Method updateColor

core/2d/Layer.cpp:217–271

}

void LayerGradient::updateColor()
{
    float h = _alongVector.getLength();
    if (h == 0)
        return;

    float c = sqrtf(2.0f);
    Vec2 u(_alongVector.x / h, _alongVector.y / h);

    // Compressed Interpolation mode
    if (_compressedInterpolation)
    {
        float h2 = 1 / (fabsf(u.x) + fabsf(u.y));
        u        = u * (h2 * (float)c);
    }

    float opacityf = (float)_displayedOpacity / 255.0f;

    Color4F S(_displayedColor.r / 255.0f, _displayedColor.g / 255.0f, _displayedColor.b / 255.0f,
              _startOpacity * opacityf / 255.0f);

    Color4F E(_endColor.r / 255.0f, _endColor.g / 255.0f, _endColor.b / 255.0f, _endOpacity * opacityf / 255.0f);

    // (-1, -1)
    _quad.bl.colors.r = (E.r + (S.r - E.r) * ((c + u.x + u.y) / (2.0f * c))) * 255;
    _quad.bl.colors.g = (E.g + (S.g - E.g) * ((c + u.x + u.y) / (2.0f * c))) * 255;
    _quad.bl.colors.b = (E.b + (S.b - E.b) * ((c + u.x + u.y) / (2.0f * c))) * 255;
    _quad.bl.colors.a = (E.a + (S.a - E.a) * ((c + u.x + u.y) / (2.0f * c))) * 255;
    // (1, -1)
    _quad.br.colors.r = (E.r + (S.r - E.r) * ((c - u.x + u.y) / (2.0f * c))) * 255;
    _quad.br.colors.g = (E.g + (S.g - E.g) * ((c - u.x + u.y) / (2.0f * c))) * 255;
    _quad.br.colors.b = (E.b + (S.b - E.b) * ((c - u.x + u.y) / (2.0f * c))) * 255;
    _quad.br.colors.a = (E.a + (S.a - E.a) * ((c - u.x + u.y) / (2.0f * c))) * 255;
    // (-1, 1)
    _quad.tl.colors.r = (E.r + (S.r - E.r) * ((c + u.x - u.y) / (2.0f * c))) * 255;
    _quad.tl.colors.g = (E.g + (S.g - E.g) * ((c + u.x - u.y) / (2.0f * c))) * 255;
    _quad.tl.colors.b = (E.b + (S.b - E.b) * ((c + u.x - u.y) / (2.0f * c))) * 255;
    _quad.tl.colors.a = (E.a + (S.a - E.a) * ((c + u.x - u.y) / (2.0f * c))) * 255;
    // (1, 1)
    _quad.tr.colors.r = (E.r + (S.r - E.r) * ((c - u.x - u.y) / (2.0f * c))) * 255;
    _quad.tr.colors.g = (E.g + (S.g - E.g) * ((c - u.x - u.y) / (2.0f * c))) * 255;
    _quad.tr.colors.b = (E.b + (S.b - E.b) * ((c - u.x - u.y) / (2.0f * c))) * 255;
    _quad.tr.colors.a = (E.a + (S.a - E.a) * ((c - u.x - u.y) / (2.0f * c))) * 255;

    // renders using batch node
    if (_renderMode == RenderMode::QUAD_BATCHNODE)
    {
        if (_atlasIndex != INDEX_NOT_INITIALIZED)
            _textureAtlas->updateQuad(_quad, _atlasIndex);
        else
            // no need to set it recursively
            // update dirty_, don't update recursiveDirty_
            setDirty(true);
    }
}

const Color3B& LayerGradient::getStartColor() const
{