Python bgl.glBegin() Examples

def _draw(self):
        l,t = self.pos
        w,h = self.size

        if debug_draw:
            bgl.glEnable(bgl.GL_BLEND)
            bgl.glBegin(bgl.GL_QUADS)
            bgl.glColor4f(0,1,1,0.5)
            bgl.glVertex2f(l, t)
            bgl.glVertex2f(l, t - h)
            bgl.glVertex2f(l + w, t - h)
            bgl.glVertex2f(l + w, t)
            bgl.glEnd()

        if self.background:
            bgl.glEnable(bgl.GL_BLEND)
            bgl.glColor4f(*self.background)
            bgl.glBegin(bgl.GL_QUADS)
            bgl.glVertex2f(l, t)
            bgl.glVertex2f(l+w, t)
            bgl.glVertex2f(l+w, t-h)
            bgl.glVertex2f(l, t-h)
            bgl.glEnd() 

def draw_2d_point(point_x, point_y, p_size=4, p_col=(1.0,1.0,1.0,1.0)):
    bgl.glEnable(bgl.GL_BLEND)
    #bgl.glColor4f(1.0, 1.0, 1.0, 0.5)
    #bgl.glLineWidth(2)

    bgl.glPointSize(p_size)
    coords = ((point_x, point_y), (point_x, point_y))
    batch = batch_for_shader(shader2d, 'POINTS', {"pos": coords})
    shader2d.bind()
    shader2d.uniform_float("color", (p_col[0], p_col[1], p_col[2], p_col[3]))
    batch.draw(shader2d)
    # bgl.glBegin(bgl.GL_POINTS)
    # bgl.glColor4f(p_col[0], p_col[1], p_col[2], p_col[3])
    # bgl.glVertex2f(point_x, point_y)
    # bgl.glEnd()

    # restore opengl defaults
    bgl.glLineWidth(1)
    bgl.glDisable(bgl.GL_BLEND) 

def draw(self, context, render=False):
        """
            render flag when rendering
        """

        # print("draw_line %s" % (type(self).__name__))
        bgl.glPushAttrib(bgl.GL_ENABLE_BIT)
        if self.style == bgl.GL_LINE_STIPPLE:
            bgl.glLineStipple(1, 0x9999)
        bgl.glEnable(self.style)
        bgl.glEnable(bgl.GL_BLEND)
        if render:
            # enable anti-alias on lines
            bgl.glEnable(bgl.GL_LINE_SMOOTH)
        bgl.glColor4f(*self.colour)
        bgl.glLineWidth(self.width)
        if self.closed:
            bgl.glBegin(bgl.GL_LINE_LOOP)
        else:
            bgl.glBegin(bgl.GL_LINE_STRIP)

        for pt in self.pts:
            p = self.position_2d_from_coord(context, pt, render)
            bgl.glVertex2f(p.x, p.y)
        self._end() 

def draw_callback_px(self, context):
    print("mouse points", len(self.mouse_path))

    font_id = 0  # XXX, need to find out how best to get this.

    # draw some text
    blf.position(font_id, 15, 30, 0)
    blf.size(font_id, 20, 72)
    blf.draw(font_id, "Hello Word " + str(len(self.mouse_path)))

    # 50% alpha, 2 pixel width line
    bgl.glEnable(bgl.GL_BLEND)
    bgl.glColor4f(0.0, 0.0, 0.0, 0.5)
    bgl.glLineWidth(2)

    bgl.glBegin(bgl.GL_LINE_STRIP)
    for x, y in self.mouse_path:
        bgl.glVertex2i(x, y)

    bgl.glEnd()

    # restore opengl defaults
    bgl.glLineWidth(1)
    bgl.glDisable(bgl.GL_BLEND)
    bgl.glColor4f(0.0, 0.0, 0.0, 1.0) 

def draw(self, context, render=False):
        """
            render flag when rendering
        """

        # print("draw_polygon")
        self.render = render
        bgl.glPushAttrib(bgl.GL_ENABLE_BIT)
        bgl.glEnable(bgl.GL_BLEND)
        if render:
            # enable anti-alias on polygons
            bgl.glEnable(bgl.GL_POLYGON_SMOOTH)
        bgl.glColor4f(*self.colour)
        bgl.glBegin(bgl.GL_POLYGON)

        for pt in self.pts:
            p = self.position_2d_from_coord(context, pt, render)
            bgl.glVertex2f(p.x, p.y)
        self._end() 

def draw_line(p1, p2, color, shadow=False, shadow_color=None):
    bgl.glEnable(bgl.GL_BLEND)
    bgl.glEnable(bgl.GL_LINE_SMOOTH)

    # Draw shadow.
    if shadow:
        bgl.glLineWidth(3.0)
        bgl.glColor4f(*shadow_color, 1.0)
        bgl.glBegin(bgl.GL_LINES)
        bgl.glVertex2f(*p1)
        bgl.glVertex2f(*p2)
        bgl.glEnd()

    # Draw line.
    bgl.glLineWidth(1.5 if shadow else 1.0)
    bgl.glColor3f(*color)
    bgl.glBegin(bgl.GL_LINES)
    bgl.glVertex2f(*p1)
    bgl.glVertex2f(*p2)
    bgl.glEnd()

    bgl.glLineWidth(1.0)
    bgl.glDisable(bgl.GL_LINE_SMOOTH) 

def draw3d_polyline(points, color, thickness, view_loc, view_ortho, stipple=False, zfar=0.997):
    if not points: return
    if stipple:
        bgl.glLineStipple(4, 0x5555)  #play with this later
        bgl.glEnable(bgl.GL_LINE_STIPPLE)
    bgl.glEnable(bgl.GL_BLEND)
    bgl.glColor4f(*color)
    bgl.glLineWidth(thickness)
    set_depthrange(0.0, zfar, points, view_loc, view_ortho)
    bgl.glBegin(bgl.GL_LINE_STRIP)
    for coord in points: bgl.glVertex3f(*coord)
    bgl.glEnd()
    bgl.glLineWidth(1)
    if stipple:
        bgl.glDisable(bgl.GL_LINE_STIPPLE)
        bgl.glEnable(bgl.GL_BLEND)  # back to uninterrupted lines 

def draw_circle(self, world_loc, radius, inner_ratio, color_outside, color_inside):
        bgl.glDepthRange(0, 0.9999)     # squeeze depth just a bit
        bgl.glEnable(bgl.GL_BLEND)
        bgl.glDepthMask(bgl.GL_FALSE)   # do not overwrite depth
        bgl.glEnable(bgl.GL_DEPTH_TEST)
        bgl.glDepthFunc(bgl.GL_LEQUAL)  # draw in front of geometry

        circleShader.enable()
        self.drawing.point_size(2.0 * radius)
        circleShader['uMVPMatrix'] = self.drawing.get_view_matrix_buffer()
        circleShader['uInOut']     = inner_ratio

        bgl.glBegin(bgl.GL_POINTS)
        circleShader['vOutColor'] = color_outside
        circleShader['vInColor']  = color_inside
        bgl.glVertex3f(*world_loc)
        bgl.glEnd()

        circleShader.disable()

        bgl.glDepthFunc(bgl.GL_LEQUAL)
        bgl.glDepthRange(0.0, 1.0)
        bgl.glDepthMask(bgl.GL_TRUE) 

def draw_callback_px(self, context):
    print("mouse points", len(self.mouse_path))

    font_id = 0  # XXX, need to find out how best to get this.

    # draw some text
    blf.position(font_id, 15, 30, 0)
    blf.size(font_id, 20, 72)
    blf.draw(font_id, "Hello Word " + str(len(self.mouse_path)))

    # 50% alpha, 2 pixel width line
    bgl.glEnable(bgl.GL_BLEND)
    bgl.glColor4f(0.0, 0.0, 0.0, 0.5)
    bgl.glLineWidth(2)

    bgl.glBegin(bgl.GL_LINE_STRIP)
    for x, y in self.mouse_path:
        bgl.glVertex2i(x, y)

    bgl.glEnd()

    # restore opengl defaults
    bgl.glLineWidth(1)
    bgl.glDisable(bgl.GL_BLEND)
    bgl.glColor4f(0.0, 0.0, 0.0, 1.0) 

def draw_arc12(x, y, radius, start_angle, end_angle, subdivide):  # いずれ削除
    # 十二時から時計回りに描画
    v = Vector([0, 1, 0])
    e = Euler((0, 0, -start_angle))
    m = e.to_matrix()
    v = v * m
    if end_angle >= start_angle:
        a = (end_angle - start_angle) / (subdivide + 1)
    else:
        a = (end_angle + math.pi * 2 - start_angle) / (subdivide + 1)
    e = Euler((0, 0, -a))
    m = e.to_matrix()

    bgl.glBegin(bgl.GL_LINE_STRIP)
    for i in range(subdivide + 2):
        v1 = v * radius
        bgl.glVertex2f(x + v1[0], y + v1[1])
        v = v * m
    bgl.glEnd() 

def draw_quad_fan(x, y, inner_radius, outer_radius,
                  start_angle, end_angle, edgenum=16):
    # 三時から反時計回りに描画
    start = normalize_angle(start_angle)
    end = normalize_angle(end_angle)
    if end < start:
        end += math.pi * 2
    d = (end - start) / edgenum
    a = start
    bgl.glBegin(bgl.GL_QUAD_STRIP)
    for i in range(edgenum + 1):
        bgl.glVertex2f(x + inner_radius * math.cos(a),
                       y + inner_radius * math.sin(a))
        bgl.glVertex2f(x + outer_radius * math.cos(a),
                       y + outer_radius * math.sin(a))
        a += d
    bgl.glEnd() 

def mi_draw_2d_point(point_x, point_y, p_size=4, p_col=(1.0,1.0,1.0,1.0)):
    bgl.glEnable(bgl.GL_BLEND)
    #bgl.glColor4f(1.0, 1.0, 1.0, 0.5)
    #bgl.glLineWidth(2)

    bgl.glPointSize(p_size)
#    bgl.glBegin(bgl.GL_LINE_LOOP)
    bgl.glBegin(bgl.GL_POINTS)
 #   bgl.glBegin(bgl.GL_POLYGON)
    bgl.glColor4f(p_col[0], p_col[1], p_col[2], p_col[3])
    bgl.glVertex2f(point_x, point_y)
    bgl.glEnd()

    # restore opengl defaults
    bgl.glLineWidth(1)
    bgl.glDisable(bgl.GL_BLEND)
    bgl.glColor4f(0.0, 0.0, 0.0, 1.0)


# TODO MOVE TO UTILITIES 

def mi_curve_draw_3d_polyline(points, p_size, p_col, x_ray):
    bgl.glEnable(bgl.GL_BLEND)
    bgl.glLineWidth(1)

    if x_ray is True:
        bgl.glDisable(bgl.GL_DEPTH_TEST)

    bgl.glPointSize(p_size)
#    bgl.glBegin(bgl.GL_LINE_LOOP)
    bgl.glBegin(bgl.GL_LINE_STRIP)
    bgl.glColor4f(p_col[0], p_col[1], p_col[2], p_col[3])
 #   bgl.glBegin(bgl.GL_POLYGON)

    for point in points:
        bgl.glVertex3f(point[0], point[1], point[2])

    if x_ray is True:
        bgl.glEnable(bgl.GL_DEPTH_TEST)

    bgl.glEnd()

    # restore opengl defaults
    bgl.glLineWidth(1)
    bgl.glDisable(bgl.GL_BLEND)
    bgl.glColor4f(0.0, 0.0, 0.0, 1.0) 

def draw_2d_point(point_x, point_y, p_size=4, p_col=(1.0,1.0,1.0,1.0)):
    bgl.glEnable(bgl.GL_BLEND)
    #bgl.glColor4f(1.0, 1.0, 1.0, 0.5)
    #bgl.glLineWidth(2)

    bgl.glPointSize(p_size)
#    bgl.glBegin(bgl.GL_LINE_LOOP)
    bgl.glBegin(bgl.GL_POINTS)
 #   bgl.glBegin(bgl.GL_POLYGON)
    bgl.glColor4f(p_col[0], p_col[1], p_col[2], p_col[3])
    bgl.glVertex2f(point_x, point_y)
    bgl.glEnd()

    # restore opengl defaults
    bgl.glLineWidth(1)
    bgl.glDisable(bgl.GL_BLEND)
    bgl.glColor4f(0.0, 0.0, 0.0, 1.0) 

def _draw(self):
        self.buffer_image()
        if not self.buffered: return

        cx,cy = (self.pos.x + self.size.x / 2, self.pos.y - self.size.y / 2)
        iw,ih = self.get_image_width(),self.get_image_height()
        il,it = cx-iw/2, cy+ih/2

        bgl.glColor4f(1,1,1,1)
        bgl.glEnable(bgl.GL_BLEND)
        bgl.glEnable(bgl.GL_TEXTURE_2D)
        bgl.glBindTexture(bgl.GL_TEXTURE_2D, self.texture_id)
        bgl.glBegin(bgl.GL_QUADS)
        bgl.glTexCoord2f(0,0);  bgl.glVertex2f(il,it)
        bgl.glTexCoord2f(0,1);  bgl.glVertex2f(il,it-ih)
        bgl.glTexCoord2f(1,1);  bgl.glVertex2f(il+iw,it-ih)
        bgl.glTexCoord2f(1,0);  bgl.glVertex2f(il+iw,it)
        bgl.glEnd()
        bgl.glBindTexture(bgl.GL_TEXTURE_2D, 0) 

def draw_callback_px(self, context):
    """From blender's operator_modal_draw.py modal operator template"""
    if self.do_draw:
        bgl.glEnable(bgl.GL_BLEND)
        bgl.glEnable(bgl.GL_LINE_STIPPLE)
        bgl.glColor4f(0.0, 0.0, 0.0, 1.0)
        bgl.glLineWidth(1)

        bgl.glBegin(bgl.GL_LINE_STRIP)
        bgl.glVertex2i(int(self.draw_start.x), int(self.draw_start.y))
        bgl.glVertex2i(int(self.draw_end.x), int(self.draw_end.y))

        bgl.glEnd()

        # restore opengl defaults
        bgl.glLineWidth(1)
        bgl.glDisable(bgl.GL_BLEND)
        bgl.glDisable(bgl.GL_LINE_STIPPLE)
        bgl.glColor4f(0.0, 0.0, 0.0, 1.0) 

def draw_darken(self):
        bgl.glPushAttrib(bgl.GL_ALL_ATTRIB_BITS)
        bgl.glMatrixMode(bgl.GL_PROJECTION)
        bgl.glPushMatrix()
        bgl.glLoadIdentity()
        bgl.glColor4f(0,0,0,0.25)    # TODO: use window background color??
        bgl.glEnable(bgl.GL_BLEND)
        bgl.glDisable(bgl.GL_DEPTH_TEST)
        bgl.glBegin(bgl.GL_QUADS)   # TODO: not use immediate mode
        bgl.glVertex2f(-1, -1)
        bgl.glVertex2f( 1, -1)
        bgl.glVertex2f( 1,  1)
        bgl.glVertex2f(-1,  1)
        bgl.glEnd()
        bgl.glPopMatrix()
        bgl.glPopAttrib() 

def draw_outline_or_region(mode, points, color):
    '''  
    draws and outline or region
    mode: either bgl.GL_POLYGON or bgl.GL_LINE_LOOP
    color: will need to be set beforehand using theme colors. eg
    bgl.glColor4f(self.ri, self.gi, self.bi, self.ai)
    return: None
    '''
    
    bgl.glColor4f(color[0],color[1],color[2],color[3])
    if mode == 'GL_LINE_LOOP':
        bgl.glBegin(bgl.GL_LINE_LOOP)
    else:
        bgl.glEnable(bgl.GL_BLEND)
        bgl.glBegin(bgl.GL_POLYGON)
    
    # start with corner right-bottom
    for i in range(0,len(points)):
        bgl.glVertex2f(points[i][0],points[i][1])
    
    bgl.glEnd() 

def __draw_ctrl_point(self, context, pos):
        """
        Draw control point
        """
        cp_size = context.scene.muv_uvbb_cp_size
        offset = cp_size / 2
        verts = [
            [pos.x - offset, pos.y - offset],
            [pos.x - offset, pos.y + offset],
            [pos.x + offset, pos.y + offset],
            [pos.x + offset, pos.y - offset]
            ]
        bgl.glEnable(bgl.GL_BLEND)
        bgl.glBegin(bgl.GL_QUADS)
        bgl.glColor4f(1.0, 1.0, 1.0, 1.0)
        for (x, y) in verts:
            bgl.glVertex2f(x, y)
        bgl.glEnd() 

def draw_arrow_2d(p0, n, L, arrow_len, arrow_width):
    p1 = p0 + n * L
    t = Vector((-n[1], n[0]))
    pA = p1 - n * arrow_len + t * arrow_width
    pB = p1 - n * arrow_len - t * arrow_width

    bgl.glBegin(bgl.GL_LINES)

    bgl.glVertex2f(p0[0], p0[1])
    bgl.glVertex2f(p1[0], p1[1])

    bgl.glVertex2f(p1[0], p1[1])
    bgl.glVertex2f(pA[0], pA[1])

    bgl.glVertex2f(p1[0], p1[1])
    bgl.glVertex2f(pB[0], pB[1])

    bgl.glEnd()

# Store/restore OpenGL settings and working with
# projection matrices -- inspired by space_view3d_panel_measure
# of Buerbaum Martin (Pontiac).

# OpenGl helper functions/data 

def draw_arrow(p0, x, y, z, n_scl=0.2, ort_scl=0.035):
    p1 = p0 + z

    bgl.glBegin(bgl.GL_LINE_STRIP)
    bgl.glVertex3f(p0[0], p0[1], p0[2])
    bgl.glVertex3f(p1[0], p1[1], p1[2])
    bgl.glEnd()

    p2 = p1 - z * n_scl
    bgl.glBegin(bgl.GL_TRIANGLE_FAN)
    bgl.glVertex3f(p1[0], p1[1], p1[2])
    p3 = p2 + (x + y) * ort_scl
    bgl.glVertex3f(p3[0], p3[1], p3[2])
    p3 = p2 + (-x + y) * ort_scl
    bgl.glVertex3f(p3[0], p3[1], p3[2])
    p3 = p2 + (-x - y) * ort_scl
    bgl.glVertex3f(p3[0], p3[1], p3[2])
    p3 = p2 + (x - y) * ort_scl
    bgl.glVertex3f(p3[0], p3[1], p3[2])
    p3 = p2 + (x + y) * ort_scl
    bgl.glVertex3f(p3[0], p3[1], p3[2])
    bgl.glEnd() 

def mi_draw_2d_point(point_x, point_y, p_size=4, p_col=(1.0,1.0,1.0,1.0)):
    bgl.glEnable(bgl.GL_BLEND)
    #bgl.glColor4f(1.0, 1.0, 1.0, 0.5)
    #bgl.glLineWidth(2)

    bgl.glPointSize(p_size)
#    bgl.glBegin(bgl.GL_LINE_LOOP)
    bgl.glBegin(bgl.GL_POINTS)
 #   bgl.glBegin(bgl.GL_POLYGON)
    bgl.glColor4f(p_col[0], p_col[1], p_col[2], p_col[3])
    bgl.glVertex2f(point_x, point_y)
    bgl.glEnd()

    # restore opengl defaults
    bgl.glLineWidth(1)
    bgl.glDisable(bgl.GL_BLEND)
    bgl.glColor4f(0.0, 0.0, 0.0, 1.0)


# TODO MOVE TO UTILITIES 

def draw_rect(x, y, w, h, margin=0, outline=False):
    if w < 0:
        x += w
        w = abs(w)

    if h < 0:
        y += h
        h = abs(h)

    x = int(x)
    y = int(y)
    w = int(w)
    h = int(h)
    margin = int(margin)

    if outline:
        bgl.glBegin(bgl.GL_LINE_LOOP)
    else:
        bgl.glBegin(bgl.GL_TRIANGLE_FAN)
    bgl.glVertex2i(x - margin, y - margin)
    bgl.glVertex2i(x + w + margin, y - margin)
    bgl.glVertex2i(x + w + margin, y + h + margin)
    bgl.glVertex2i(x - margin, y + h + margin)
    bgl.glEnd() 

def draw_offset(self, context):
        bgl.glShadeModel(bgl.GL_SMOOTH)

        tfm_operator = CursorDynamicSettings.active_transform_operator

        bgl.glBegin(bgl.GL_LINE_STRIP)

        if tfm_operator:
            p = tfm_operator.particles[0]. \
                get_initial_matrix().to_translation()
        else:
            p = self.get_pos(self.last_id)
        bgl.glColor4f(1.0, 0.75, 0.5, 1.0)
        bgl.glVertex3f(p[0], p[1], p[2])

        p = get_cursor_location(v3d=context.space_data)
        bgl.glColor4f(1.0, 1.0, 0.25, 1.0)
        bgl.glVertex3f(p[0], p[1], p[2])

        bgl.glEnd()

# ===== BOOKMARK ===== # 

def draw2d_polyline(points, color, thickness, stipple=False):
    if stipple:
        bgl.glLineStipple(4, 0x5555)  #play with this later
        bgl.glEnable(bgl.GL_LINE_STIPPLE)
    bgl.glEnable(bgl.GL_BLEND)
    bgl.glColor4f(*color)
    bgl.glLineWidth(thickness)
    bgl.glBegin(bgl.GL_LINE_STRIP)
    for coord in points: bgl.glVertex2f(*coord)
    bgl.glEnd()
    bgl.glLineWidth(1)
    if stipple:
        bgl.glDisable(bgl.GL_LINE_STIPPLE)
        bgl.glEnable(bgl.GL_BLEND)  # back to uninterupted lines 

def draw_postpixel(self):
        if not self.visible: return

        self.drawing.set_font_size(12)

        pr = profiler.start('UI_Window: updating position')
        self.update_pos()
        pr.done()

        l,t = self.pos
        w,h = self.size

        bgl.glEnable(bgl.GL_BLEND)

        # draw background
        bgl.glColor4f(*self.bgcolor)
        bgl.glBegin(bgl.GL_QUADS)
        bgl.glVertex2f(l,t)
        bgl.glVertex2f(l,t-h)
        bgl.glVertex2f(l+w,t-h)
        bgl.glVertex2f(l+w,t)
        bgl.glEnd()

        self.drawing.line_width(1.0)
        bgl.glColor4f(0,0,0,0.5)
        bgl.glBegin(bgl.GL_LINE_STRIP)
        bgl.glVertex2f(l,t)
        bgl.glVertex2f(l,t-h)
        bgl.glVertex2f(l+w,t-h)
        bgl.glVertex2f(l+w,t)
        bgl.glVertex2f(l,t)
        bgl.glEnd()

        pr = profiler.start('UI_Window: drawing contents')
        self.draw(l, t, w, h)
        pr.done() 

def _draw(self):
        r,g,b,a = (0,0,0,0.1) if not (self.downed or self.captured) else (0.8,0.8,0.8,0.5)
        l,t = self.pos
        w,h = self.size
        bgl.glEnable(bgl.GL_BLEND)
        self.drawing.line_width(1)

        if self.hovering:
            bgcolor = self.hovercolor or self.bgcolor
        else:
            bgcolor = self.bgcolor

        if bgcolor:
            bgl.glColor4f(*bgcolor)
            bgl.glBegin(bgl.GL_QUADS)
            bgl.glVertex2f(l,t)
            bgl.glVertex2f(l,t-h)
            bgl.glVertex2f(l+w,t-h)
            bgl.glVertex2f(l+w,t)
            bgl.glEnd()

        bgl.glColor4f(r,g,b,a)
        bgl.glBegin(bgl.GL_LINE_STRIP)
        bgl.glVertex2f(l,t)
        bgl.glVertex2f(l,t-h)
        bgl.glVertex2f(l+w,t-h)
        bgl.glVertex2f(l+w,t)
        bgl.glVertex2f(l,t)
        bgl.glEnd()
        super()._draw() 

def _draw(self):
        r,g,b,a = (0,0,0,0.1) if not (self.downed or self.captured) else (0.8,0.8,0.8,0.5)
        l,t = self.pos
        w,h = self.size
        bgl.glEnable(bgl.GL_BLEND)
        self.drawing.line_width(1)

        if self.hovering:
            bgcolor = self.hovercolor or self.bgcolor
        else:
            bgcolor = self.bgcolor

        if bgcolor:
            bgl.glColor4f(*bgcolor)
            bgl.glBegin(bgl.GL_QUADS)
            bgl.glVertex2f(l,t)
            bgl.glVertex2f(l,t-h)
            bgl.glVertex2f(l+w,t-h)
            bgl.glVertex2f(l+w,t)
            bgl.glEnd()

        bgl.glColor4f(r,g,b,a)
        bgl.glBegin(bgl.GL_LINE_STRIP)
        bgl.glVertex2f(l,t)
        bgl.glVertex2f(l,t-h)
        bgl.glVertex2f(l+w,t-h)
        bgl.glVertex2f(l+w,t)
        bgl.glVertex2f(l,t)
        bgl.glEnd()
        super()._draw() 

def _draw(self):
        size_prev = self.drawing.set_font_size(self.fontsize)
        line_height = self.drawing.get_line_height()

        l,t = self.pos
        w,h = self.size
        twidth = self.drawing.get_text_width
        theight = self.drawing.get_text_height

        if self.bgcolor:
            bgl.glEnable(bgl.GL_BLEND)
            bgl.glColor4f(*self.bgcolor)
            bgl.glBegin(bgl.GL_QUADS)
            bgl.glVertex2f(l,t)
            bgl.glVertex2f(l,t-h)
            bgl.glVertex2f(l+w,t-h)
            bgl.glVertex2f(l+w,t)
            bgl.glEnd()

        y = t
        for line in self.wrapped_lines:
            lheight = theight(line)
            if self.shadowcolor:
                self.drawing.text_draw2D(line, Point2D((l+2, y-2)), self.shadowcolor)
            self.drawing.text_draw2D(line, Point2D((l, y)), self.color)
            y -= self.drawing.get_line_height(line) #line_height #lheight

        self.drawing.set_font_size(size_prev) 

def draw_callback_px_2d(self, context):

    # 50% alpha, 2 pixel width line
    bgl.glEnable(bgl.GL_BLEND)
    bgl.glColor4f(1.0, 1.0, 1.0, 0.5)
    bgl.glLineWidth(2)

   # bgl.glBegin(bgl.GL_LINE_STRIP)
   # bgl.glVertex3f(*ob.matrix_world.translation)
   # bgl.glVertex3f(*context.scene.cursor_location)
   # bgl.glEnd()

    #bgl.glBegin(bgl.GL_POLYGON)
    ##bgl.glColor4f(0.0, 0.0, 0.0, 0.5)
    #bgl.glVertex3f(0.0, 0.0, 0.0)
    #bgl.glVertex3f(0.0, 1.0, 0.0)
    #bgl.glVertex3f(1.0, 1.0, 0.0)
    #bgl.glVertex3f(1.0, 0.0, 0.0)
    #bgl.glEnd()

    #bgl.glEnable(bgl.GL_BLEND)
    #bgl.glLineWidth(1.5)
    bgl.glPointSize(4)
#    bgl.glBegin(bgl.GL_LINE_LOOP)
    bgl.glBegin(bgl.GL_POINTS)
 #   bgl.glBegin(bgl.GL_POLYGON)
    bgl.glColor4f(0.5,1.1,1.0,0.5)
    bgl.glVertex2f(10, 20)
    bgl.glVertex2f(50,60)
    bgl.glVertex2f(700,80)
    bgl.glVertex2f(2,180)
    bgl.glEnd()

    # restore opengl defaults
    bgl.glLineWidth(1)
    bgl.glDisable(bgl.GL_BLEND)
    bgl.glColor4f(0.0, 0.0, 0.0, 1.0)