ktechlab/src/utils.h

0001
0002 #ifndef UTILS_H
0003 #define UTILS_H
0004
0005 #include <QPoint>
0006 #include <cmath>
0007
0008 inline int roundDown(int x, int roundness)
0009 {
0010     if (x < 0)
0011         return (x - roundness + 1) / roundness;
0012     else
0013         return (x / roundness);
0014 }
0015 inline int roundDown(double x, int roundness)
0016 {
0017     return roundDown(int(x), roundness);
0018 }
0019
0020 inline QPoint roundDown(const QPoint &p, int roundness)
0021 {
0022     return QPoint(roundDown(p.x(), roundness), roundDown(p.y(), roundness));
0023 }
0024
0025 inline int toCanvas(int pos)
0026 {
0027     return pos * 8 + 4;
0028 }
0029 inline int fromCanvas(int pos)
0030 {
0031     return roundDown(pos - 4, 8);
0032 }
0033
0034 inline QPoint toCanvas(const QPoint *pos)
0035 {
0036     return QPoint(toCanvas(pos->x()), toCanvas(pos->y()));
0037 }
0038 inline QPoint fromCanvas(const QPoint *pos)
0039 {
0040     return QPoint(fromCanvas(pos->x()), fromCanvas(pos->y()));
0041 }
0042
0043 inline QPoint toCanvas(const QPoint &pos)
0044 {
0045     return QPoint(toCanvas(pos.x()), toCanvas(pos.y()));
0046 }
0047 inline QPoint fromCanvas(const QPoint &pos)
0048 {
0049     return QPoint(fromCanvas(pos.x()), fromCanvas(pos.y()));
0050 }
0051
0052 inline int roundDouble(double x)
0053 {
0054     return int(std::floor(x + 0.5));
0055 }
0056
0057 inline double qpoint_distance(const QPoint &p1, const QPoint &p2)
0058 {
0059     double dx = p1.x() - p2.x();
0060     double dy = p1.y() - p2.y();
0061
0062     return std::sqrt(dx * dx + dy * dy);
0063 }
0064
0065 inline int snapToCanvas(int x)
0066 {
0067     return roundDown(x, 8) * 8 + 4;
0068 }
0069 inline int snapToCanvas(double x)
0070 {
0071     return snapToCanvas(int(x));
0072 }
0073
0074 #endif