cd5cb880d0
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@29265 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
416 lines
11 KiB
Python
416 lines
11 KiB
Python
# -*- coding: iso-8859-1 -*-
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#----------------------------------------------------------------------------
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# Name: oglmisc.py
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# Purpose: Miscellaneous OGL support functions
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#
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# Author: Pierre Hjälm (from C++ original by Julian Smart)
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#
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# Created: 2004-05-08
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# RCS-ID: $Id$
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# Copyright: (c) 2004 Pierre Hjälm - 1998 Julian Smart
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# Licence: wxWindows license
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#----------------------------------------------------------------------------
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import math
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import wx
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# Control point types
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# Rectangle and most other shapes
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CONTROL_POINT_VERTICAL = 1
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CONTROL_POINT_HORIZONTAL = 2
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CONTROL_POINT_DIAGONAL = 3
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# Line
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CONTROL_POINT_ENDPOINT_TO = 4
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CONTROL_POINT_ENDPOINT_FROM = 5
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CONTROL_POINT_LINE = 6
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# Types of formatting: can be combined in a bit list
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FORMAT_NONE = 0 # Left justification
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FORMAT_CENTRE_HORIZ = 1 # Centre horizontally
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FORMAT_CENTRE_VERT = 2 # Centre vertically
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FORMAT_SIZE_TO_CONTENTS = 4 # Resize shape to contents
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# Attachment modes
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ATTACHMENT_MODE_NONE, ATTACHMENT_MODE_EDGE, ATTACHMENT_MODE_BRANCHING = 0, 1, 2
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# Shadow mode
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SHADOW_NONE, SHADOW_LEFT, SHADOW_RIGHT = 0, 1, 2
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OP_CLICK_LEFT, OP_CLICK_RIGHT, OP_DRAG_LEFT, OP_DRAG_RIGHT = 1, 2, 4, 8
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OP_ALL = OP_CLICK_LEFT | OP_CLICK_RIGHT | OP_DRAG_LEFT | OP_DRAG_RIGHT
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# Sub-modes for branching attachment mode
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BRANCHING_ATTACHMENT_NORMAL = 1
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BRANCHING_ATTACHMENT_BLOB = 2
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# logical function to use when drawing rubberband boxes, etc.
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OGLRBLF = wx.INVERT
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CONTROL_POINT_SIZE = 6
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# Types of arrowhead
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# (i) Built-in
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ARROW_HOLLOW_CIRCLE = 1
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ARROW_FILLED_CIRCLE = 2
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ARROW_ARROW = 3
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ARROW_SINGLE_OBLIQUE = 4
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ARROW_DOUBLE_OBLIQUE = 5
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# (ii) Custom
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ARROW_METAFILE = 20
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# Position of arrow on line
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ARROW_POSITION_START = 0
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ARROW_POSITION_END = 1
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ARROW_POSITION_MIDDLE = 2
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# Line alignment flags
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# Vertical by default
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LINE_ALIGNMENT_HORIZ = 1
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LINE_ALIGNMENT_VERT = 0
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LINE_ALIGNMENT_TO_NEXT_HANDLE = 2
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LINE_ALIGNMENT_NONE = 0
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# Format a string to a list of strings that fit in the given box.
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# Interpret %n and 10 or 13 as a new line.
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def FormatText(dc, text, width, height, formatMode):
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i = 0
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word = ""
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word_list = []
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end_word = False
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new_line = False
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while i < len(text):
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if text[i] == "%":
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i += 1
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if i == len(text):
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word += "%"
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else:
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if text[i] == "n":
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new_line = True
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end_word = True
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i += 1
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else:
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word += "%" + text[i]
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i += 1
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elif text[i] in ["\012","\015"]:
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new_line = True
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end_word = True
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i += 1
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elif text[i] == " ":
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end_word = True
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i += 1
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else:
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word += text[i]
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i += 1
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if i == len(text):
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end_word = True
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if end_word:
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word_list.append(word)
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word = ""
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end_word = False
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if new_line:
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word_list.append(None)
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new_line = False
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# Now, make a list of strings which can fit in the box
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string_list = []
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buffer = ""
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for s in word_list:
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oldBuffer = buffer
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if s is None:
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# FORCE NEW LINE
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if len(buffer) > 0:
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string_list.append(buffer)
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buffer = ""
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else:
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if len(buffer):
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buffer += " "
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buffer += s
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x, y = dc.GetTextExtent(buffer)
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# Don't fit within the bounding box if we're fitting
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# shape to contents
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if (x > width) and not (formatMode & FORMAT_SIZE_TO_CONTENTS):
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# Deal with first word being wider than box
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if len(oldBuffer):
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string_list.append(oldBuffer)
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buffer = s
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if len(buffer):
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string_list.append(buffer)
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return string_list
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def GetCentredTextExtent(dc, text_list, xpos = 0, ypos = 0, width = 0, height = 0):
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if not text_list:
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return 0, 0
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max_width = 0
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for line in text_list:
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current_width, char_height = dc.GetTextExtent(line.GetText())
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if current_width > max_width:
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max_width = current_width
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return max_width, len(text_list) * char_height
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def CentreText(dc, text_list, xpos, ypos, width, height, formatMode):
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if not text_list:
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return
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# First, get maximum dimensions of box enclosing text
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char_height = 0
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max_width = 0
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current_width = 0
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# Store text extents for speed
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widths = []
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for line in text_list:
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current_width, char_height = dc.GetTextExtent(line.GetText())
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widths.append(current_width)
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if current_width > max_width:
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max_width = current_width
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max_height = len(text_list) * char_height
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if formatMode & FORMAT_CENTRE_VERT:
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if max_height < height:
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yoffset = ypos - height / 2.0 + (height - max_height) / 2.0
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else:
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yoffset = ypos - height / 2.0
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yOffset = ypos
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else:
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yoffset = 0.0
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yOffset = 0.0
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if formatMode & FORMAT_CENTRE_HORIZ:
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xoffset = xpos - width / 2.0
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xOffset = xpos
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else:
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xoffset = 0.0
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xOffset = 0.0
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for i, line in enumerate(text_list):
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if formatMode & FORMAT_CENTRE_HORIZ and widths[i] < width:
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x = (width - widths[i]) / 2.0 + xoffset
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else:
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x = xoffset
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y = i * char_height + yoffset
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line.SetX(x - xOffset)
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line.SetY(y - yOffset)
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def DrawFormattedText(dc, text_list, xpos, ypos, width, height, formatMode):
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if formatMode & FORMAT_CENTRE_HORIZ:
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xoffset = xpos
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else:
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xoffset = xpos - width / 2.0
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if formatMode & FORMAT_CENTRE_VERT:
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yoffset = ypos
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else:
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yoffset = ypos - height / 2.0
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# +1 to allow for rounding errors
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dc.SetClippingRegion(xpos - width / 2.0, ypos - height / 2.0, width + 1, height + 1)
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for line in text_list:
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dc.DrawText(line.GetText(), xoffset + line.GetX(), yoffset + line.GetY())
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dc.DestroyClippingRegion()
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def RoughlyEqual(val1, val2, tol = 0.00001):
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return val1 < (val2 + tol) and val1 > (val2 - tol) and \
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val2 < (val1 + tol) and val2 > (val1 - tol)
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def FindEndForBox(width, height, x1, y1, x2, y2):
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xvec = [x1 - width / 2.0, x1 - width / 2.0, x1 + width / 2.0, x1 + width / 2.0, x1 - width / 2.0]
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yvec = [y1 - height / 2.0, y1 + height / 2.0, y1 + height / 2.0, y1 - height / 2.0, y1 - height / 2.0]
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return FindEndForPolyline(xvec, yvec, x2, y2, x1, y1)
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def CheckLineIntersection(x1, y1, x2, y2, x3, y3, x4, y4):
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denominator_term = (y4 - y3) * (x2 - x1) - (y2 - y1) * (x4 - x3)
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numerator_term = (x3 - x1) * (y4 - y3) + (x4 - x3) * (y1 - y3)
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length_ratio = 1.0
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k_line = 1.0
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# Check for parallel lines
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if denominator_term < 0.005 and denominator_term > -0.005:
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line_constant = -1.0
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else:
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line_constant = float(numerator_term) / denominator_term
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# Check for intersection
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if line_constant < 1.0 and line_constant > 0.0:
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# Now must check that other line hits
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if (y4 - y3) < 0.005 and (y4 - y3) > -0.005:
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k_line = (x1 - x3 + line_constant * (x2 - x1)) / (x4 - x3)
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else:
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k_line = (y1 - y3 + line_constant * (y2 - y1)) / (y4 - y3)
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if k_line >= 0 and k_line < 1:
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length_ratio = line_constant
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else:
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k_line = 1
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return length_ratio, k_line
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def FindEndForPolyline(xvec, yvec, x1, y1, x2, y2):
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lastx = xvec[0]
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lasty = yvec[0]
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min_ratio = 1.0
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for i in range(1, len(xvec)):
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line_ratio, other_ratio = CheckLineIntersection(x1, y1, x2, y2, lastx, lasty, xvec[i], yvec[i])
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lastx = xvec[i]
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lasty = yvec[i]
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if line_ratio < min_ratio:
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min_ratio = line_ratio
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# Do last (implicit) line if last and first doubles are not identical
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if not (xvec[0] == lastx and yvec[0] == lasty):
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line_ratio, other_ratio = CheckLineIntersection(x1, y1, x2, y2, lastx, lasty, xvec[0], yvec[0])
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if line_ratio < min_ratio:
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min_ratio = line_ratio
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return x1 + (x2 - x1) * min_ratio, y1 + (y2 - y1) * min_ratio
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def PolylineHitTest(xvec, yvec, x1, y1, x2, y2):
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isAHit = False
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lastx = xvec[0]
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lasty = yvec[0]
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min_ratio = 1.0
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for i in range(1, len(xvec)):
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line_ratio, other_ratio = CheckLineIntersection(x1, y1, x2, y2, lastx, lasty, xvec[i], yvec[i])
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if line_ratio != 1.0:
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isAHit = True
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lastx = xvec[i]
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lasty = yvec[i]
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if line_ratio < min_ratio:
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min_ratio = line_ratio
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# Do last (implicit) line if last and first doubles are not identical
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if not (xvec[0] == lastx and yvec[0] == lasty):
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line_ratio, other_ratio = CheckLineIntersection(x1, y1, x2, y2, lastx, lasty, xvec[0], yvec[0])
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if line_ratio != 1.0:
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isAHit = True
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return isAHit
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def GraphicsStraightenLine(point1, point2):
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dx = point2[0] - point1[0]
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dy = point2[1] - point1[1]
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if dx == 0:
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return
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elif abs(float(dy) / dx) > 1:
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point2[0] = point1[0]
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else:
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point2[1] = point1[1]
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def GetPointOnLine(x1, y1, x2, y2, length):
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l = math.sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1))
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if l < 0.01:
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l = 0.01
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i_bar = (x2 - x1) / l
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j_bar = (y2 - y1) / l
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return -length * i_bar + x2, -length * j_bar + y2
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def GetArrowPoints(x1, y1, x2, y2, length, width):
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l = math.sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1))
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if l < 0.01:
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l = 0.01
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i_bar = (x2 - x1) / l
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j_bar = (y2 - y1) / l
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x3 = -length * i_bar + x2
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y3 = -length * j_bar + y2
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return x2, y2, width * -j_bar + x3, width * i_bar + y3, -width * -j_bar + x3, -width * i_bar + y3
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def DrawArcToEllipse(x1, y1, width1, height1, x2, y2, x3, y3):
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a1 = width1 / 2.0
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b1 = height1 / 2.0
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# Check that x2 != x3
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if abs(x2 - x3) < 0.05:
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x4 = x2
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if y3 > y2:
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y4 = y1 - math.sqrt((b1 * b1 - (((x2 - x1) * (x2 - x1)) * (b1 * b1) / (a1 * a1))))
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else:
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y4 = y1 + math.sqrt((b1 * b1 - (((x2 - x1) * (x2 - x1)) * (b1 * b1) / (a1 * a1))))
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return x4, y4
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# Calculate the x and y coordinates of the point where arc intersects ellipse
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A = (1 / (a1 * a1))
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B = ((y3 - y2) * (y3 - y2)) / ((x3 - x2) * (x3 - x2) * b1 * b1)
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C = (2 * (y3 - y2) * (y2 - y1)) / ((x3 - x2) * b1 * b1)
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D = ((y2 - y1) * (y2 - y1)) / (b1 * b1)
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E = (A + B)
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F = (C - (2 * A * x1) - (2 * B * x2))
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G = ((A * x1 * x1) + (B * x2 * x2) - (C * x2) + D - 1)
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H = (float(y3 - y2) / (x3 - x2))
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K = ((F * F) - (4 * E * G))
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if K >= 0:
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# In this case the line intersects the ellipse, so calculate intersection
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if x2 >= x1:
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ellipse1_x = ((F * -1) + math.sqrt(K)) / (2 * E)
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ellipse1_y = ((H * (ellipse1_x - x2)) + y2)
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else:
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ellipse1_x = (((F * -1) - math.sqrt(K)) / (2 * E))
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ellipse1_y = ((H * (ellipse1_x - x2)) + y2)
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else:
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# in this case, arc does not intersect ellipse, so just draw arc
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ellipse1_x = x3
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ellipse1_y = y3
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return ellipse1_x, ellipse1_y
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def FindEndForCircle(radius, x1, y1, x2, y2):
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H = math.sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1))
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if H == 0:
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return x1, y1
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else:
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return radius * (x2 - x1) / H + x1, radius * (y2 - y1) / H + y1
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