Python blf.size() Examples

def draw_callback_text(self):
        obj = bpy.context.active_object
        ### draw text for edge length detection
        if self.shift and self.point_type == "EDGE":
            p1 = obj.matrix_world * self.verts_edges_data[0]
            p2 = obj.matrix_world * self.verts_edges_data[1]
            length = (p1-p2).magnitude

            font_id = 0
            line = str(round(length,2))
            bgl.glEnable(bgl.GL_BLEND)
            bgl.glColor4f(1,1,1,1)

            blf.position(font_id, self.mouse_2d_x-15, self.mouse_2d_y+30, 0)
            blf.size(font_id, 20, 72)
            blf.draw(font_id, line)

        if self.mode == "EDIT_MESH":
            draw_edit_mode(self,bpy.context,color=[1.0, 0.39, 0.41, 1.0],text="Edit Mesh Mode",offset=-20)
        elif self.mode == "DRAW_BONE_SHAPE":
            draw_edit_mode(self,bpy.context,color=[1.0, 0.39, 0.41, 1.0],text="Draw Bone Shape",offset=-20) 

def draw_text(text, position, color=(1.0, 1.0, 1.0, 1.0), size=14, dpi=150, font_id=0):
    """

    Args:
      text: 
      position: 
      color: (Default value = (1.0)
      1.0: 
      1.0): 
      size: (Default value = 14)
      dpi: (Default value = 150)
      font_id: (Default value = 0)

    Returns:

    """
    bgl.glColor4f(*color)
    blf.position(font_id, *position, 0.25)
    blf.size(font_id, size, dpi)
    blf.draw(font_id, text) 

def onscreen_warning(self, x, y):
        gamma = self.gamma_correction

        fontid = 1
        blf.size(fontid, self.prefs.view_font_size_report, 72)
        blf.color(fontid, *gamma((1.0, 0.3, 0.3, 1.0)))

        _, font_h = blf.dimensions(fontid, "Row Height")
        font_row_height = font_h * 2
        y += font_h

        for row in self.warn:
            y -= font_row_height

            blf.position(fontid, x, y, 0.0)
            blf.draw(fontid, row)

        return y 

def MatrixDecompose(m, res_size=None):
    size = len(m)
    axes = m.col # m.row
    if res_size is None:
        res_size = size

    if res_size == 2:
        return (axes[0].to_2d(), axes[1].to_2d())
    else:
        x = axes[0].to_3d()
        y = axes[1].to_3d()
        z = (axes[2].to_3d() if size > 2 else Vector())
        if res_size == 3:
            return (x, y, z)

        t = (m.translation.to_3d() if size == 4 else Vector())
        if res_size == 4:
            return (x, y, z, t) 

def draw_text_2d(self, context):

    cur_stretch_settings = context.scene.mi_cur_stretch_settings
    rh = context.region.height
    rw = context.region.width

    font_id = 0
    font_size = 30

    #Set font color
    bgl.glEnable(bgl.GL_BLEND)
    #bgl.glColor(1, 0.75, 0.1, 1)
    blf.color(0, 1, 0.75, 0.1, 1)
    bgl.glLineWidth(2)

    #Draw text
    blf.position(font_id, rw - 400, 210 - font_size, 0)
    blf.size(font_id, font_size, 72)
    blf.draw(font_id, str(cur_stretch_settings.points_number))

    # restore opengl defaults
    bgl.glLineWidth(1)
    blf.color(0, 0.0, 0.0, 0.0, 1.0)
    bgl.glDisable(bgl.GL_BLEND)
    #bgl.glColor(0, 0.0, 0.0, 0.0, 1.0) 

def draw(self, context, render=False):

        # print("draw_text %s %s" % (self.text, type(self).__name__))
        self.render = render
        p = self.position_2d_from_coord(context, self.pts[0], render)
        # dirty fast assignment
        dpi, font_id = context.user_preferences.system.dpi, 0
        bgl.glColor4f(*self.colour)
        if self.angle != 0:
            blf.enable(font_id, blf.ROTATION)
            blf.rotation(font_id, self.angle)
        blf.size(font_id, self.font_size, dpi)
        blf.position(font_id, p.x, p.y, 0)
        blf.draw(font_id, self.text)
        if self.angle != 0:
            blf.disable(font_id, blf.ROTATION) 

def _draw_callback_px(self, context):

    try:
        print("SELF", self)
    except:
        print("red err?")

    r_width = context.region.width
    r_height = context.region.height
    font_id = 0  # TODO: need to find out how best to get font_id

    blf.size(font_id, 11, 72)
    text_size = blf.dimensions(0, self.view_name)

    text_x = r_width - text_size[0] - 10
    text_y = r_height - text_size[1] - 8
    blf.position(font_id, text_x, text_y, 0)
    blf.draw(font_id, self.view_name) 

def DrawCenterText(text, xt, yt, Size, Color, self):
    font_id = 0
    # Decalage Ombre
    Sshadow_x = 2
    Sshadow_y = -2

    blf.size(font_id, Size, 72)
    blf.position(font_id, xt + Sshadow_x - blf.dimensions(font_id, text)[0] / 2, yt + Sshadow_y, 0)
    bgl.glColor4f(0.0, 0.0, 0.0, 1.0)

    blf.draw(font_id, text)
    blf.position(font_id, xt - blf.dimensions(font_id, text)[0] / 2, yt, 0)
    if Color is not None:
        mColor = mathutils.Color((Color[0], Color[1], Color[2]))
        bgl.glColor4f(mColor.r, mColor.g, mColor.b, 1.0)
    else:
        bgl.glColor4f(1.0, 1.0, 1.0, 1.0)
    blf.draw(font_id, text)


# Draw text (Left position) 

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 DrawLeftText(text, xt, yt, Size, Color, self):
    font_id = 0
    # Decalage Ombre
    Sshadow_x = 2
    Sshadow_y = -2

    blf.size(font_id, Size, 72)
    blf.position(font_id, xt + Sshadow_x, yt + Sshadow_y, 0)
    bgl.glColor4f(0.0, 0.0, 0.0, 1.0)
    blf.draw(font_id, text)
    blf.position(font_id, xt, yt, 0)
    if Color is not None:
        mColor = mathutils.Color((Color[0], Color[1], Color[2]))
        bgl.glColor4f(mColor.r, mColor.g, mColor.b, 1.0)
    else:
        bgl.glColor4f(1.0, 1.0, 1.0, 1.0)
    blf.draw(font_id, text)


# Draw text (Right position) 

def DrawRightText(text, xt, yt, Size, Color, self):
    font_id = 0
    # Decalage Ombre
    Sshadow_x = 2
    Sshadow_y = -2

    blf.size(font_id, Size, 72)
    blf.position(font_id, xt + Sshadow_x - blf.dimensions(font_id, text)[0], yt + Sshadow_y, 0)
    bgl.glColor4f(0.0, 0.0, 0.0, 1.0)
    blf.draw(font_id, text)
    blf.position(font_id, xt - blf.dimensions(font_id, text)[0], yt, 0)
    if Color is not None:
        mColor = mathutils.Color((Color[0], Color[1], Color[2]))
        bgl.glColor4f(mColor.r, mColor.g, mColor.b, 1.0)
    else:
        bgl.glColor4f(1.0, 1.0, 1.0, 1.0)
    blf.draw(font_id, text)


# Opengl draws 

def create_cube_mesh(name,size):
    
    verts = [(0.0, 0.0, 0.0),
             (0.0, size[1], 0.0),
             (size[0], size[1], 0.0),
             (size[0], 0.0, 0.0),
             (0.0, 0.0, size[2]),
             (0.0, size[1], size[2]),
             (size[0], size[1], size[2]),
             (size[0], 0.0, size[2]),
             ]

    faces = [(0, 1, 2, 3),
             (4, 7, 6, 5),
             (0, 4, 5, 1),
             (1, 5, 6, 2),
             (2, 6, 7, 3),
             (4, 0, 3, 7),
            ]
    
    return create_object_from_verts_and_faces(verts,faces,name) 

def draw_extension_lines(v1, v2, size=20):
    rad_a = math.radians(90)
    rad_b = math.radians(270)

    v = interpolate3d((v1[0], v1[1], 0.0), (v2[0], v2[1], 0.0), size)
    v1i = (v[0] - v1[0], v[1] - v1[1])

    v = interpolate3d((v2[0], v2[1], 0.0), (v1[0], v1[1], 0.0), size)
    v2i = (v[0] - v2[0], v[1] - v2[1])

    v1a = (int(v1i[0] * math.cos(rad_a) - v1i[1] * math.sin(rad_a) + v1[0]),
           int(v1i[1] * math.cos(rad_a) + v1i[0] * math.sin(rad_a)) + v1[1])
    v1b = (int(v1i[0] * math.cos(rad_b) - v1i[1] * math.sin(rad_b) + v1[0]),
           int(v1i[1] * math.cos(rad_b) + v1i[0] * math.sin(rad_b) + v1[1]))

    v2a = (int(v2i[0] * math.cos(rad_a) - v2i[1] * math.sin(rad_a) + v2[0]),
           int(v2i[1] * math.cos(rad_a) + v2i[0] * math.sin(rad_a)) + v2[1])
    v2b = (int(v2i[0] * math.cos(rad_b) - v2i[1] * math.sin(rad_b) + v2[0]),
           int(v2i[1] * math.cos(rad_b) + v2i[0] * math.sin(rad_b) + v2[1]))
    
    draw_line(v1, v1a)
    draw_line(v1, v1b)
    
    draw_line(v2, v2a)
    draw_line(v2, v2b) 

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 set_pos(self, context, pos_3d, direction, normal=Vector((0, 0, 1))):
        self.pos_3d = pos_3d
        self.pos_2d = self.position_2d_from_coord(context, self.sensor_center)
        o = self.pos_3d
        w = self.size
        s = 0.25 * w
        x = direction.normalized()
        y = x.cross(normal)
        xs = x * s
        xw = x * w
        ys = y * s
        yw = y * w
        p0 = o - xw + ys
        p1 = o + xw + ys
        p2 = o + xw - ys
        p3 = o - xw - ys
        p4 = o - xs + yw
        p5 = o + xs + yw
        p6 = o + xs - yw
        p7 = o - xs - yw
        self.branch_0.set_pos([p0, p1, p2, p3])
        self.branch_1.set_pos([p4, p5, p6, p7]) 

def draw_callback_2d(self, op, context):

        # Draw text for add object mode
        header = "- Add Object Mode (Type: " + context.scene.add_object_type + ") -"
        text = "Ctrl + Left Click = Add | Esc = Exit"

        blf.color(1, 1, 1, 1, 1)
        blf.size(0, 20, 72)
        blf.size(1, 16, 72)

        region = context.region
        xt = int(region.width / 2.0)

        blf.position(0, xt - blf.dimensions(0, header)[0] / 2, 50 , 0)
        blf.draw(0, header)

        blf.position(1, xt - blf.dimensions(1, text)[0] / 2, 20 , 0)
        blf.draw(1, text) 

def size(self, context):

        system = context.user_preferences.system
        w = context.region.width
        h = context.region.height
        y_min = self.margin
        y_max = h - self.margin
        x_min = self.margin
        x_max = w - self.margin
        if (system.use_region_overlap and
                system.window_draw_method in {'TRIPLE_BUFFER', 'AUTOMATIC'}):
            area = context.area

            for r in area.regions:
                if r.type == 'TOOLS':
                    x_min += r.width
                elif r.type == 'UI':
                    x_max -= r.width
        return x_min, x_max, y_min, y_max 

def draw_callback_px(self, context):

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

    # draw some text
    y = context.region.height
    dims = blf.dimensions(0, 'A')

    blf.position(font_id, 10, y - 20 - dims[1], 0)
    blf.size(font_id, 20, 72)

    if context.area.x == self.area_align.x:
        blf.draw(font_id, "Align: "+ self.align_msg)
        points = [self.obj_align.matrix_world * p for p in self.align_points]
        color = (1,0,0,1)
    else:
        blf.draw(font_id, "Base: " + self.base_msg)
        points = [self.obj_align.matrix_world * p for p in self.base_points]
        color = (0,1,0,1)

    draw_3d_points_revised(context, points, color, 4)

    for i, vec in enumerate(points):
        ind = str(i)
        draw_3d_text(context, font_id, ind, vec) 

def __init__(self, sensor_size, size, draggable=True, selectable=False):
        GlHandle.__init__(self, sensor_size, size, draggable, selectable)
        self.branch_0 = GlPolygon((1, 1, 1, 1), d=3)
        self.branch_1 = GlPolygon((1, 1, 1, 1), d=3) 

def draw(text, xyz=None, fontsize=None, dpi=None, fontid=None):
        fontid = FontManager.load(fontid)
        if xyz: blf.position(fontid, *xyz)
        if fontsize: FontManager.size(fontsize, dpi=dpi, fontid=fontid)
        return blf.draw(fontid, text) 

def pts(self):
        n = self.up_axis
        c = self.c_axis
        # does move sensitive area so disable for tri handle
        # may implement sensor_center property to fix this
        # if self.selected or self.hover or self.active:
        scale = 1
        # else:
        #    scale = 0.5
        x = n * self.size * 4 * scale
        y = c * self.size * scale
        return [self.pos_3d - x + y, self.pos_3d - x - y, self.pos_3d] 

def __init__(self, sensor_size, size, draggable=False, selectable=False):
        GlHandle.__init__(self, sensor_size, size, draggable, selectable) 

def draw_text(self, area_height):
        blf.size(0, self._text_size, 72)
        size = blf.dimensions(0, self._text)

        textpos_y = area_height - self._textpos[1] - (self.height + size[1]) / 2.0
        blf.position(0, self._textpos[0] + (self.width - size[0]) / 2.0, textpos_y + 1, 0)

        r, g, b, a = self._text_color
        blf.color(0, r, g, b, a)

        blf.draw(0, self._text) 

def onscreen_gem_table(self, x, y, color=(0.95, 0.95, 0.95, 1.0), is_viewport=True):
        gamma = self.gamma_correction if is_viewport else lambda x: x
        color = gamma(color)

        fontid = 1
        blf.size(fontid, self.prefs.view_font_size_report, 72)
        blf.color(fontid, *color)

        _, font_h = blf.dimensions(fontid, "Row Height")
        font_baseline = font_h * 0.4
        font_row_height = font_h * 2
        box_size = font_h * 1.5
        y += font_baseline

        for row, color in self.gems_fmt:
            y -= font_row_height

            shader.bind()
            shader.uniform_float("color", color)
            batch_font = batch_for_shader(shader, "TRI_FAN", {"pos": self.rect_coords(x, y, box_size, box_size)})
            batch_font.draw(shader)

            blf.position(fontid, x + font_row_height, y + font_baseline, 0.0)
            blf.draw(fontid, row)

        return y 

def drawText2D(color, text):
    font_id = 0  # XXX, need to find out how best to get this.
    # draw some text
    bgl.glColor4f(*color)
    blf.position(font_id, 20, 70, 0)
    blf.size(font_id, 20, 72)
    blf.draw(font_id, text) 

def __init__(self, loc, text, size=15):
        self.font_size = size
        self.font_color = (.25, .25, .25, 1)
        self.bg_color = (.5, .5, .5, 1)
        self.bg_color_selected = (.7, .7, .7, 1)
        self.font_id = len(Button.buttons)
        self.text = text
        blf.color(self.font_id, *self.font_color)
        blf.position(self.font_id, *loc, 0)
        blf.size(self.font_id, self.font_size, 72)
        self.dimensions = blf.dimensions(self.font_id, text)
        self.function = lambda args : None

        super().__init__(loc, self.dimensions[0]+5, self.dimensions[1]+5)
        Button.buttons.append(self) 

def draw(self):
        area_height = self.get_area_height()

        blf.size(0, self._text_size, 72)
        size = blf.dimensions(0, self._text)
    
        textpos_y = area_height - self.y_screen - self.height
        blf.position(0, self.x_screen, textpos_y, 0)

        r, g, b, a = self._text_color

        blf.color(0, r, g, b, a)
            
        blf.draw(0, self._text) 

def draw_text(self, area_height):
        blf.size(0, self._text_size, 72)
        size = blf.dimensions(0, self._text)

        textpos_y = area_height - \
            self._textpos[1] - (self.height + size[1]) / 2.0
        blf.position(
            0, self._textpos[0] + (self.width - size[0]) / 2.0, textpos_y + 1, 0)

        r, g, b, a = self._text_color
        blf.color(0, r, g, b, a)

        blf.draw(0, self._text) 

def write():
    """write on screen"""
    width = render.getWindowWidth()
    height = render.getWindowHeight()

    # OpenGL setup
    bgl.glMatrixMode(bgl.GL_PROJECTION)
    bgl.glLoadIdentity()
    bgl.gluOrtho2D(0, width, 0, height)
    #bgl.glColor(1,1,1,1)
    bgl.glMatrixMode(bgl.GL_MODELVIEW)
    bgl.glLoadIdentity()

    # BLF drawing routine
    font_id = logic.font_id
    RED = (1, 0, 0, 1)
    pcol = ("Blue ", RED)
    #blf.color(font_id, 1, 1, 0, 0.5)
    blf.blur(font_id,500)
    blf.rotation(font_id, 90)
    blf.position(font_id, (width * 0.5), (height * 0.5), 0.5)
    blf.size(font_id, 20, 100)
    blf.draw(font_id, "Hello World1")
    blf.size(font_id, 50, 72)
    blf.position(font_id, (width * 0.0), (height * 0.5), 0.5)
    blf.draw(font_id, "Hello World2") 

def size(size, dpi=None, fontid=None):
        if not dpi: dpi = FontManager.get_dpi()
        return blf.size(FontManager.load(fontid), size, dpi)