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00010 #include <math.h>
00011 #include <qpainter.h>
00012 #include "qwt_math.h"
00013 #include "qwt_painter.h"
00014 #include "qwt_compass_rose.h"
00015
00016 static QPoint cutPoint(QPoint p11, QPoint p12, QPoint p21, QPoint p22)
00017 {
00018 double dx1 = p12.x() - p11.x();
00019 double dy1 = p12.y() - p11.y();
00020 double dx2 = p22.x() - p21.x();
00021 double dy2 = p22.y() - p21.y();
00022
00023 if ( dx1 == 0.0 && dx2 == 0.0 )
00024 return QPoint();
00025
00026 if ( dx1 == 0.0 )
00027 {
00028 const double m = dy2 / dx2;
00029 const double t = p21.y() - m * p21.x();
00030 return QPoint(p11.x(), qwtInt(m * p11.x() + t));
00031 }
00032
00033 if ( dx2 == 0 )
00034 {
00035 const double m = dy1 / dx1;
00036 const double t = p11.y() - m * p11.x();
00037 return QPoint(p21.x(), qwtInt(m * p21.x() + t));
00038 }
00039
00040 const double m1 = dy1 / dx1;
00041 const double t1 = p11.y() - m1 * p11.x();
00042
00043 const double m2 = dy2 / dx2;
00044 const double t2 = p21.y() - m2 * p21.x();
00045
00046 if ( m1 == m2 )
00047 return QPoint();
00048
00049 const double x = ( t2 - t1 ) / ( m1 - m2 );
00050 const double y = t1 + m1 * x;
00051
00052 return QPoint(qwtInt(x), qwtInt(y));
00053 }
00054
00055 QwtSimpleCompassRose::QwtSimpleCompassRose(int numThorns, int numThornLevels):
00056 d_width(0.2),
00057 d_numThorns(numThorns),
00058 d_numThornLevels(numThornLevels),
00059 d_shrinkFactor(0.9)
00060 {
00061 const QColor dark(128,128,255);
00062 const QColor light(192,255,255);
00063
00064 QPalette palette;
00065 for ( int i = 0; i < QPalette::NColorGroups; i++ )
00066 {
00067 palette.setColor((QPalette::ColorGroup)i,
00068 QColorGroup::Dark, dark);
00069 palette.setColor((QPalette::ColorGroup)i,
00070 QColorGroup::Light, light);
00071 }
00072
00073 setPalette(palette);
00074 }
00075
00076 void QwtSimpleCompassRose::draw(QPainter *painter, const QPoint ¢er,
00077 int radius, double north, QPalette::ColorGroup cg) const
00078 {
00079 QColorGroup colorGroup;
00080 switch(cg)
00081 {
00082 case QPalette::Disabled:
00083 colorGroup = palette().disabled();
00084 case QPalette::Inactive:
00085 colorGroup = palette().inactive();
00086 default:
00087 colorGroup = palette().active();
00088 }
00089
00090 drawRose(painter, colorGroup, center, radius, north, d_width,
00091 d_numThorns, d_numThornLevels, d_shrinkFactor);
00092 }
00093
00094 void QwtSimpleCompassRose::drawRose(
00095 QPainter *painter, const QColorGroup &cg,
00096 const QPoint ¢er, int radius, double north, double width,
00097 int numThorns, int numThornLevels, double shrinkFactor)
00098 {
00099 if ( numThorns < 4 )
00100 numThorns = 4;
00101
00102 if ( numThorns % 4 )
00103 numThorns += 4 - numThorns % 4;
00104
00105 if ( numThornLevels <= 0 )
00106 numThornLevels = numThorns / 4;
00107
00108 if ( shrinkFactor >= 1.0 )
00109 shrinkFactor = 1.0;
00110
00111 if ( shrinkFactor <= 0.5 )
00112 shrinkFactor = 0.5;
00113
00114 painter->save();
00115
00116 painter->setPen(Qt::NoPen);
00117
00118 for ( int j = 1; j <= numThornLevels; j++ )
00119 {
00120 double step = pow(2.0, j) * M_PI / (double)numThorns;
00121 if ( step > M_PI_2 )
00122 break;
00123
00124 double r = radius;
00125 for ( int k = 0; k < 3; k++ )
00126 {
00127 if ( j + k < numThornLevels )
00128 r *= shrinkFactor;
00129 }
00130
00131 double leafWidth = r * width;
00132 if ( 2.0 * M_PI / step > 32 )
00133 leafWidth = 16;
00134
00135 const double origin = north / 180.0 * M_PI;
00136 for ( double angle = origin;
00137 angle < 2.0 * M_PI + origin; angle += step)
00138 {
00139 const QPoint p = qwtPolar2Pos(center, r, angle);
00140 QPoint p1 = qwtPolar2Pos(center, leafWidth, angle + M_PI_2);
00141 QPoint p2 = qwtPolar2Pos(center, leafWidth, angle - M_PI_2);
00142
00143 QPointArray pa(3);
00144 pa.setPoint(0, center);
00145 pa.setPoint(1, p);
00146
00147 QPoint p3 = qwtPolar2Pos(center, r, angle + step / 2.0);
00148 p1 = cutPoint(center, p3, p1, p);
00149 pa.setPoint(2, p1);
00150 painter->setBrush(cg.brush(QColorGroup::Dark));
00151 painter->drawPolygon(pa);
00152
00153 QPoint p4 = qwtPolar2Pos(center, r, angle - step / 2.0);
00154 p2 = cutPoint(center, p4, p2, p);
00155
00156 pa.setPoint(2, p2);
00157 painter->setBrush(cg.brush(QColorGroup::Light));
00158 painter->drawPolygon(pa);
00159 }
00160 }
00161 painter->restore();
00162 }
00163
00169 void QwtSimpleCompassRose::setWidth(double w)
00170 {
00171 d_width = w;
00172 if (d_width < 0.03)
00173 d_width = 0.03;
00174
00175 if (d_width > 0.4)
00176 d_width = 0.4;
00177 }
00178
00179 void QwtSimpleCompassRose::setNumThorns(int numThorns)
00180 {
00181 if ( numThorns < 4 )
00182 numThorns = 4;
00183
00184 if ( numThorns % 4 )
00185 numThorns += 4 - numThorns % 4;
00186
00187 d_numThorns = numThorns;
00188 }
00189
00190 int QwtSimpleCompassRose::numThorns() const
00191 {
00192 return d_numThorns;
00193 }
00194
00195 void QwtSimpleCompassRose::setNumThornLevels(int numThornLevels)
00196 {
00197 d_numThornLevels = numThornLevels;
00198 }
00199
00200 int QwtSimpleCompassRose::numThornLevels() const
00201 {
00202 return d_numThornLevels;
00203 }