wxPython/wx/lib/ogl/_oglmisc.py

   1 # -*- coding: iso-8859-1 -*-
   2 #----------------------------------------------------------------------------
   3 # Name:         oglmisc.py
   4 # Purpose:      Miscellaneous OGL support functions
   5 #
   6 # Author:       Pierre Hjälm (from C++ original by Julian Smart)
   7 #
   8 # Created:      2004-05-08
   9 # RCS-ID:       $Id$
  10 # Copyright:    (c) 2004 Pierre Hjälm - 1998 Julian Smart
  11 # Licence:      wxWindows license
  12 #----------------------------------------------------------------------------
  13
  14 import math
  15
  16 import wx
  17
  18 # Control point types
  19 # Rectangle and most other shapes
  20 CONTROL_POINT_VERTICAL = 1
  21 CONTROL_POINT_HORIZONTAL = 2
  22 CONTROL_POINT_DIAGONAL = 3
  23
  24 # Line
  25 CONTROL_POINT_ENDPOINT_TO = 4
  26 CONTROL_POINT_ENDPOINT_FROM = 5
  27 CONTROL_POINT_LINE = 6
  28
  29 # Types of formatting: can be combined in a bit list
  30 FORMAT_NONE = 0             # Left justification
  31 FORMAT_CENTRE_HORIZ = 1     # Centre horizontally
  32 FORMAT_CENTRE_VERT = 2      # Centre vertically
  33 FORMAT_SIZE_TO_CONTENTS = 4 # Resize shape to contents
  34
  35 # Attachment modes
  36 ATTACHMENT_MODE_NONE, ATTACHMENT_MODE_EDGE, ATTACHMENT_MODE_BRANCHING = 0, 1, 2
  37
  38 # Shadow mode
  39 SHADOW_NONE, SHADOW_LEFT, SHADOW_RIGHT = 0, 1, 2
  40
  41 OP_CLICK_LEFT, OP_CLICK_RIGHT, OP_DRAG_LEFT, OP_DRAG_RIGHT = 1, 2, 4, 8
  42 OP_ALL = OP_CLICK_LEFT | OP_CLICK_RIGHT | OP_DRAG_LEFT | OP_DRAG_RIGHT
  43
  44 # Sub-modes for branching attachment mode
  45 BRANCHING_ATTACHMENT_NORMAL = 1
  46 BRANCHING_ATTACHMENT_BLOB = 2
  47
  48 # logical function to use when drawing rubberband boxes, etc.
  49 OGLRBLF = wx.INVERT
  50
  51 CONTROL_POINT_SIZE = 6
  52
  53 # Types of arrowhead
  54 # (i) Built-in
  55 ARROW_HOLLOW_CIRCLE   = 1
  56 ARROW_FILLED_CIRCLE   = 2
  57 ARROW_ARROW           = 3
  58 ARROW_SINGLE_OBLIQUE  = 4
  59 ARROW_DOUBLE_OBLIQUE  = 5
  60 # (ii) Custom
  61 ARROW_METAFILE        = 20
  62
  63 # Position of arrow on line
  64 ARROW_POSITION_START  = 0
  65 ARROW_POSITION_END    = 1
  66 ARROW_POSITION_MIDDLE = 2
  67
  68 # Line alignment flags
  69 # Vertical by default
  70 LINE_ALIGNMENT_HORIZ              = 1
  71 LINE_ALIGNMENT_VERT               = 0
  72 LINE_ALIGNMENT_TO_NEXT_HANDLE     = 2
  73 LINE_ALIGNMENT_NONE               = 0
  74
  75
  76
  77 # Format a string to a list of strings that fit in the given box.
  78 # Interpret %n and 10 or 13 as a new line.
  79 def FormatText(dc, text, width, height, formatMode):
  80     i = 0
  81     word = ""
  82     word_list = []
  83     end_word = False
  84     new_line = False
  85     while i < len(text):
  86         if text[i] == "%":
  87             i += 1
  88             if i == len(text):
  89                 word += "%"
  90             else:
  91                 if text[i] == "n":
  92                     new_line = True
  93                     end_word = True
  94                     i += 1
  95                 else:
  96                     word += "%" + text[i]
  97                     i += 1
  98         elif text[i] in ["\012","\015"]:
  99             new_line = True
 100             end_word = True
 101             i += 1
 102         elif text[i] == " ":
 103             end_word = True
 104             i += 1
 105         else:
 106             word += text[i]
 107             i += 1
 108
 109         if i == len(text):
 110             end_word = True
 111
 112         if end_word:
 113             word_list.append(word)
 114             word = ""
 115             end_word = False
 116         if new_line:
 117             word_list.append(None)
 118             new_line = False
 119
 120     # Now, make a list of strings which can fit in the box
 121     string_list = []
 122     buffer = ""
 123     for s in word_list:
 124         oldBuffer = buffer
 125         if s is None:
 126             # FORCE NEW LINE
 127             if len(buffer) > 0:
 128                 string_list.append(buffer)
 129             buffer = ""
 130         else:
 131             if len(buffer):
 132                 buffer += " "
 133             buffer += s
 134             x, y = dc.GetTextExtent(buffer)
 135
 136             # Don't fit within the bounding box if we're fitting
 137             # shape to contents
 138             if (x > width) and not (formatMode & FORMAT_SIZE_TO_CONTENTS):
 139                 # Deal with first word being wider than box
 140                 if len(oldBuffer):
 141                     string_list.append(oldBuffer)
 142                 buffer = s
 143     if len(buffer):
 144         string_list.append(buffer)
 145
 146     return string_list
 147
 148
 149
 150 def GetCentredTextExtent(dc, text_list, xpos = 0, ypos = 0, width = 0, height = 0):
 151     if not text_list:
 152         return 0, 0
 153
 154     max_width = 0
 155     for line in text_list:
 156         current_width, char_height = dc.GetTextExtent(line.GetText())
 157         if current_width > max_width:
 158             max_width = current_width
 159
 160     return max_width, len(text_list) * char_height
 161
 162
 163
 164 def CentreText(dc, text_list, xpos, ypos, width, height, formatMode):
 165     if not text_list:
 166         return
 167
 168     # First, get maximum dimensions of box enclosing text
 169     char_height = 0
 170     max_width = 0
 171     current_width = 0
 172
 173     # Store text extents for speed
 174     widths = []
 175     for line in text_list:
 176         current_width, char_height = dc.GetTextExtent(line.GetText())
 177         widths.append(current_width)
 178         if current_width > max_width:
 179             max_width = current_width
 180
 181     max_height = len(text_list) * char_height
 182
 183     if formatMode & FORMAT_CENTRE_VERT:
 184         if max_height < height:
 185             yoffset = ypos - height / 2.0 + (height - max_height) / 2.0
 186         else:
 187             yoffset = ypos - height / 2.0
 188         yOffset = ypos
 189     else:
 190         yoffset = 0.0
 191         yOffset = 0.0
 192
 193     if formatMode & FORMAT_CENTRE_HORIZ:
 194         xoffset = xpos - width / 2.0
 195         xOffset = xpos
 196     else:
 197         xoffset = 0.0
 198         xOffset = 0.0
 199
 200     for i, line in enumerate(text_list):
 201         if formatMode & FORMAT_CENTRE_HORIZ and widths[i] < width:
 202             x = (width - widths[i]) / 2.0 + xoffset
 203         else:
 204             x = xoffset
 205         y = i * char_height + yoffset
 206
 207         line.SetX(x - xOffset)
 208         line.SetY(y - yOffset)
 209
 210
 211
 212 def DrawFormattedText(dc, text_list, xpos, ypos, width, height, formatMode):
 213     if formatMode & FORMAT_CENTRE_HORIZ:
 214         xoffset = xpos
 215     else:
 216         xoffset = xpos - width / 2.0
 217
 218     if formatMode & FORMAT_CENTRE_VERT:
 219         yoffset = ypos
 220     else:
 221         yoffset = ypos - height / 2.0
 222
 223     # +1 to allow for rounding errors
 224     dc.SetClippingRegion(xpos - width / 2.0, ypos - height / 2.0, width + 1, height + 1)
 225
 226     for line in text_list:
 227         dc.DrawText(line.GetText(), xoffset + line.GetX(), yoffset + line.GetY())
 228
 229     dc.DestroyClippingRegion()
 230
 231
 232
 233 def RoughlyEqual(val1, val2, tol = 0.00001):
 234     return val1 < (val2 + tol) and val1 > (val2 - tol) and \
 235            val2 < (val1 + tol) and val2 > (val1 - tol)
 236
 237
 238
 239 def FindEndForBox(width, height, x1, y1, x2, y2):
 240     xvec = [x1 - width / 2.0, x1 - width / 2.0, x1 + width / 2.0, x1 + width / 2.0, x1 - width / 2.0]
 241     yvec = [y1 - height / 2.0, y1 + height / 2.0, y1 + height / 2.0, y1 - height / 2.0, y1 - height / 2.0]
 242
 243     return FindEndForPolyline(xvec, yvec, x2, y2, x1, y1)
 244
 245
 246
 247 def CheckLineIntersection(x1, y1, x2, y2, x3, y3, x4, y4):
 248     denominator_term = (y4 - y3) * (x2 - x1) - (y2 - y1) * (x4 - x3)
 249     numerator_term = (x3 - x1) * (y4 - y3) + (x4 - x3) * (y1 - y3)
 250
 251     length_ratio = 1.0
 252     k_line = 1.0
 253
 254     # Check for parallel lines
 255     if denominator_term < 0.005 and denominator_term > -0.005:
 256         line_constant = -1.0
 257     else:
 258         line_constant = float(numerator_term) / denominator_term
 259
 260     # Check for intersection
 261     if line_constant < 1.0 and line_constant > 0.0:
 262         # Now must check that other line hits
 263         if (y4 - y3) < 0.005 and (y4 - y3) > -0.005:
 264             k_line = (x1 - x3 + line_constant * (x2 - x1)) / (x4 - x3)
 265         else:
 266             k_line = (y1 - y3 + line_constant * (y2 - y1)) / (y4 - y3)
 267         if k_line >= 0 and k_line < 1:
 268             length_ratio = line_constant
 269         else:
 270             k_line = 1
 271
 272     return length_ratio, k_line
 273
 274
 275
 276 def FindEndForPolyline(xvec, yvec, x1, y1, x2, y2):
 277     lastx = xvec[0]
 278     lasty = yvec[0]
 279
 280     min_ratio = 1.0
 281
 282     for i in range(1, len(xvec)):
 283         line_ratio, other_ratio = CheckLineIntersection(x1, y1, x2, y2, lastx, lasty, xvec[i], yvec[i])
 284         lastx = xvec[i]
 285         lasty = yvec[i]
 286
 287         if line_ratio < min_ratio:
 288             min_ratio = line_ratio
 289
 290     # Do last (implicit) line if last and first doubles are not identical
 291     if not (xvec[0] == lastx and yvec[0] == lasty):
 292         line_ratio, other_ratio = CheckLineIntersection(x1, y1, x2, y2, lastx, lasty, xvec[0], yvec[0])
 293         if line_ratio < min_ratio:
 294             min_ratio = line_ratio
 295
 296     return x1 + (x2 - x1) * min_ratio, y1 + (y2 - y1) * min_ratio
 297
 298
 299
 300 def PolylineHitTest(xvec, yvec, x1, y1, x2, y2):
 301     isAHit = False
 302     lastx = xvec[0]
 303     lasty = yvec[0]
 304
 305     min_ratio = 1.0
 306
 307     for i in range(1, len(xvec)):
 308         line_ratio, other_ratio = CheckLineIntersection(x1, y1, x2, y2, lastx, lasty, xvec[i], yvec[i])
 309         if line_ratio != 1.0:
 310             isAHit = True
 311         lastx = xvec[i]
 312         lasty = yvec[i]
 313
 314         if line_ratio < min_ratio:
 315             min_ratio = line_ratio
 316
 317     # Do last (implicit) line if last and first doubles are not identical
 318     if not (xvec[0] == lastx and yvec[0] == lasty):
 319         line_ratio, other_ratio = CheckLineIntersection(x1, y1, x2, y2, lastx, lasty, xvec[0], yvec[0])
 320         if line_ratio != 1.0:
 321             isAHit = True
 322
 323     return isAHit
 324
 325
 326
 327 def GraphicsStraightenLine(point1, point2):
 328     dx = point2[0] - point1[0]
 329     dy = point2[1] - point1[1]
 330
 331     if dx == 0:
 332         return
 333     elif abs(float(dy) / dx) > 1:
 334         point2[0] = point1[0]
 335     else:
 336         point2[1] = point1[1]
 337
 338
 339
 340 def GetPointOnLine(x1, y1, x2, y2, length):
 341     l = math.sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1))
 342     if l < 0.01:
 343         l = 0.01
 344
 345     i_bar = (x2 - x1) / l
 346     j_bar = (y2 - y1) / l
 347
 348     return -length * i_bar + x2, -length * j_bar + y2
 349
 350
 351
 352 def GetArrowPoints(x1, y1, x2, y2, length, width):
 353     l = math.sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1))
 354
 355     if l < 0.01:
 356         l = 0.01
 357
 358     i_bar = (x2 - x1) / l
 359     j_bar = (y2 - y1) / l
 360
 361     x3 = -length * i_bar + x2
 362     y3 = -length * j_bar + y2
 363
 364     return x2, y2, width * -j_bar + x3, width * i_bar + y3, -width * -j_bar + x3, -width * i_bar + y3
 365
 366
 367
 368 def DrawArcToEllipse(x1, y1, width1, height1, x2, y2, x3, y3):
 369     a1 = width1 / 2.0
 370     b1 = height1 / 2.0
 371
 372     # Check that x2 != x3
 373     if abs(x2 - x3) < 0.05:
 374         x4 = x2
 375         if y3 > y2:
 376             y4 = y1 - math.sqrt((b1 * b1 - (((x2 - x1) * (x2 - x1)) * (b1 * b1) / (a1 * a1))))
 377         else:
 378             y4 = y1 + math.sqrt((b1 * b1 - (((x2 - x1) * (x2 - x1)) * (b1 * b1) / (a1 * a1))))
 379         return x4, y4
 380
 381     # Calculate the x and y coordinates of the point where arc intersects ellipse
 382     A = (1 / (a1 * a1))
 383     B = ((y3 - y2) * (y3 - y2)) / ((x3 - x2) * (x3 - x2) * b1 * b1)
 384     C = (2 * (y3 - y2) * (y2 - y1)) / ((x3 - x2) * b1 * b1)
 385     D = ((y2 - y1) * (y2 - y1)) / (b1 * b1)
 386     E = (A + B)
 387     F = (C - (2 * A * x1) - (2 * B * x2))
 388     G = ((A * x1 * x1) + (B * x2 * x2) - (C * x2) + D - 1)
 389     H = (float(y3 - y2) / (x3 - x2))
 390     K = ((F * F) - (4 * E * G))
 391
 392     if K >= 0:
 393         # In this case the line intersects the ellipse, so calculate intersection
 394         if x2 >= x1:
 395             ellipse1_x = ((F * -1) + math.sqrt(K)) / (2 * E)
 396             ellipse1_y = ((H * (ellipse1_x - x2)) + y2)
 397         else:
 398             ellipse1_x = (((F * -1) - math.sqrt(K)) / (2 * E))
 399             ellipse1_y = ((H * (ellipse1_x - x2)) + y2)
 400     else:
 401         # in this case, arc does not intersect ellipse, so just draw arc
 402         ellipse1_x = x3
 403         ellipse1_y = y3
 404
 405     return ellipse1_x, ellipse1_y
 406
 407
 408
 409 def FindEndForCircle(radius, x1, y1, x2, y2):
 410     H = math.sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1))
 411
 412     if H == 0:
 413         return x1, y1
 414     else:
 415         return radius * (x2 - x1) / H + x1, radius * (y2 - y1) / H + y1