ui/gfx/geometry/rect_f.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ui/gfx/geometry/rect_f.h"
   6
   7 #include <algorithm>
   8
   9 #if defined(OS_IOS)
  10 #include <CoreGraphics/CoreGraphics.h>
  11 #elif defined(OS_MACOSX)
  12 #include <ApplicationServices/ApplicationServices.h>
  13 #endif
  14
  15 #include "base/logging.h"
  16 #include "base/strings/stringprintf.h"
  17 #include "ui/gfx/geometry/insets_f.h"
  18 #include "ui/gfx/geometry/safe_integer_conversions.h"
  19
  20 namespace gfx {
  21
  22 static void AdjustAlongAxis(float dst_origin,
  23                             float dst_size,
  24                             float* origin,
  25                             float* size) {
  26   *size = std::min(dst_size, *size);
  27   if (*origin < dst_origin)
  28     *origin = dst_origin;
  29   else
  30     *origin = std::min(dst_origin + dst_size, *origin + *size) - *size;
  31 }
  32
  33 #if defined(OS_MACOSX)
  34 RectF::RectF(const CGRect& r)
  35     : origin_(r.origin.x, r.origin.y), size_(r.size.width, r.size.height) {
  36 }
  37
  38 CGRect RectF::ToCGRect() const {
  39   return CGRectMake(x(), y(), width(), height());
  40 }
  41 #endif
  42
  43 void RectF::Inset(const InsetsF& insets) {
  44   Inset(insets.left(), insets.top(), insets.right(), insets.bottom());
  45 }
  46
  47 void RectF::Inset(float left, float top, float right, float bottom) {
  48   origin_ += Vector2dF(left, top);
  49   set_width(std::max(width() - left - right, static_cast<float>(0)));
  50   set_height(std::max(height() - top - bottom, static_cast<float>(0)));
  51 }
  52
  53 void RectF::Offset(float horizontal, float vertical) {
  54   origin_ += Vector2dF(horizontal, vertical);
  55 }
  56
  57 void RectF::operator+=(const Vector2dF& offset) {
  58   origin_ += offset;
  59 }
  60
  61 void RectF::operator-=(const Vector2dF& offset) {
  62   origin_ -= offset;
  63 }
  64
  65 InsetsF RectF::InsetsFrom(const RectF& inner) const {
  66   return InsetsF(inner.y() - y(),
  67                  inner.x() - x(),
  68                  bottom() - inner.bottom(),
  69                  right() - inner.right());
  70 }
  71
  72 bool RectF::operator<(const RectF& other) const {
  73   if (origin_ == other.origin_) {
  74     if (width() == other.width()) {
  75       return height() < other.height();
  76     } else {
  77       return width() < other.width();
  78     }
  79   } else {
  80     return origin_ < other.origin_;
  81   }
  82 }
  83
  84 bool RectF::Contains(float point_x, float point_y) const {
  85   return (point_x >= x()) && (point_x < right()) && (point_y >= y()) &&
  86          (point_y < bottom());
  87 }
  88
  89 bool RectF::Contains(const RectF& rect) const {
  90   return (rect.x() >= x() && rect.right() <= right() && rect.y() >= y() &&
  91           rect.bottom() <= bottom());
  92 }
  93
  94 bool RectF::Intersects(const RectF& rect) const {
  95   return !(IsEmpty() || rect.IsEmpty() || rect.x() >= right() ||
  96            rect.right() <= x() || rect.y() >= bottom() || rect.bottom() <= y());
  97 }
  98
  99 void RectF::Intersect(const RectF& rect) {
 100   if (IsEmpty() || rect.IsEmpty()) {
 101     SetRect(0, 0, 0, 0);
 102     return;
 103   }
 104
 105   float rx = std::max(x(), rect.x());
 106   float ry = std::max(y(), rect.y());
 107   float rr = std::min(right(), rect.right());
 108   float rb = std::min(bottom(), rect.bottom());
 109
 110   if (rx >= rr || ry >= rb)
 111     rx = ry = rr = rb = 0;  // non-intersecting
 112
 113   SetRect(rx, ry, rr - rx, rb - ry);
 114 }
 115
 116 void RectF::Union(const RectF& rect) {
 117   if (IsEmpty()) {
 118     *this = rect;
 119     return;
 120   }
 121   if (rect.IsEmpty())
 122     return;
 123
 124   float rx = std::min(x(), rect.x());
 125   float ry = std::min(y(), rect.y());
 126   float rr = std::max(right(), rect.right());
 127   float rb = std::max(bottom(), rect.bottom());
 128
 129   SetRect(rx, ry, rr - rx, rb - ry);
 130 }
 131
 132 void RectF::Subtract(const RectF& rect) {
 133   if (!Intersects(rect))
 134     return;
 135   if (rect.Contains(*static_cast<const RectF*>(this))) {
 136     SetRect(0, 0, 0, 0);
 137     return;
 138   }
 139
 140   float rx = x();
 141   float ry = y();
 142   float rr = right();
 143   float rb = bottom();
 144
 145   if (rect.y() <= y() && rect.bottom() >= bottom()) {
 146     // complete intersection in the y-direction
 147     if (rect.x() <= x()) {
 148       rx = rect.right();
 149     } else if (rect.right() >= right()) {
 150       rr = rect.x();
 151     }
 152   } else if (rect.x() <= x() && rect.right() >= right()) {
 153     // complete intersection in the x-direction
 154     if (rect.y() <= y()) {
 155       ry = rect.bottom();
 156     } else if (rect.bottom() >= bottom()) {
 157       rb = rect.y();
 158     }
 159   }
 160   SetRect(rx, ry, rr - rx, rb - ry);
 161 }
 162
 163 void RectF::AdjustToFit(const RectF& rect) {
 164   float new_x = x();
 165   float new_y = y();
 166   float new_width = width();
 167   float new_height = height();
 168   AdjustAlongAxis(rect.x(), rect.width(), &new_x, &new_width);
 169   AdjustAlongAxis(rect.y(), rect.height(), &new_y, &new_height);
 170   SetRect(new_x, new_y, new_width, new_height);
 171 }
 172
 173 PointF RectF::CenterPoint() const {
 174   return PointF(x() + width() / 2, y() + height() / 2);
 175 }
 176
 177 void RectF::ClampToCenteredSize(const SizeF& size) {
 178   float new_width = std::min(width(), size.width());
 179   float new_height = std::min(height(), size.height());
 180   float new_x = x() + (width() - new_width) / 2;
 181   float new_y = y() + (height() - new_height) / 2;
 182   SetRect(new_x, new_y, new_width, new_height);
 183 }
 184
 185 void RectF::SplitVertically(RectF* left_half, RectF* right_half) const {
 186   DCHECK(left_half);
 187   DCHECK(right_half);
 188
 189   left_half->SetRect(x(), y(), width() / 2, height());
 190   right_half->SetRect(
 191       left_half->right(), y(), width() - left_half->width(), height());
 192 }
 193
 194 bool RectF::SharesEdgeWith(const RectF& rect) const {
 195   return (y() == rect.y() && height() == rect.height() &&
 196           (x() == rect.right() || right() == rect.x())) ||
 197          (x() == rect.x() && width() == rect.width() &&
 198           (y() == rect.bottom() || bottom() == rect.y()));
 199 }
 200
 201 float RectF::ManhattanDistanceToPoint(const PointF& point) const {
 202   float x_distance =
 203       std::max<float>(0, std::max(x() - point.x(), point.x() - right()));
 204   float y_distance =
 205       std::max<float>(0, std::max(y() - point.y(), point.y() - bottom()));
 206
 207   return x_distance + y_distance;
 208 }
 209
 210 float RectF::ManhattanInternalDistance(const RectF& rect) const {
 211   RectF c(*this);
 212   c.Union(rect);
 213
 214   static const float kEpsilon = std::numeric_limits<float>::is_integer
 215                                     ? 1
 216                                     : std::numeric_limits<float>::epsilon();
 217
 218   float x = std::max<float>(0, c.width() - width() - rect.width() + kEpsilon);
 219   float y =
 220       std::max<float>(0, c.height() - height() - rect.height() + kEpsilon);
 221   return x + y;
 222 }
 223
 224 bool RectF::IsExpressibleAsRect() const {
 225   return IsExpressibleAsInt(x()) && IsExpressibleAsInt(y()) &&
 226       IsExpressibleAsInt(width()) && IsExpressibleAsInt(height()) &&
 227       IsExpressibleAsInt(right()) && IsExpressibleAsInt(bottom());
 228 }
 229
 230 std::string RectF::ToString() const {
 231   return base::StringPrintf("%s %s",
 232                             origin().ToString().c_str(),
 233                             size().ToString().c_str());
 234 }
 235
 236 RectF IntersectRects(const RectF& a, const RectF& b) {
 237   RectF result = a;
 238   result.Intersect(b);
 239   return result;
 240 }
 241
 242 RectF UnionRects(const RectF& a, const RectF& b) {
 243   RectF result = a;
 244   result.Union(b);
 245   return result;
 246 }
 247
 248 RectF SubtractRects(const RectF& a, const RectF& b) {
 249   RectF result = a;
 250   result.Subtract(b);
 251   return result;
 252 }
 253
 254 RectF BoundingRect(const PointF& p1, const PointF& p2) {
 255   float rx = std::min(p1.x(), p2.x());
 256   float ry = std::min(p1.y(), p2.y());
 257   float rr = std::max(p1.x(), p2.x());
 258   float rb = std::max(p1.y(), p2.y());
 259   return RectF(rx, ry, rr - rx, rb - ry);
 260 }
 261
 262 }  // namespace gfx