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1 /**************************************************************************** |
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2 ** |
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3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). |
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4 ** All rights reserved. |
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5 ** Contact: Nokia Corporation (qt-info@nokia.com) |
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6 ** |
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7 ** This file is part of the Qt3Support module of the Qt Toolkit. |
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8 ** |
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9 ** $QT_BEGIN_LICENSE:LGPL$ |
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10 ** No Commercial Usage |
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11 ** This file contains pre-release code and may not be distributed. |
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12 ** You may use this file in accordance with the terms and conditions |
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13 ** contained in the Technology Preview License Agreement accompanying |
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14 ** this package. |
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15 ** |
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16 ** GNU Lesser General Public License Usage |
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17 ** Alternatively, this file may be used under the terms of the GNU Lesser |
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18 ** General Public License version 2.1 as published by the Free Software |
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19 ** Foundation and appearing in the file LICENSE.LGPL included in the |
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20 ** packaging of this file. Please review the following information to |
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21 ** ensure the GNU Lesser General Public License version 2.1 requirements |
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22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. |
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23 ** |
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24 ** In addition, as a special exception, Nokia gives you certain additional |
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25 ** rights. These rights are described in the Nokia Qt LGPL Exception |
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26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. |
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27 ** |
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28 ** If you have questions regarding the use of this file, please contact |
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29 ** Nokia at qt-info@nokia.com. |
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30 ** |
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31 ** |
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32 ** |
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33 ** |
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34 ** |
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35 ** |
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36 ** |
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37 ** |
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38 ** $QT_END_LICENSE$ |
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39 ** |
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40 ****************************************************************************/ |
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41 |
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42 #include "q3pointarray.h" |
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43 #include "private/qbezier_p.h" |
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44 #include "private/qpainterpath_p.h" |
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45 |
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46 QT_BEGIN_NAMESPACE |
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47 |
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48 /*! |
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49 \class Q3PointArray |
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50 The Q3PointArray class provides an array of points. |
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51 |
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52 \compat |
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53 |
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54 Q3PointArray is a QPolygon subclass that provides functions |
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55 to make it more source compatible with the \c QPointArray class |
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56 in Qt 3. |
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57 |
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58 In Qt 4, we recommend that you use QPainterPath for representing |
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59 arcs, ellipses, and Bezier curves, rather than QPolygon. |
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60 */ |
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61 |
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62 /*! |
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63 Sets the points of the array to those describing an arc of an |
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64 ellipse with size, width \a w by height \a h, and position (\a x, |
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65 \a y), starting from angle \a a1 and spanning by angle \a a2. The |
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66 resulting array has sufficient resolution for pixel accuracy (see |
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67 the overloaded function which takes an additional QMatrix |
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68 parameter). |
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69 |
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70 Angles are specified in 16ths of a degree, i.e. a full circle |
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71 equals 5760 (16*360). Positive values mean counter-clockwise, |
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72 whereas negative values mean the clockwise direction. Zero degrees |
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73 is at the 3 o'clock position. |
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74 */ |
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75 #ifndef QT_NO_WMATRIX |
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76 void Q3PointArray::makeArc(int x, int y, int w, int h, int a1, int a2) |
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77 { |
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78 QRectF r(x, y, w, h); |
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79 QPointF startPoint; |
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80 qt_find_ellipse_coords(r, a1 / 16.0, a2 / 16.0, &startPoint, 0); |
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81 |
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82 QPainterPath path(startPoint); |
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83 path.arcTo(r, a1 / 16.0, a2 / 16.0); |
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84 |
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85 if (path.isEmpty()) |
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86 *this = Q3PointArray(); |
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87 else |
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88 *this = path.toSubpathPolygons().at(0).toPolygon(); |
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89 } |
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90 #endif |
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91 |
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92 #ifndef QT_NO_TRANSFORMATIONS |
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93 /*! |
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94 \overload |
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95 |
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96 Sets the points of the array to those describing an arc of an |
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97 ellipse with width \a w and height \a h and position (\a x, \a y), |
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98 starting from angle \a a1, and spanning angle by \a a2, and |
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99 transformed by the matrix \a xf. The resulting array has |
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100 sufficient resolution for pixel accuracy. |
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101 |
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102 Angles are specified in 16ths of a degree, i.e. a full circle |
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103 equals 5760 (16 * 360). Positive values mean counter-clockwise, |
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104 whereas negative values mean the clockwise direction. Zero |
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105 degrees is at the 3 o'clock position. |
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106 */ |
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107 void Q3PointArray::makeArc(int x, int y, int w, int h, int a1, int a2, const QMatrix &xf) |
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108 { |
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109 QRectF r(x, y, w, h); |
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110 QPointF startPoint; |
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111 qt_find_ellipse_coords(r, a1 / 16.0, a2 / 16.0, &startPoint, 0); |
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112 |
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113 QPainterPath path(startPoint); |
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114 path.arcTo(r, a1 / 16.0, a2 / 16.0); |
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115 path = path * xf; |
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116 if (path.isEmpty()) |
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117 *this = Q3PointArray(); |
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118 else |
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119 *this = path.toSubpathPolygons().at(0).toPolygon(); |
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120 } |
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121 |
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122 #endif // QT_NO_TRANSFORMATIONS |
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123 |
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124 /*! |
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125 \fn Q3PointArray::Q3PointArray() |
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126 |
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127 Constructs an empty Q3PointArray. |
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128 */ |
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129 |
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130 /*! |
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131 \fn Q3PointArray::Q3PointArray(const QRect &r, bool closed) |
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132 |
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133 Constructs a point array from the rectangle \a r. |
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134 |
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135 If \a closed is false, then the point array just contains the |
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136 following four points of the rectangle ordered clockwise. The |
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137 bottom-right point is located at (r.x() + r.width(), r.y() + |
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138 r.height()). |
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139 */ |
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140 |
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141 /*! |
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142 \fn Q3PointArray::Q3PointArray(const QPolygon& other) |
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143 |
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144 Constructs a copy of \a other. |
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145 */ |
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146 |
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147 /*! |
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148 \fn Q3PointArray Q3PointArray::copy() const |
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149 |
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150 Returns a copy of this Q3PointArray. |
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151 */ |
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152 |
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153 /*! |
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154 \fn bool Q3PointArray::isNull() |
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155 |
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156 Returns isEmpty(). Use isEmpty() instead. |
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157 */ |
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158 |
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159 /*! |
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160 Sets the points of the array to those describing an ellipse with |
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161 size, width \a w by height \a h, and position (\a x, \a y). |
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162 |
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163 The returned array has sufficient resolution for use as pixels. |
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164 */ |
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165 void Q3PointArray::makeEllipse(int x, int y, int w, int h) |
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166 { |
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167 QPainterPath path; |
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168 path.addEllipse(x, y, w, h); |
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169 *this = path.toSubpathPolygons().at(0).toPolygon(); |
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170 } |
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171 |
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172 #ifndef QT_NO_BEZIER |
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173 |
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174 /*! |
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175 Returns the Bezier points for the four control points in this |
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176 array. |
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177 */ |
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178 Q3PointArray Q3PointArray::cubicBezier() const |
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179 { |
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180 if (size() != 4) { |
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181 qWarning( "Q3PointArray::bezier: The array must have 4 control points" ); |
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182 return QPolygon(); |
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183 } |
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184 QPolygonF polygon = QBezier::fromPoints(at(0), at(1), at(2), at(3)).toPolygon(); |
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185 return polygon.toPolygon(); |
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186 } |
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187 #endif //QT_NO_BEZIER |
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188 |
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189 QT_END_NAMESPACE |