Method draw

src/MultiGraph.cpp:50–152

Vector2i MultiGraph::preferred_size_impl(NVGcontext*) const { return Vector2i(180, 80); }

void MultiGraph::draw(NVGcontext* ctx) {
    Widget::draw(ctx);

    NVGpaint bg = nvgBoxGradient(ctx, m_pos.x() + 1, m_pos.y() + 1 + 1.0f, m_size.x() - 2, m_size.y() - 2, 3, 4, Color(120, 32), Color(32, 32));

    nvgBeginPath(ctx);
    nvgRoundedRect(ctx, m_pos.x() + 1, m_pos.y() + 1 + 1.0f, m_size.x() - 2, m_size.y() - 2, 3);

    nvgFillPaint(ctx, bg);

    nvgFill(ctx);

    if (mValues.size() >= 2) {
        nvgSave(ctx);

        // Additive blending
        nvgGlobalCompositeBlendFuncSeparate(
            ctx, NVGblendFactor::NVG_SRC_ALPHA, NVGblendFactor::NVG_ONE, NVGblendFactor::NVG_ZERO, NVGblendFactor::NVG_ONE
        );

        size_t nBins = mValues.size() / mNChannels;

        for (size_t i = 0; i < (size_t)mNChannels; i++) {
            nvgBeginPath(ctx);
            nvgMoveTo(ctx, m_pos.x(), m_pos.y() + m_size.y());

            for (size_t j = 0; j < (size_t)nBins; j++) {
                float value = mValues[j + i * nBins];
                float vx = m_pos.x() + 2 + j * (m_size.x() - 4) / (float)(nBins - 1);
                float vy = m_pos.y() + (1 - value) * m_size.y();
                nvgLineTo(ctx, vx, vy);
            }

            auto color = i < mColors.size() ? mColors[i] : mForegroundColor;
            nvgLineTo(ctx, m_pos.x() + m_size.x(), m_pos.y() + m_size.y());
            nvgFillColor(ctx, color);
            nvgFill(ctx);
        }

        nvgRestore(ctx);

        if (mZeroBin > 0) {
            nvgBeginPath(ctx);
            nvgRect(ctx, m_pos.x() + 1 + mZeroBin * (m_size.x() - 4) / (float)(nBins - 1), m_pos.y() + 15, 4, m_size.y() - 15);
            nvgFillColor(ctx, Color(0, 128));
            nvgFill(ctx);
            nvgBeginPath(ctx);
            nvgRect(ctx, m_pos.x() + 2 + mZeroBin * (m_size.x() - 4) / (float)(nBins - 1), m_pos.y() + 15, 2, m_size.y() - 15);
            nvgFillColor(ctx, Color(200, 255));
            nvgFill(ctx);
        }

        nvgFontFace(ctx, "sans");

        nvgFontSize(ctx, 15.0f);
        nvgTextAlign(ctx, NVG_ALIGN_LEFT | NVG_ALIGN_TOP);
        nvgFillColor(ctx, mTextColor);
        drawTextWithShadow(ctx, m_pos.x() + 3, m_pos.y() + 1, formatNumber(mMinimum));