Cary Clark | a560c47 | 2017-11-27 10:44:06 -0500 | [diff] [blame] | 1 | #Topic IPoint |
| 2 | #Alias IPoints |
| 3 | #Alias IPoint_Reference |
| 4 | |
Cary Clark | 08895c4 | 2018-02-01 09:37:32 -0500 | [diff] [blame] | 5 | #Subtopic Overview |
Cary Clark | 4855f78 | 2018-02-06 09:41:53 -0500 | [diff] [blame] | 6 | #Subtopic Subtopic |
Cary Clark | 08895c4 | 2018-02-01 09:37:32 -0500 | [diff] [blame] | 7 | #Populate |
| 8 | ## |
| 9 | ## |
| 10 | |
Cary Clark | a560c47 | 2017-11-27 10:44:06 -0500 | [diff] [blame] | 11 | #Struct SkIPoint |
| 12 | |
Cary Clark | 5081eed | 2018-01-22 07:55:48 -0500 | [diff] [blame] | 13 | SkIPoint holds two 32 bit integer coordinates. |
Cary Clark | a560c47 | 2017-11-27 10:44:06 -0500 | [diff] [blame] | 14 | |
Cary Clark | 4855f78 | 2018-02-06 09:41:53 -0500 | [diff] [blame] | 15 | #Subtopic Related_Function |
Cary Clark | 08895c4 | 2018-02-01 09:37:32 -0500 | [diff] [blame] | 16 | #Populate |
| 17 | ## |
Cary Clark | a560c47 | 2017-11-27 10:44:06 -0500 | [diff] [blame] | 18 | |
Cary Clark | 4855f78 | 2018-02-06 09:41:53 -0500 | [diff] [blame] | 19 | #Subtopic Member_Function |
Cary Clark | 08895c4 | 2018-02-01 09:37:32 -0500 | [diff] [blame] | 20 | #Populate |
| 21 | ## |
Cary Clark | a560c47 | 2017-11-27 10:44:06 -0500 | [diff] [blame] | 22 | |
Cary Clark | 4855f78 | 2018-02-06 09:41:53 -0500 | [diff] [blame] | 23 | #Subtopic Member |
Cary Clark | 08895c4 | 2018-02-01 09:37:32 -0500 | [diff] [blame] | 24 | #Populate |
Cary Clark | a560c47 | 2017-11-27 10:44:06 -0500 | [diff] [blame] | 25 | |
| 26 | #Member int32_t fX |
Cary Clark | 08895c4 | 2018-02-01 09:37:32 -0500 | [diff] [blame] | 27 | #Line # x-axis value ## |
Cary Clark | a560c47 | 2017-11-27 10:44:06 -0500 | [diff] [blame] | 28 | x-axis value used by IPoint. |
| 29 | ## |
| 30 | |
| 31 | #Member int32_t fY |
Cary Clark | 08895c4 | 2018-02-01 09:37:32 -0500 | [diff] [blame] | 32 | #Line # y-axis value ## |
Cary Clark | a560c47 | 2017-11-27 10:44:06 -0500 | [diff] [blame] | 33 | y-axis value used by IPoint. |
| 34 | ## |
| 35 | |
Cary Clark | 4855f78 | 2018-02-06 09:41:53 -0500 | [diff] [blame] | 36 | #Subtopic Member ## |
Cary Clark | 08895c4 | 2018-02-01 09:37:32 -0500 | [diff] [blame] | 37 | |
Cary Clark | a560c47 | 2017-11-27 10:44:06 -0500 | [diff] [blame] | 38 | # ------------------------------------------------------------------------------ |
| 39 | |
Cary Clark | 4855f78 | 2018-02-06 09:41:53 -0500 | [diff] [blame] | 40 | #Subtopic Constructor |
| 41 | #Populate |
| 42 | ## |
| 43 | |
Cary Clark | a560c47 | 2017-11-27 10:44:06 -0500 | [diff] [blame] | 44 | #Method static constexpr SkIPoint Make(int32_t x, int32_t y) |
| 45 | |
Cary Clark | 4855f78 | 2018-02-06 09:41:53 -0500 | [diff] [blame] | 46 | #In Constructor |
Cary Clark | ab2621d | 2018-01-30 10:08:57 -0500 | [diff] [blame] | 47 | #Line # constructs from integer inputs ## |
Cary Clark | a560c47 | 2017-11-27 10:44:06 -0500 | [diff] [blame] | 48 | Sets fX to x, fY to y. |
| 49 | |
| 50 | #Param x integer x-axis value of constructed IPoint ## |
| 51 | #Param y integer y-axis value of constructed IPoint ## |
| 52 | |
| 53 | #Return IPoint (x, y) ## |
| 54 | |
| 55 | #Example |
| 56 | SkIPoint pt1 = {45, 66}; |
| 57 | SkIPoint pt2 = SkIPoint::Make(45, 66); |
| 58 | SkDebugf("pt1 %c= pt2\n", pt1 == pt2 ? '=' : '!'); |
| 59 | #StdOut |
| 60 | pt1 == pt2 |
| 61 | ## |
| 62 | ## |
| 63 | |
| 64 | #SeeAlso set() SkPoint::iset() SkPoint::Make SkIPoint16::Make |
| 65 | |
| 66 | #Method ## |
| 67 | |
| 68 | # ------------------------------------------------------------------------------ |
| 69 | |
Cary Clark | 4855f78 | 2018-02-06 09:41:53 -0500 | [diff] [blame] | 70 | #Subtopic Property |
| 71 | #Line # member values ## |
| 72 | #Populate |
| 73 | ## |
Cary Clark | a560c47 | 2017-11-27 10:44:06 -0500 | [diff] [blame] | 74 | |
Cary Clark | 4855f78 | 2018-02-06 09:41:53 -0500 | [diff] [blame] | 75 | #Method int32_t x() const |
| 76 | #In Property |
Cary Clark | ab2621d | 2018-01-30 10:08:57 -0500 | [diff] [blame] | 77 | #Line # returns fX ## |
Cary Clark | a560c47 | 2017-11-27 10:44:06 -0500 | [diff] [blame] | 78 | Returns x-axis value of IPoint. |
| 79 | |
| 80 | #Return fX ## |
| 81 | |
| 82 | #Example |
| 83 | SkIPoint pt1 = {45, 66}; |
| 84 | SkDebugf("pt1.fX %c= pt1.x()\n", pt1.fX == pt1.x() ? '=' : '!'); |
| 85 | #StdOut |
| 86 | pt1.fX == pt1.x() |
| 87 | ## |
| 88 | ## |
| 89 | |
| 90 | #SeeAlso y() SkPoint::x() SkIPoint16::x() |
| 91 | |
| 92 | #Method ## |
| 93 | |
| 94 | # ------------------------------------------------------------------------------ |
| 95 | |
| 96 | #Method int32_t y() const |
Cary Clark | 4855f78 | 2018-02-06 09:41:53 -0500 | [diff] [blame] | 97 | #In Property |
Cary Clark | ab2621d | 2018-01-30 10:08:57 -0500 | [diff] [blame] | 98 | #Line # returns fY ## |
Cary Clark | a560c47 | 2017-11-27 10:44:06 -0500 | [diff] [blame] | 99 | Returns y-axis value of IPoint. |
| 100 | |
| 101 | #Return fY ## |
| 102 | |
| 103 | #Example |
| 104 | SkIPoint pt1 = {45, 66}; |
| 105 | SkDebugf("pt1.fY %c= pt1.y()\n", pt1.fY == pt1.y() ? '=' : '!'); |
| 106 | #StdOut |
| 107 | pt1.fY == pt1.y() |
| 108 | ## |
| 109 | ## |
| 110 | |
| 111 | #SeeAlso x() SkPoint::y() SkIPoint16::y() |
| 112 | |
| 113 | #Method ## |
| 114 | |
| 115 | # ------------------------------------------------------------------------------ |
| 116 | |
| 117 | #Method bool isZero() const |
Cary Clark | 4855f78 | 2018-02-06 09:41:53 -0500 | [diff] [blame] | 118 | #In Property |
Cary Clark | ab2621d | 2018-01-30 10:08:57 -0500 | [diff] [blame] | 119 | #Line # returns true if both members equal zero ## |
Cary Clark | a560c47 | 2017-11-27 10:44:06 -0500 | [diff] [blame] | 120 | Returns true if fX and fY are both zero. |
| 121 | |
| 122 | #Return true if fX is zero and fY is zero ## |
| 123 | |
| 124 | #Example |
Cary Clark | 0c5f546 | 2017-12-15 11:21:51 -0500 | [diff] [blame] | 125 | SkIPoint pt = { 0, -0}; |
Cary Clark | a560c47 | 2017-11-27 10:44:06 -0500 | [diff] [blame] | 126 | SkDebugf("pt.isZero() == %s\n", pt.isZero() ? "true" : "false"); |
| 127 | #StdOut |
Cary Clark | 0c5f546 | 2017-12-15 11:21:51 -0500 | [diff] [blame] | 128 | pt.isZero() == true |
Cary Clark | a560c47 | 2017-11-27 10:44:06 -0500 | [diff] [blame] | 129 | ## |
| 130 | ## |
| 131 | |
| 132 | #SeeAlso SkPoint::isZero |
| 133 | |
| 134 | #Method ## |
| 135 | |
| 136 | # ------------------------------------------------------------------------------ |
| 137 | |
Cary Clark | 4855f78 | 2018-02-06 09:41:53 -0500 | [diff] [blame] | 138 | #Subtopic Set |
| 139 | #Populate |
| 140 | #Line # replaces all values ## |
| 141 | ## |
Cary Clark | a560c47 | 2017-11-27 10:44:06 -0500 | [diff] [blame] | 142 | |
Cary Clark | 4855f78 | 2018-02-06 09:41:53 -0500 | [diff] [blame] | 143 | #Method void set(int32_t x, int32_t y) |
| 144 | #In Set |
Cary Clark | ab2621d | 2018-01-30 10:08:57 -0500 | [diff] [blame] | 145 | #Line # sets to integer input ## |
Cary Clark | a560c47 | 2017-11-27 10:44:06 -0500 | [diff] [blame] | 146 | Sets fX to x and fY to y. |
| 147 | |
| 148 | #Param x new value for fX ## |
| 149 | #Param y new value for fY ## |
| 150 | |
| 151 | #Example |
| 152 | SkIPoint pt1, pt2 = { SK_MinS32, SK_MaxS32 }; |
| 153 | pt1.set(SK_MinS32, SK_MaxS32); |
| 154 | SkDebugf("pt1 %c= pt2\n", pt1 == pt2 ? '=' : '!'); |
| 155 | #StdOut |
| 156 | pt1 == pt2 |
| 157 | ## |
| 158 | ## |
| 159 | |
| 160 | #SeeAlso Make SkIPoint16::set |
| 161 | |
| 162 | #Method ## |
| 163 | |
| 164 | # ------------------------------------------------------------------------------ |
Cary Clark | 4855f78 | 2018-02-06 09:41:53 -0500 | [diff] [blame] | 165 | #Subtopic Operator |
| 166 | #Populate |
| 167 | ## |
Cary Clark | a560c47 | 2017-11-27 10:44:06 -0500 | [diff] [blame] | 168 | |
| 169 | #Method SkIPoint operator-()_const |
| 170 | |
Cary Clark | ab2621d | 2018-01-30 10:08:57 -0500 | [diff] [blame] | 171 | #Line # reverses sign of IPoint ## |
Cary Clark | a560c47 | 2017-11-27 10:44:06 -0500 | [diff] [blame] | 172 | Returns IPoint changing the signs of fX and fY. |
| 173 | |
| 174 | #Return IPoint as (-fX, -fY) ## |
| 175 | |
| 176 | #Example |
Cary Clark | 0c5f546 | 2017-12-15 11:21:51 -0500 | [diff] [blame] | 177 | SkIPoint test[] = { {0, -0}, {-1, -2}, |
| 178 | { SK_MaxS32, SK_MinS32 }, |
Cary Clark | 681287e | 2018-03-16 11:34:15 -0400 | [diff] [blame^] | 179 | { SK_NaN32, SK_NaN32 } }; |
Cary Clark | 0c5f546 | 2017-12-15 11:21:51 -0500 | [diff] [blame] | 180 | for (const SkIPoint& pt : test) { |
| 181 | SkIPoint negPt = -pt; |
| 182 | SkDebugf("pt: %d, %d negate: %d, %d\n", pt.fX, pt.fY, negPt.fX, negPt.fY); |
Cary Clark | a560c47 | 2017-11-27 10:44:06 -0500 | [diff] [blame] | 183 | } |
| 184 | #StdOut |
Cary Clark | 0c5f546 | 2017-12-15 11:21:51 -0500 | [diff] [blame] | 185 | pt: 0, 0 negate: 0, 0 |
| 186 | pt: -1, -2 negate: 1, 2 |
| 187 | pt: 2147483647, -2147483647 negate: -2147483647, 2147483647 |
Cary Clark | a560c47 | 2017-11-27 10:44:06 -0500 | [diff] [blame] | 188 | pt: -2147483648, -2147483648 negate: -2147483648, -2147483648 |
| 189 | ## |
| 190 | ## |
| 191 | |
| 192 | #SeeAlso operator-(const SkIPoint& a, const SkIPoint& b) operator-=(const SkIVector& v) SkPoint::operator-()_const |
| 193 | |
| 194 | #Method ## |
| 195 | |
| 196 | # ------------------------------------------------------------------------------ |
| 197 | |
| 198 | #Method void operator+=(const SkIVector& v) |
| 199 | |
Cary Clark | ab2621d | 2018-01-30 10:08:57 -0500 | [diff] [blame] | 200 | #Line # adds IVector to IPoint ## |
Cary Clark | a560c47 | 2017-11-27 10:44:06 -0500 | [diff] [blame] | 201 | Offsets IPoint by IVector v. Sets IPoint to |
| 202 | #Formula |
| 203 | (fX + v.fX, fY + v.fY) |
| 204 | ## |
| 205 | . |
| 206 | |
| 207 | #Param v IVector to add ## |
| 208 | |
| 209 | #Example |
| 210 | #Height 64 |
Cary Clark | 0c5f546 | 2017-12-15 11:21:51 -0500 | [diff] [blame] | 211 | auto draw_lines = [=](const SkIPoint pts[], size_t count, SkPaint& paint) -> void { |
| 212 | for (size_t i = 0; i < count - 1; ++i) { |
| 213 | SkPoint p0, p1; |
| 214 | p0.iset(pts[i]); |
| 215 | p1.iset(pts[i + 1]); |
| 216 | canvas->drawLine(p0, p1, paint); |
| 217 | } |
| 218 | }; |
| 219 | SkIPoint points[] = { { 3, 1 }, { 4, 2 }, { 5, 1 }, { 7, 3 } }; |
| 220 | SkPaint paint; |
| 221 | paint.setAntiAlias(true); |
| 222 | paint.setStyle(SkPaint::kStroke_Style); |
| 223 | canvas->scale(30, 15); |
| 224 | draw_lines(points, SK_ARRAY_COUNT(points), paint); |
| 225 | points[1] += {1, 1}; |
| 226 | points[2] += {-1, -1}; |
| 227 | paint.setColor(SK_ColorRED); |
| 228 | draw_lines(points, SK_ARRAY_COUNT(points), paint); |
Cary Clark | a560c47 | 2017-11-27 10:44:06 -0500 | [diff] [blame] | 229 | ## |
| 230 | |
| 231 | #SeeAlso operator+(const SkIPoint& a, const SkIVector& b) SkPoint::operator+=(const SkVector& v) |
| 232 | |
| 233 | #Method ## |
| 234 | |
| 235 | # ------------------------------------------------------------------------------ |
| 236 | |
| 237 | #Method void operator-=(const SkIVector& v) |
| 238 | |
Cary Clark | ab2621d | 2018-01-30 10:08:57 -0500 | [diff] [blame] | 239 | #Line # subtracts IVector from IPoint ## |
Cary Clark | a560c47 | 2017-11-27 10:44:06 -0500 | [diff] [blame] | 240 | Subtracts IVector v from IPoint. Sets IPoint to: |
| 241 | #Formula |
| 242 | (fX - v.fX, fY - v.fY) |
| 243 | ## |
| 244 | . |
| 245 | |
| 246 | #Param v IVector to subtract ## |
| 247 | |
| 248 | #Example |
| 249 | #Height 64 |
Cary Clark | 0c5f546 | 2017-12-15 11:21:51 -0500 | [diff] [blame] | 250 | auto draw_lines = [=](const SkIPoint pts[], size_t count, SkPaint& paint) -> void { |
| 251 | for (size_t i = 0; i < count - 1; ++i) { |
| 252 | SkPoint p0, p1; |
| 253 | p0.iset(pts[i]); |
| 254 | p1.iset(pts[i + 1]); |
| 255 | canvas->drawLine(p0, p1, paint); |
| 256 | } |
| 257 | }; |
| 258 | SkIPoint points[] = { { 3, 1 }, { 4, 2 }, { 5, 1 }, { 7, 3 } }; |
| 259 | SkPaint paint; |
| 260 | paint.setAntiAlias(true); |
| 261 | paint.setStyle(SkPaint::kStroke_Style); |
| 262 | canvas->scale(30, 15); |
| 263 | draw_lines(points, SK_ARRAY_COUNT(points), paint); |
| 264 | points[1] -= {1, 1}; |
| 265 | points[2] -= {-1, -1}; |
| 266 | paint.setColor(SK_ColorRED); |
| 267 | draw_lines(points, SK_ARRAY_COUNT(points), paint); |
Cary Clark | a560c47 | 2017-11-27 10:44:06 -0500 | [diff] [blame] | 268 | ## |
| 269 | |
| 270 | #SeeAlso operator-(const SkIPoint& a, const SkIPoint& b) SkPoint::operator-=(const SkVector& v) |
| 271 | |
| 272 | #Method ## |
| 273 | |
| 274 | # ------------------------------------------------------------------------------ |
| 275 | |
| 276 | #Method bool equals(int32_t x, int32_t y) const |
Cary Clark | 4855f78 | 2018-02-06 09:41:53 -0500 | [diff] [blame] | 277 | #In Operator |
Cary Clark | ab2621d | 2018-01-30 10:08:57 -0500 | [diff] [blame] | 278 | #Line # returns true if members are equal ## |
Cary Clark | a560c47 | 2017-11-27 10:44:06 -0500 | [diff] [blame] | 279 | Returns true if IPoint is equivalent to IPoint constructed from (x, y). |
| 280 | |
| 281 | #Param x value compared with fX ## |
| 282 | #Param y value compared with fY ## |
| 283 | |
| 284 | #Return true if IPoint equals (x, y) ## |
| 285 | |
| 286 | #Example |
Cary Clark | 0c5f546 | 2017-12-15 11:21:51 -0500 | [diff] [blame] | 287 | SkIPoint test[] = { {0, -0}, {-1, -2}, {SK_MaxS32, -1}, {SK_NaN32, -1} }; |
| 288 | for (const SkIPoint& pt : test) { |
| 289 | SkDebugf("pt: %d, %d %c= pt\n", pt.fX, pt.fY, pt.equals(pt.fX, pt.fY) ? '=' : '!'); |
Cary Clark | a560c47 | 2017-11-27 10:44:06 -0500 | [diff] [blame] | 290 | } |
| 291 | #StdOut |
Cary Clark | 0c5f546 | 2017-12-15 11:21:51 -0500 | [diff] [blame] | 292 | pt: 0, 0 == pt |
| 293 | pt: -1, -2 == pt |
| 294 | pt: 2147483647, -1 == pt |
Cary Clark | a560c47 | 2017-11-27 10:44:06 -0500 | [diff] [blame] | 295 | pt: -2147483648, -1 == pt |
| 296 | ## |
| 297 | ## |
| 298 | |
| 299 | #SeeAlso operator==(const SkIPoint& a, const SkIPoint& b) |
| 300 | |
| 301 | #Method ## |
| 302 | |
| 303 | # ------------------------------------------------------------------------------ |
| 304 | |
| 305 | #Method bool operator==(const SkIPoint& a, const SkIPoint& b) |
| 306 | |
Cary Clark | ab2621d | 2018-01-30 10:08:57 -0500 | [diff] [blame] | 307 | #Line # returns true if IPoints are equal ## |
Cary Clark | a560c47 | 2017-11-27 10:44:06 -0500 | [diff] [blame] | 308 | Returns true if a is equivalent to b. |
| 309 | |
| 310 | #Param a IPoint to compare ## |
| 311 | #Param b IPoint to compare ## |
| 312 | |
| 313 | #Return true if a.fX == b.fX and a.fY == b.fY ## |
| 314 | |
| 315 | #Example |
Cary Clark | 0c5f546 | 2017-12-15 11:21:51 -0500 | [diff] [blame] | 316 | SkIPoint test[] = { {0, -0}, {-1, -2}, {SK_MaxS32, -1}, {SK_NaN32, -1} }; |
| 317 | for (const SkIPoint& pt : test) { |
| 318 | SkDebugf("pt: %d, %d %c= pt\n", pt.fX, pt.fY, pt == pt ? '=' : '!'); |
Cary Clark | a560c47 | 2017-11-27 10:44:06 -0500 | [diff] [blame] | 319 | } |
| 320 | #StdOut |
Cary Clark | 0c5f546 | 2017-12-15 11:21:51 -0500 | [diff] [blame] | 321 | pt: 0, 0 == pt |
| 322 | pt: -1, -2 == pt |
| 323 | pt: 2147483647, -1 == pt |
Cary Clark | a560c47 | 2017-11-27 10:44:06 -0500 | [diff] [blame] | 324 | pt: -2147483648, -1 == pt |
| 325 | ## |
| 326 | ## |
| 327 | |
| 328 | #SeeAlso equals() operator!=(const SkIPoint& a, const SkIPoint& b) |
| 329 | |
| 330 | #Method ## |
| 331 | |
| 332 | # ------------------------------------------------------------------------------ |
| 333 | |
| 334 | #Method bool operator!=(const SkIPoint& a, const SkIPoint& b) |
| 335 | |
Cary Clark | ab2621d | 2018-01-30 10:08:57 -0500 | [diff] [blame] | 336 | #Line # returns true if IPoints are unequal ## |
Cary Clark | a560c47 | 2017-11-27 10:44:06 -0500 | [diff] [blame] | 337 | Returns true if a is not equivalent to b. |
| 338 | |
| 339 | #Param a IPoint to compare ## |
| 340 | #Param b IPoint to compare ## |
| 341 | |
| 342 | #Return true if a.fX != b.fX or a.fY != b.fY ## |
| 343 | |
| 344 | #Example |
Cary Clark | 0c5f546 | 2017-12-15 11:21:51 -0500 | [diff] [blame] | 345 | SkIPoint test[] = { {0, -0}, {-1, -2}, {SK_MaxS32, -1}, {SK_NaN32, -1} }; |
| 346 | for (const SkIPoint& pt : test) { |
| 347 | SkDebugf("pt: %d, %d %c= pt\n", pt.fX, pt.fY, pt != pt ? '!' : '='); |
Cary Clark | a560c47 | 2017-11-27 10:44:06 -0500 | [diff] [blame] | 348 | } |
| 349 | #StdOut |
Cary Clark | 0c5f546 | 2017-12-15 11:21:51 -0500 | [diff] [blame] | 350 | pt: 0, 0 == pt |
| 351 | pt: -1, -2 == pt |
| 352 | pt: 2147483647, -1 == pt |
Cary Clark | a560c47 | 2017-11-27 10:44:06 -0500 | [diff] [blame] | 353 | pt: -2147483648, -1 == pt |
| 354 | ## |
| 355 | ## |
| 356 | |
| 357 | #SeeAlso operator==(const SkIPoint& a, const SkIPoint& b) equals() |
| 358 | |
| 359 | #Method ## |
| 360 | |
| 361 | # ------------------------------------------------------------------------------ |
| 362 | |
| 363 | #Method SkIVector operator-(const SkIPoint& a, const SkIPoint& b) |
| 364 | |
Cary Clark | ab2621d | 2018-01-30 10:08:57 -0500 | [diff] [blame] | 365 | #Line # returns IVector between IPoints ## |
Cary Clark | a560c47 | 2017-11-27 10:44:06 -0500 | [diff] [blame] | 366 | Returns IVector from b to a; computed as |
| 367 | #Formula |
| 368 | (a.fX - b.fX, a.fY - b.fY) |
| 369 | ## |
| 370 | . |
| 371 | |
| 372 | Can also be used to subtract IVector from IVector, returning IVector. |
| 373 | |
| 374 | #Param a IPoint or IVector to subtract from ## |
| 375 | #Param b IVector to subtract ## |
| 376 | |
| 377 | #Return IVector from b to a ## |
| 378 | |
| 379 | #Example |
| 380 | #Height 64 |
Cary Clark | 0c5f546 | 2017-12-15 11:21:51 -0500 | [diff] [blame] | 381 | auto draw_lines = [=](const SkIPoint pts[], size_t count, SkPaint& paint) -> void { |
| 382 | for (size_t i = 0; i < count - 1; ++i) { |
| 383 | SkPoint p0, p1; |
| 384 | p0.iset(pts[i]); |
| 385 | p1.iset(pts[i + 1]); |
| 386 | canvas->drawLine(p0, p1, paint); |
| 387 | } |
| 388 | }; |
| 389 | SkIPoint points[] = { { 3, 1 }, { 4, 2 }, { 5, 1 }, { 7, 3 } }; |
| 390 | SkPaint paint; |
| 391 | paint.setAntiAlias(true); |
| 392 | paint.setStyle(SkPaint::kStroke_Style); |
| 393 | canvas->scale(30, 15); |
| 394 | draw_lines(points, SK_ARRAY_COUNT(points), paint); |
| 395 | points[1] += points[0] - points[3]; |
| 396 | points[2] -= points[1] - points[0]; |
| 397 | paint.setColor(SK_ColorRED); |
| 398 | draw_lines(points, SK_ARRAY_COUNT(points), paint); |
Cary Clark | a560c47 | 2017-11-27 10:44:06 -0500 | [diff] [blame] | 399 | ## |
| 400 | |
| 401 | #SeeAlso operator-=(const SkIVector& v) |
| 402 | |
| 403 | #Method ## |
| 404 | |
| 405 | # ------------------------------------------------------------------------------ |
| 406 | |
| 407 | #Method SkIPoint operator+(const SkIPoint& a, const SkIVector& b) |
| 408 | |
Cary Clark | ab2621d | 2018-01-30 10:08:57 -0500 | [diff] [blame] | 409 | #Line # returns IPoint offset by IVector ## |
Cary Clark | a560c47 | 2017-11-27 10:44:06 -0500 | [diff] [blame] | 410 | Returns IPoint resulting from IPoint a offset by IVector b, computed as: |
| 411 | #Formula |
| 412 | (a.fX + b.fX, a.fY + b.fY) |
| 413 | ## |
| 414 | . |
| 415 | |
| 416 | Can also be used to offset IPoint b by IVector a, returning IPoint. |
| 417 | Can also be used to add IVector to IVector, returning IVector. |
| 418 | |
| 419 | #Param a IPoint or IVector to add to ## |
| 420 | #Param b IPoint or IVector to add ## |
| 421 | |
| 422 | #Return IPoint equal to a offset by b ## |
| 423 | |
| 424 | #Example |
| 425 | #Height 128 |
Cary Clark | 0c5f546 | 2017-12-15 11:21:51 -0500 | [diff] [blame] | 426 | auto draw_lines = [=](const SkIPoint pts[], size_t count, SkPaint& paint) -> void { |
| 427 | for (size_t i = 0; i < count - 1; ++i) { |
| 428 | SkPoint p0, p1; |
| 429 | p0.iset(pts[i]); |
| 430 | p1.iset(pts[i + 1]); |
| 431 | canvas->drawLine(p0, p1, paint); |
| 432 | } |
| 433 | }; |
| 434 | SkIPoint points[] = { { 3, 1 }, { 4, 2 }, { 5, 1 }, { 7, 3 } }; |
| 435 | SkPaint paint; |
| 436 | paint.setAntiAlias(true); |
| 437 | paint.setStyle(SkPaint::kStroke_Style); |
| 438 | canvas->scale(30, 15); |
| 439 | draw_lines(points, SK_ARRAY_COUNT(points), paint); |
| 440 | SkIPoint mod = {4, 1}; |
| 441 | for (auto& point : points) { |
| 442 | point = point + mod; |
| 443 | mod.fX -= 1; |
| 444 | mod.fY += 1; |
| 445 | } |
| 446 | paint.setColor(SK_ColorRED); |
| 447 | draw_lines(points, SK_ARRAY_COUNT(points), paint); |
Cary Clark | a560c47 | 2017-11-27 10:44:06 -0500 | [diff] [blame] | 448 | ## |
| 449 | |
| 450 | #SeeAlso operator+=(const SkIVector& v) |
| 451 | |
| 452 | #Method ## |
| 453 | |
| 454 | #Struct SkIPoint ## |
| 455 | |
| 456 | #Topic IPoint ## |
| 457 | |
| 458 | #Topic IVector |
| 459 | #Alias IVectors |
| 460 | #Typedef SkIPoint SkIVector |
| 461 | #Typedef ## |
| 462 | ## |