class LabelOverlayManager(object):
'''
Manages rendering of which appears at fixed points on the screen, rather
than text which appears at fixed points in the world.
'''
class Label(LabelMaker.LabelData):
'''
Holds state on a single label
'''
def __init__(self, text, color, size):
'''
constructor
'''
LabelMaker.LabelData.__init__(self, text, color, size)
self.enabled = True
self.x, self.y = 0, 0
self.alpha = 1.0
def initialize(self, gl, render_state, labels, texture_manager):
self.labels = labels[:] # deep copy
self.texture = self.label_maker.initialize(gl, render_state,
self.labels,
texture_manager)
def release_textures(self, gl):
if self.texture != None:
self.texture.shutdown(gl)
self.texture = None
def draw(self, gl, screen_width, screen_height):
if self.texture == None or self.labels == []:
return
gl.glEnable(gl.GL_TEXTURE_2D)
self.texture.bind(gl)
gl.glEnable(gl.GL_BLEND)
gl.glBlendFunc(gl.GL_SRC_ALPHA, gl.GL_ONE_MINUS_SRC_ALPHA)
gl.glTexEnvx(gl.GL_TEXTURE_ENV, gl.GL_TEXTURE_ENV_MODE, gl.GL_MODULATE)
gl.glEnableClientState(gl.GL_VERTEX_ARRAY)
gl.glEnableClientState(gl.GL_TEXTURE_COORD_ARRAY)
gl.glDisableClientState(gl.GL_COLOR_ARRAY)
# Change to orthographic projection, where the units in model view space
# are the same as in screen space.
gl.glMatrixMode(gl.GL_PROJECTION)
gl.glPushMatrix()
gl.glLoadIdentity()
gl.glOrthof(0, screen_width, 0, screen_height, -100, 100)
gl.glMatrixMode(gl.GL_MODELVIEW)
gl.glPushMatrix()
for label in self.labels:
if label.enabled:
x = label.x - label.width_in_pixels / 2
y = label.y
gl.glLoadIdentity()
# Move the label to the correct offset.
gl.glTranslatef(x, y, 0.0)
# Scale the label to the correct size.
gl.glScalef(label.width_in_pixels, label.height_in_pixels, 0.0)
# Set the alpha for the label.
gl.glColor4f(1, 1, 1, label.getAlpha())
# Draw the label.
self.vertex_buffer.set(gl)
gl.glTexCoordPointer(2, gl.GL_FIXED, 0, label.tex_coords)
self.index_buffer.draw(gl, gl.GL_TRIANGLES)
# Restore the old matrices.
gl.glMatrixMode(gl.GL_PROJECTION)
gl.glPopMatrix()
gl.glMatrixMode(gl.GL_MODELVIEW)
gl.glPopMatrix()
gl.glTexEnvf(gl.GL_TEXTURE_ENV, gl.GL_TEXTURE_ENV_MODE, gl.GL_REPLACE)
gl.glDisable(gl.GL_BLEND)
gl.glDisableClientState(gl.GL_TEXTURE_COORD_ARRAY)
gl.glDisable(gl.GL_TEXTURE_2D)
def __init__(self):
'''
Constructor
'''
self.labels = []
self.label_maker = LabelMaker(True)
self.texture = None
self.vertex_buffer = VertexBuffer(4, False)
self.index_buffer = IndexBuffer(6)
#private Paint mLabelPaint = new Paint();
#mLabelPaint.setAntiAlias(true);
self.vertex_buffer.add_point(0, 0, 0) # Bottom left
self.vertex_buffer.add_point(0, 1, 0) # Top left
self.vertex_buffer.add_point(1, 0, 0) # Bottom right
self.vertex_buffer.add_point(1, 1, 0) # Top right
# Triangle one: bottom left, top left, bottom right.
self.index_buffer.add_index(0)
self.index_buffer.add_index(1)
self.index_buffer.add_index(2)
# Triangle two: bottom right, top left, top right.
self.index_buffer.add_index(2)
self.index_buffer.add_index(1)
self.index_buffer.add_index(3)
class LabelOverlayManager(object):
"""
Manages rendering of which appears at fixed points on the screen, rather
than text which appears at fixed points in the world.
"""
class Label(LabelMaker.LabelData):
"""
Holds state on a single label
"""
def __init__(self, text, color, size):
"""
constructor
"""
LabelMaker.LabelData.__init__(self, text, color, size)
self.enabled = True
self.x, self.y = 0, 0
self.alpha = 1.0
def initialize(self, gl, render_state, labels, texture_manager):
self.labels = labels[:] # deep copy
self.texture = self.label_maker.initialize(gl, render_state, self.labels, texture_manager)
def release_textures(self, gl):
if self.texture != None:
self.texture.shutdown(gl)
self.texture = None
def draw(self, gl, screen_width, screen_height):
if self.texture == None or self.labels == []:
return
gl.glEnable(gl.GL_TEXTURE_2D)
self.texture.bind(gl)
gl.glEnable(gl.GL_BLEND)
gl.glBlendFunc(gl.GL_SRC_ALPHA, gl.GL_ONE_MINUS_SRC_ALPHA)
gl.glTexEnvx(gl.GL_TEXTURE_ENV, gl.GL_TEXTURE_ENV_MODE, gl.GL_MODULATE)
gl.glEnableClientState(gl.GL_VERTEX_ARRAY)
gl.glEnableClientState(gl.GL_TEXTURE_COORD_ARRAY)
gl.glDisableClientState(gl.GL_COLOR_ARRAY)
# Change to orthographic projection, where the units in model view space
# are the same as in screen space.
gl.glMatrixMode(gl.GL_PROJECTION)
gl.glPushMatrix()
gl.glLoadIdentity()
gl.glOrthof(0, screen_width, 0, screen_height, -100, 100)
gl.glMatrixMode(gl.GL_MODELVIEW)
gl.glPushMatrix()
for label in self.labels:
if label.enabled:
x = label.x - label.width_in_pixels / 2
y = label.y
gl.glLoadIdentity()
# Move the label to the correct offset.
gl.glTranslatef(x, y, 0.0)
# Scale the label to the correct size.
gl.glScalef(label.width_in_pixels, label.height_in_pixels, 0.0)
# Set the alpha for the label.
gl.glColor4f(1, 1, 1, label.getAlpha())
# Draw the label.
self.vertex_buffer.set(gl)
gl.glTexCoordPointer(2, gl.GL_FIXED, 0, label.tex_coords)
self.index_buffer.draw(gl, gl.GL_TRIANGLES)
# Restore the old matrices.
gl.glMatrixMode(gl.GL_PROJECTION)
gl.glPopMatrix()
gl.glMatrixMode(gl.GL_MODELVIEW)
gl.glPopMatrix()
gl.glTexEnvf(gl.GL_TEXTURE_ENV, gl.GL_TEXTURE_ENV_MODE, gl.GL_REPLACE)
gl.glDisable(gl.GL_BLEND)
gl.glDisableClientState(gl.GL_TEXTURE_COORD_ARRAY)
gl.glDisable(gl.GL_TEXTURE_2D)
def __init__(self):
"""
Constructor
"""
self.labels = []
self.label_maker = LabelMaker(True)
self.texture = None
self.vertex_buffer = VertexBuffer(4, False)
self.index_buffer = IndexBuffer(6)
# private Paint mLabelPaint = new Paint();
# mLabelPaint.setAntiAlias(true);
self.vertex_buffer.add_point(0, 0, 0) # Bottom left
self.vertex_buffer.add_point(0, 1, 0) # Top left
self.vertex_buffer.add_point(1, 0, 0) # Bottom right
self.vertex_buffer.add_point(1, 1, 0) # Top right
# Triangle one: bottom left, top left, bottom right.
self.index_buffer.add_index(0)
self.index_buffer.add_index(1)
self.index_buffer.add_index(2)
# Triangle two: bottom right, top left, top right.
self.index_buffer.add_index(2)
self.index_buffer.add_index(1)
self.index_buffer.add_index(3)
