def canvasToWorld(self, xpos, ypos):
"""Transform the given x/y canvas coordinates into the display
coordinate system.
"""
b = self.__displayCtx.bounds
width, height = self.GetSize()
# The first step is to invert the mouse
# coordinates w.r.t. the viewport.
#
# The canvas x axis corresponds to
# (-xhalf, xhalf), and the canvas y
# corresponds to (-yhalf, yhalf) -
# see routines.show3D.
xlen, ylen = glroutines.adjust(b.xlen, b.ylen, width, height)
xhalf = 0.5 * xlen
yhalf = 0.5 * ylen
# Pixels to viewport coordinates
xpos = xlen * (xpos / float(width)) - xhalf
ypos = ylen * (ypos / float(height)) - yhalf
# The second step is to transform from
# viewport coords into model-view coords.
# This is easy - transform by the inverse
# MV matrix.
#
# z=-1 because the camera is offset by 1
# on the depth axis (see __setViewport).
pos = np.array([xpos, ypos, -1])
xform = transform.invert(self.__viewMat)
pos = transform.transform(pos, xform)
return pos
def __drawLegend(self):
"""Draws a legend in the bottom left corner of the screen, showing
anatomical orientation.
"""
copts = self.opts
b = self.__displayCtx.bounds
w, h = self.GetSize()
xlen, ylen = glroutines.adjust(b.xlen, b.ylen, w, h)
# A line for each axis
vertices = np.zeros((6, 3), dtype=np.float32)
vertices[0, :] = [-1, 0, 0]
vertices[1, :] = [1, 0, 0]
vertices[2, :] = [0, -1, 0]
vertices[3, :] = [0, 1, 0]
vertices[4, :] = [0, 0, -1]
vertices[5, :] = [0, 0, 1]
# Each axis line is scaled to
# 60 pixels, and the legend is
# offset from the bottom-left
# corner by twice this amount.
scale = [xlen * 30.0 / w] * 3
offset = [
-0.5 * xlen + 2.0 * scale[0], -0.5 * ylen + 2.0 * scale[1], 0
]
# Apply the current camera
# angle and rotation settings
# to the legend vertices. Offset
# anatomical labels off each
# axis line by a small amount.
rotation = transform.decompose(self.__viewMat)[2]
xform = transform.compose(scale, offset, rotation)
labelPoses = transform.transform(vertices * 1.2, xform)
vertices = transform.transform(vertices, xform)
# Draw the legend lines
gl.glDisable(gl.GL_DEPTH_TEST)
gl.glColor3f(*copts.cursorColour[:3])
gl.glLineWidth(2)
gl.glBegin(gl.GL_LINES)
gl.glVertex3f(*vertices[0])
gl.glVertex3f(*vertices[1])
gl.glVertex3f(*vertices[2])
gl.glVertex3f(*vertices[3])
gl.glVertex3f(*vertices[4])
gl.glVertex3f(*vertices[5])
gl.glEnd()
# Figure out the anatomical
# labels for each axis.
overlay = self.__displayCtx.getSelectedOverlay()
dopts = self.__displayCtx.getOpts(overlay)
labels = dopts.getLabels()[0]
# getLabels returns (xlo, ylo, zlo, xhi, yhi, zhi) -
# - rearrange them to (xlo, xhi, ylo, yhi, zlo, zhi)
labels = [
labels[0], labels[3], labels[1], labels[4], labels[2], labels[5]
]
canvas = np.array([w, h])
view = np.array([xlen, ylen])
# Draw each label
for i in range(6):
# Calculate pixel x/y
# location for this label
xx, xy = canvas * (labelPoses[i, :2] + 0.5 * view) / view
# Calculate the size of the label
# in pixels, so we can centre the
# label
tw, th = glroutines.text2D(labels[i], (xx, xy),
10, (w, h),
calcSize=True)
# Draw the text
xx -= 0.5 * tw
xy -= 0.5 * th
gl.glColor3f(*copts.legendColour[:3])
glroutines.text2D(labels[i], (xx, xy), 10, (w, h))
def __genViewMatrix(self, w, h):
"""Generate and return a transformation matrix to be used as the
model-view matrix. This includes applying the current :attr:`zoom`,
:attr:`rotation` and :attr:`offset` settings, and configuring
the camera. This method is called by :meth:`__setViewport`.
:arg w: Canvas width in pixels
:arg h: Canvas height in pixels
"""
opts = self.opts
b = self.__displayCtx.bounds
centre = [
b.xlo + 0.5 * b.xlen, b.ylo + 0.5 * b.ylen, b.zlo + 0.5 * b.zlen
]
# The MV matrix comprises (in this order):
#
# - A rotation (the rotation property)
#
# - Camera configuration. With no rotation, the
# camera will be looking towards the positive
# Y axis (i.e. +y is forwards), and oriented
# towards the positive Z axis (i.e. +z is up)
#
# - A translation (the offset property)
# - A scaling (the zoom property)
# Scaling and rotation matrices. Rotation
# is always around the centre of the
# displaycontext bounds (the bounding
# box which contains all loaded overlays).
scale = opts.zoom / 100.0
scale = transform.scaleOffsetXform([scale] * 3, 0)
rotate = transform.rotMatToAffine(opts.rotation, centre)
# The offset property is defined in x/y
# pixels, normalised to [-1, 1]. We need
# to convert them into viewport space,
# where the horizontal axis maps to
# (-xhalf, xhalf), and the vertical axis
# maps to (-yhalf, yhalf). See
# gl.routines.ortho.
offset = np.array(opts.offset[:] + [0])
xlen, ylen = glroutines.adjust(b.xlen, b.ylen, w, h)
offset[0] = xlen * offset[0] / 2
offset[1] = ylen * offset[1] / 2
offset = transform.scaleOffsetXform(1, offset)
# And finally the camera.
eye = list(centre)
eye[1] += 1
up = [0, 0, 1]
camera = glroutines.lookAt(eye, centre, up)
# Order is very important!
xform = transform.concat(offset, scale, camera, rotate)
np.array(xform, dtype=np.float32)
self.__viewOffset = offset
self.__viewScale = scale
self.__viewRotate = rotate
self.__viewCamera = camera
self.__viewMat = xform
def __drawLegend(self):
"""Draws a legend in the bottom left corner of the screen, showing
anatomical orientation.
"""
copts = self.opts
b = self.__displayCtx.bounds
w, h = self.GetSize()
xlen, ylen = glroutines.adjust(b.xlen, b.ylen, w, h)
# A line for each axis
vertices = np.zeros((6, 3), dtype=np.float32)
vertices[0, :] = [-1, 0, 0]
vertices[1, :] = [1, 0, 0]
vertices[2, :] = [0, -1, 0]
vertices[3, :] = [0, 1, 0]
vertices[4, :] = [0, 0, -1]
vertices[5, :] = [0, 0, 1]
# Each axis line is scaled to
# 60 pixels, and the legend is
# offset from the bottom-left
# corner by twice this amount.
scale = [xlen * 30.0 / w] * 3
offset = [
-0.5 * xlen + 2.0 * scale[0], -0.5 * ylen + 2.0 * scale[1], 0
]
# Apply the current camera
# angle and rotation settings
# to the legend vertices. Offset
# anatomical labels off each
# axis line by a small amount.
rotation = affine.decompose(self.__viewMat)[2]
xform = affine.compose(scale, offset, rotation)
labelPoses = affine.transform(vertices * 1.2, xform)
vertices = affine.transform(vertices, xform)
# Draw the legend lines
gl.glDisable(gl.GL_DEPTH_TEST)
gl.glColor3f(*copts.cursorColour[:3])
gl.glLineWidth(2)
gl.glBegin(gl.GL_LINES)
gl.glVertex3f(*vertices[0])
gl.glVertex3f(*vertices[1])
gl.glVertex3f(*vertices[2])
gl.glVertex3f(*vertices[3])
gl.glVertex3f(*vertices[4])
gl.glVertex3f(*vertices[5])
gl.glEnd()
canvas = np.array([w, h])
view = np.array([xlen, ylen])
# Draw each label
for i, label in enumerate(self.__legendLabels):
# Calculate pixel x/y
# location for this label
xx, xy = canvas * (labelPoses[i, :2] + 0.5 * view) / view
label.xpix = xx
label.ypix = xy
label.draw(w, h)