Mercurial > projects > dwt2
annotate org.eclipse.draw2d/src/org/eclipse/draw2d/geometry/Geometry.d @ 120:536e43f63c81
Comprehensive update for Win32/Linux32 dmd-2.053/dmd-1.068+Tango-r5661
===D2===
* added [Try]Immutable/Const/Shared templates to work with differenses in D1/D2 instead of version statements
used these templates to work with strict type storage rules of dmd-2.053
* com.ibm.icu now also compilable with D2, but not tested yet
* small fixes
Snippet288 - shared data is in TLS
===Phobos===
* fixed critical bugs in Phobos implemention
completely incorrect segfault prone fromStringz (Linux's port ruthless killer)
terrible, incorrect StringBuffer realization (StyledText killer)
* fixed small bugs as well
Snippet72 - misprint in the snippet
* implemented missed functionality for Phobos
ByteArrayOutputStream implemented (image loading available)
formatting correctly works for all DWT's cases
As a result, folowing snippets now works with Phobos (Snippet### - what is fixed):
Snippet24, 42, 111, 115, 130, 235, 276 - bad string formatting
Snippet48, 282 - crash on image loading
Snippet163, 189, 211, 213, 217, 218, 222 - crash on copy/cut in StyledText
Snippet244 - hang-up
===Tango===
* few changes for the latest Tango trunc-r5661
* few small performance improvments
===General===
* implMissing-s for only one version changed to implMissingInTango/InPhobos
* incorrect calls to Format in toString-s fixed
* fixed loading \uXXXX characters in ResourceBundle
* added good UTF-8 support for StyledText, TextLayout (Win32) and friends
UTF functions revised and tested. It is now in java.nonstandard.*Utf modules
StyledText and TextLayout (Win32) modules revised for UTF-8 support
* removed small diferences in most identical files in *.swt.* folders
*.swt.internal.image, *.swt.events and *.swt.custom are identical in Win32/Linux32
now 179 of 576 (~31%) files in *.swt.* folders are fully identical
* Win32: snippets now have right subsystem, pretty icons and native system style controls
* small fixes in snippets
Snippet44 - it's not Snippet44
Snippet212 - functions work with different images and offsets arrays
Win32: Snippet282 - crash on close if the button has an image
Snippet293 - setGrayed is commented
and others
Win32: As a result, folowing snippets now works
Snippet68 - color doesn't change
Snippet163, 189, 211, 213, 217, 218, 222 - UTF-8 issues (see above)
Snippet193 - no tabel headers
author | Denis Shelomovskij <verylonglogin.reg@gmail.com> |
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date | Sat, 09 Jul 2011 15:50:20 +0300 |
parents | bc29606a740c |
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1 /******************************************************************************* |
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2 * Copyright (c) 2005, 2008 IBM Corporation and others. |
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3 * All rights reserved. This program and the accompanying materials |
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4 * are made available under the terms of the Eclipse Public License v1.0 |
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5 * which accompanies this distribution, and is available at |
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6 * http://www.eclipse.org/legal/epl-v10.html |
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7 * |
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8 * Contributors: |
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9 * IBM Corporation - initial API and implementation |
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10 * Port to the D programming language: |
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11 * Frank Benoit <benoit@tionex.de> |
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12 *******************************************************************************/ |
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13 module org.eclipse.draw2d.geometry.Geometry; |
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14 |
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15 import java.lang.all; |
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16 |
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17 /** |
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18 * A Utilities class for geometry operations. |
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19 * @author Pratik Shah |
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20 * @since 3.1 |
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21 */ |
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22 public class Geometry |
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23 { |
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24 |
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25 /** |
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26 * Determines whether the two line segments formed by the given coordinates intersect. If |
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27 * one of the two line segments starts or ends on the other line, then they are considered |
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28 * to be intersecting. |
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29 * |
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30 * @param ux x coordinate of starting point of line 1 |
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31 * @param uy y coordinate of starting point of line 1 |
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32 * @param vx x coordinate of ending point of line 1 |
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33 * @param vy y coordinate of endpoing point of line 1 |
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34 * @param sx x coordinate of the starting point of line 2 |
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35 * @param sy y coordinate of the starting point of line 2 |
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36 * @param tx x coordinate of the ending point of line 2 |
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37 * @param ty y coordinate of the ending point of line 2 |
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38 * @return <code>true</code> if the two line segments formed by the given coordinates |
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39 * cross |
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40 * @since 3.1 |
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41 */ |
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42 public static bool linesIntersect(int ux, int uy, int vx, int vy, |
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43 int sx, int sy, int tx, int ty) { |
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44 /* |
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45 * Given the segments: u-------v. s-------t. If s->t is inside the triangle u-v-s, |
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46 * then check whether the line u->u splits the line s->t. |
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47 */ |
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48 /* Values are casted to long to avoid integer overflows */ |
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49 long usX = cast(long) ux - sx; |
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50 long usY = cast(long) uy - sy; |
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51 long vsX = cast(long) vx - sx; |
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52 long vsY = cast(long) vy - sy; |
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53 long stX = cast(long) sx - tx; |
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54 long stY = cast(long) sy - ty; |
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55 if (productSign(cross(vsX, vsY, stX, stY), cross(stX, stY, usX, usY)) >= 0) { |
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56 long vuX = cast(long) vx - ux; |
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57 long vuY = cast(long) vy - uy; |
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58 long utX = cast(long) ux - tx; |
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59 long utY = cast(long) uy - ty; |
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60 return productSign(cross(-usX, -usY, vuX, vuY), cross(vuX, vuY, utX, utY)) <= 0; |
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61 } |
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62 return false; |
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63 } |
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64 |
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65 private static int productSign(long x, long y) { |
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66 if (x is 0 || y is 0) { |
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67 return 0; |
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68 } else if ((x < 0) ^ (y < 0)) { |
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69 return -1; |
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70 } |
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71 return 1; |
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72 } |
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73 |
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74 private static long cross(long x1, long y1, long x2, long y2) { |
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75 return x1 * y2 - x2 * y1; |
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76 } |
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77 |
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78 } |