gridnode.cpp Example File

scenegraph/graph/gridnode.cpp
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#include "gridnode.h" #include "qmath.h" #define GRID_SIZE 32 GridNode::GridNode() : m_geometry(QSGGeometry::defaultAttributes_Point2D(), 0) { setGeometry(&m_geometry); m_geometry.setDrawingMode(GL_LINES); setMaterial(&m_material); m_material.setColor(Qt::gray); } /* * The function hardcodes a fixed set of grid lines and scales * those to the bounding rect. */ void GridNode::setRect(const QRectF &rect) { int vCount = int((rect.width() - 1) / GRID_SIZE); int hCount = int((rect.height() - 1) / GRID_SIZE); int lineCount = vCount + hCount; QSGGeometry *g = geometry(); g->allocate(lineCount * 2); float x = rect.x(); float y = rect.y(); float w = rect.width(); float h = rect.height(); QSGGeometry::Point2D *v = g->vertexDataAsPoint2D(); // Then write the vertical lines for (int i=0; i<vCount; ++i) { float dx = (i + 1) * GRID_SIZE; v[i*2].set(dx, y); v[i*2+1].set(dx, y + h); } v += vCount * 2; // Then write the horizontal lines for (int i=0; i<hCount; ++i) { float dy = (i + 1) * GRID_SIZE; v[i*2].set(x, dy); v[i*2+1].set(x + w, dy); } // Tell the scenegraph we updated the geometry.. markDirty(QSGNode::DirtyGeometry); }