH_LEFT;
                        SetCursor(wxCURSOR_SIZEWE);
                    }
                } else {
                    if (activeDemodulator->getDemodulatorType() != DEMOD_TYPE_LSB) {
                        nextDragState = WF_DRAG_BANDWIDTH_RIGHT;
                        SetCursor(wxCURSOR_SIZEWE);
                    }
                }

                mouseTracker.setVertDragLock(true);
                mouseTracker.setHorizDragLock(false);
                setStatusText("Click and drag to change demodulator bandwidth. SPACE for direct frequency input. M for mute, D to delete, S for stereo.");
            } else {
                SetCursor(wxCURSOR_SIZING);
                nextDragState = WF_DRAG_FREQUENCY;

                mouseTracker.setVertDragLock(true);
                mouseTracker.setHorizDragLock(false);
                setStatusText("Click and drag to change demodulator frequency; SPACE for direct input. M for mute, D to delete, S for stereo.");
            }
        } else {
            SetCursor(wxCURSOR_CROSS);
            nextDragState = WF_DRAG_NONE;
            if (shiftDown) {
                setStatusText("Click to create a new demodulator or hold ALT to drag range, SPACE for direct center frequency input.");
            } else {
                setStatusText(
                        "Click to move active demodulator frequency or hold ALT to drag range; hold SHIFT to create new.  Right drag or A / Z to Zoom.  Arrow keys (+SHIFT) to move center frequency; SPACE for direct input.");
            }
        }

        delete demodsHover;
    }
}

void WaterfallCanvas::OnMouseDown(wxMouseEvent& event) {
    InteractiveCanvas::OnMouseDown(event);

    dragState = nextDragState;

    if (dragState && dragState != WF_DRAG_RANGE) {
        DemodulatorInstance *demod = wxGetApp().getDemodMgr().getActiveDemodulator();
        if (demod) {
            dragOfs = (long long) (mouseTracker.getMouseX() * (float) getBandwidth()) + getCenterFrequency() - (getBandwidth() / 2) - demod->getFrequency();
        }
        wxGetApp().getDemodMgr().setActiveDemodulator(wxGetApp().getDemodMgr().getActiveDemodulator(), false);
    }
}

void WaterfallCanvas::OnMouseWheelMoved(wxMouseEvent& event) {
    InteractiveCanvas::OnMouseWheelMoved(event);
    float movement = (float)event.GetWheelRotation() / (float)event.GetLinesPerAction();

    mouseZoom = 1.0f - movement/1000.0f;
}

void WaterfallCanvas::OnMouseReleased(wxMouseEvent& event) {
    InteractiveCanvas::OnMouseReleased(event);

    bool isNew = shiftDown || (wxGetApp().getDemodMgr().getLastActiveDemodulator() == NULL)
            || (wxGetApp().getDemodMgr().getLastActiveDemodulator() && !wxGetApp().getDemodMgr().getLastActiveDemodulator()->isActive());

    mouseTracker.setVertDragLock(false);
    mouseTracker.setHorizDragLock(false);

    DemodulatorInstance *demod = isNew?NULL:wxGetApp().getDemodMgr().getLastActiveDemodulator();
    DemodulatorInstance *activeDemod = isNew?NULL:wxGetApp().getDemodMgr().getActiveDemodulator();

    DemodulatorMgr *mgr = &wxGetApp().getDemodMgr();

    if (mouseTracker.getOriginDeltaMouseX() == 0 && mouseTracker.getOriginDeltaMouseY() == 0) {
        float pos = mouseTracker.getMouseX();
        long long input_center_freq = getCenterFrequency();
        long long freqTarget = input_center_freq - (long long) (0.5 * (float) getBandwidth()) + (long long) ((float) pos * (float) getBandwidth());
        long long demodFreq = demod?demod->getFrequency():freqTarget;
        long long bwDiff = freqTarget - demodFreq;
        long long freq = demodFreq;

         int snap = wxGetApp().getFrequencySnap();

         if (snap > 1) {
             if (demod) {
                 bwDiff = roundf((double)bwDiff/(double)snap)*snap;
                 freq += bwDiff;
             } else {
                 freq = roundl((long double)freq/(double)snap)*snap;
             }
         } else {
             freq += bwDiff;
         }


        if (dragState == WF_DRAG_NONE) {
            if (!isNew && wxGetApp().getDemodMgr().getDemodulators().size()) {
                demod = wxGetApp().getDemodMgr().getLastActiveDemodulator();
            } else {
                isNew = true;
                demod = wxGetApp().getDemodMgr().newThread();
                demod->setFrequency(freq);

                demod->setDemodulatorType(mgr->getLastDemodulatorType());
                demod->setBandwidth(mgr->getLastBandwidth());
                demod->setSquelchLevel(mgr->getLastSquelchLevel());
                demod->setSquelchEnabled(mgr->isLastSquelchEnabled());
                demod->setStereo(mgr->isLastStereo());
                demod->setGain(mgr->getLastGain());

                demod->run();

                wxGetApp().bindDemodulator(demod);
            }

            if (!demod) {
                dragState = WF_DRAG_NONE;
                return;
            }

            demod->updateLabel(freq);
            demod->setFrequency(freq);

            if (isNew) {
                setStatusText("New demodulator at frequency: %s", freq);
            } else {
                setStatusText("Moved demodulator to frequency: %s", freq);
            }

            wxGetApp().getDemodMgr().setActiveDemodulator(demod, false);
            SetCursor(wxCURSOR_SIZING);
            nextDragState = WF_DRAG_FREQUENCY;
            mouseTracker.setVertDragLock(true);
            mouseTracker.setHorizDragLock(false);
        } else {
            if (activeDemod) {
                wxGetApp().getDemodMgr().setActiveDemodulator(activeDemod, false);
                activeDemod->setTracking(true);
                nextDragState = WF_DRAG_FREQUENCY;
            } else {
                nextDragState = WF_DRAG_NONE;
            }
        }
    } else if (dragState == WF_DRAG_RANGE) {
        float width = mouseTracker.getOriginDeltaMouseX();

        float pos;
        int last_type = mgr->getLastDemodulatorType();

        if (last_type == DEMOD_TYPE_LSB || last_type == DEMOD_TYPE_USB) {
            float pos1 = mouseTracker.getOriginMouseX();
            float pos2 = mouseTracker.getMouseX();

            if (pos2 < pos1) {
                float tmp = pos1;
                pos1 = pos2;
                pos2 = tmp;
            }

            pos = (last_type == DEMOD_TYPE_LSB)?pos2:pos1;
            width *= 2;
        } else {
            pos = mouseTracker.getOriginMouseX() + width / 2.0;
        }

        long long input_center_freq = getCenterFrequency();
        long long freq = input_center_freq - (long long) (0.5 * (float) getBandwidth()) + (long long) ((float) pos * (float) getBandwidth());
        unsigned int bw = (unsigned int) (fabs(width) * (float) getBandwidth());

        if (bw < MIN_BANDWIDTH) {
            bw = MIN_BANDWIDTH;
        }

        if (!bw) {
            dragState = WF_DRAG_NONE;
            return;
        }

        int snap = wxGetApp().getFrequencySnap();

        if (snap > 1) {
            freq = roundl((long double)freq/(double)snap)*snap;
        }


        if (!isNew && wxGetApp().getDemodMgr().getDemodulators().size()) {
            demod = wxGetApp().getDemodMgr().getLastActiveDemodulator();
        } else {
            demod = wxGetApp().getDemodMgr().newThread();
            demod->setFrequency(freq);
            demod->setDemodulatorType(mgr->getLastDemodulatorType());
            demod->setBandwidth(bw);
            demod->setSquelchLevel(mgr->getLastSquelchLevel());
            demod->setSquelchEnabled(mgr->isLastSquelchEnabled());
            demod->setStereo(mgr->isLastStereo());
            demod->setGain(mgr->getLastGain());

            demod->run();

            wxGetApp().bindDemodulator(demod);
        }

        if (demod == NULL) {
            dragState = WF_DRAG_NONE;
            return;
        }

        setStatusText("New demodulator at frequency: %s", freq);

        demod->updateLabel(freq);
        demod->setFrequency(freq);
        demod->setBandwidth(bw);
        wxGetApp().getDemodMgr().setActiveDemodulator(demod, false);
    }

    dragState = WF_DRAG_NONE;
}

void WaterfallCanvas::OnMouseLeftWindow(wxMouseEvent& event) {
    InteractiveCanvas::OnMouseLeftWindow(event);
    SetCursor(wxCURSOR_CROSS);
    wxGetApp().getDemodMgr().setActiveDemodulator(NULL);
    mouseZoom = 1.0;
}

void WaterfallCanvas::OnMouseEnterWindow(wxMouseEvent& event) {
    InteractiveCanvas::OnMouseEnterWindow(event);
    SetCursor(wxCURSOR_CROSS);
}

void WaterfallCanvas::OnMouseRightDown(wxMouseEvent& event) {
    InteractiveCanvas::OnMouseRightDown(event);

    SetCursor(wxCURSOR_SIZENS);
    mouseTracker.setVertDragLock(true);
    mouseTracker.setHorizDragLock(true);
}

void WaterfallCanvas::OnMouseRightReleased(wxMouseEvent& event) {
    InteractiveCanvas::OnMouseRightReleased(event);
    SetCursor(wxCURSOR_CROSS);
    mouseTracker.setVertDragLock(false);
    mouseTracker.setHorizDragLock(false);
    mouseZoom = 1.0;
}

SpectrumVisualDataQueue *WaterfallCanvas::getVisualDataQueue() {
    return &visualDataQueue;
}