Class QAccelPlot::LineCurveLineRenderer

ClassList > QAccelPlot > LineCurveLineRenderer

Internal renderer responsible for building and updating QSGNode line geometry for a LineCurve .More...

• #include <LineCurveLineRenderer.hpp>

Public Functions

Type	Name
bool	contains (const QPointF & point, const CurveHitTestParams & params) const Returns true if__point lies within__params.hitThreshold pixels of the curve.
QSGNode *	paint (QSGNode * oldNode, const LineCurveRenderParams & params) const Updates the scene graph node tree for this curve.

Public Static Functions

Type	Name
std::shared_ptr< DataTexture >	dataTexture (QSGNode * node) Returns the data texture of the line in node , a tree returned bypaint() , ornullptr before an upload.
std::size_t	vertexCacheBytesPerPoint (StepMode stepMode) Returns the vertex cache bytes per data point of a line drawn with stepMode .
void	writeVertexCache (std::vector< char > & cache, int firstPoint, int pointCount, StepMode stepMode) Writes the vertices of data points [ firstPoint _,_pointCount ) of a line drawn with__stepMode into__cache .

Detailed Description

Supports solid and dashed lines, gradient stroke, gradient fill, and optional pre-built vertex caches assembled on the main thread for reduced render-thread stalls.

Public Functions Documentation

function contains

Returns true if__point lies within__params.hitThreshold pixels of the curve.

bool QAccelPlot::LineCurveLineRenderer::contains (
    const QPointF & point,
    const CurveHitTestParams & params
) const

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function paint

Updates the scene graph node tree for this curve.

QSGNode * QAccelPlot::LineCurveLineRenderer::paint (
    QSGNode * oldNode,
    const LineCurveRenderParams & params
) const

When params.vertexCache is non-null the vertex data is transferred via a fast memcpy; otherwise geometry is built in-place on the render thread.

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Public Static Functions Documentation

function dataTexture

Returns the data texture of the line in node , a tree returned bypaint() , ornullptr before an upload.

static std::shared_ptr< DataTexture > QAccelPlot::LineCurveLineRenderer::dataTexture (
    QSGNode * node
) 

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function vertexCacheBytesPerPoint

Returns the vertex cache bytes per data point of a line drawn with stepMode .

static std::size_t QAccelPlot::LineCurveLineRenderer::vertexCacheBytesPerPoint (
    StepMode stepMode
) 

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function writeVertexCache

Writes the vertices of data points [ firstPoint _,_pointCount ) of a line drawn with__stepMode into__cache .

static void QAccelPlot::LineCurveLineRenderer::writeVertexCache (
    std::vector< char > & cache,
    int firstPoint,
    int pointCount,
    StepMode stepMode
) 

cache holds vertexCacheBytesPerPoint() bytes for each of pointCount data points. A vertex depends only on its data point index and step corner, never on data values, so the vertices before firstPoint stay valid. Writes neutral RGBA (1,1,1,1); solid and gradient shaders obtain their colors from their materials.

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The documentation for this class was generated from the following file QAccelPlot/src/QAccelPlot/renderers/LineCurveLineRenderer.hpp