Is possible the blf functions working over the text editor?

Coding Python Support
1

I edited the template “operator_modal_draw.py” to run on the text editor.
Like this:


import bpy
import bgl
import blf

def draw_callback_px(self, context):
    bgl.glDepthRange(0,0)
    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, 100.00001)
    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.glDepthRange(0,1)
    bgl.glLineWidth(1)
    bgl.glDisable(bgl.GL_BLEND)
    bgl.glColor4f(0.0, 0.0, 0.0, 1.0)

class ModalDrawOperator(bpy.types.Operator):
    """Draw a line with the mouse"""
    bl_idname = "text.modal_operator"
    bl_label = "Simple Modal Text Editor Operator"

    def modal(self, context, event):
        context.area.tag_redraw()

        if event.type == 'MOUSEMOVE':
            self.mouse_path.append((event.mouse_region_x, event.mouse_region_y))

        elif event.type == 'LEFTMOUSE':
            bpy.types.SpaceTextEditor.draw_handler_remove(self._handle, 'WINDOW')
            return {'FINISHED'}

        elif event.type in {'RIGHTMOUSE', 'ESC'}:
            bpy.types.SpaceTextEditor.draw_handler_remove(self._handle, 'WINDOW')
            return {'CANCELLED'}

        return {'RUNNING_MODAL'}

    def invoke(self, context, event):
        # the arguments we pass the the callback
        args = (self, context)
        # Add the region OpenGL drawing callback
        # space: 'WINDOW', 'HEADER', 'CHANNELS', 'TEMPORARY', 'UI', 'TOOLS', 'TOOL_PROPS', 'PREVIEW'
        # draw in view space: 'POST_PIXEL', 'POST_VIEW' or 'PRE_VIEW'
        self._handle = bpy.types.SpaceTextEditor.draw_handler_add(draw_callback_px, args, 'WINDOW', 'POST_PIXEL')

        self.mouse_path = []
        context.window_manager.modal_handler_add(self)
        return {'RUNNING_MODAL'}

def register():
    bpy.utils.register_class(ModalDrawOperator)

def unregister():
    bpy.utils.unregister_class(ModalDrawOperator)


if __name__ == "__main__":
    register()
    bpy.ops.text.modal_operator('INVOKE_DEFAULT')

It was possible to draw perfectly, but didn’t see the text drawing functions working.
has a solution? What is the solution then?Thanks in advance

2

you need to set a draw color:

    # draw some text
    bgl.glColor4f(1.0, 0.0, 0.0, 1.0)
    blf.position(font_id, 15, 30, 0)
    blf.size(font_id, 20, 72)
    blf.draw(font_id, "Hello Word " + str(len(self.mouse_path)))
3

You’re the man @CoDEmanX. Worked perfectly :slight_smile: