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50 | |
51 | #include "gridnode.h" |
52 | |
53 | #include "qmath.h" |
54 | |
55 | #define GRID_SIZE 32 |
56 | |
57 | GridNode::GridNode() |
58 | : m_geometry(QSGGeometry::defaultAttributes_Point2D(), 0) |
59 | { |
60 | setGeometry(&m_geometry); |
61 | m_geometry.setDrawingMode(GL_LINES); |
62 | |
63 | setMaterial(&m_material); |
64 | m_material.setColor(Qt::gray); |
65 | } |
66 | |
67 | /* |
68 | * The function hardcodes a fixed set of grid lines and scales |
69 | * those to the bounding rect. |
70 | */ |
71 | void GridNode::setRect(const QRectF &rect) |
72 | { |
73 | int vCount = int((rect.width() - 1) / GRID_SIZE); |
74 | int hCount = int((rect.height() - 1) / GRID_SIZE); |
75 | |
76 | int lineCount = vCount + hCount; |
77 | |
78 | QSGGeometry *g = geometry(); |
79 | |
80 | g->allocate(vertexCount: lineCount * 2); |
81 | |
82 | float x = rect.x(); |
83 | float y = rect.y(); |
84 | float w = rect.width(); |
85 | float h = rect.height(); |
86 | |
87 | QSGGeometry::Point2D *v = g->vertexDataAsPoint2D(); |
88 | |
89 | // Then write the vertical lines |
90 | for (int i=0; i<vCount; ++i) { |
91 | float dx = (i + 1) * GRID_SIZE; |
92 | v[i*2].set(nx: dx, ny: y); |
93 | v[i*2+1].set(nx: dx, ny: y + h); |
94 | } |
95 | v += vCount * 2; |
96 | // Then write the horizontal lines |
97 | for (int i=0; i<hCount; ++i) { |
98 | float dy = (i + 1) * GRID_SIZE; |
99 | v[i*2].set(nx: x, ny: dy); |
100 | v[i*2+1].set(nx: x + w, ny: dy); |
101 | } |
102 | |
103 | // Tell the scenegraph we updated the geometry.. |
104 | markDirty(bits: QSGNode::DirtyGeometry); |
105 | } |
106 | |