class ShapeDrawer:
Known subclasses: igraph.drawing.shapes.CircleDrawer, igraph.drawing.shapes.DiamondDrawer, igraph.drawing.shapes.DownTriangleDrawer, igraph.drawing.shapes.NullDrawer, igraph.drawing.shapes.RectangleDrawer, igraph.drawing.shapes.UpTriangleDrawer
Static class, the ancestor of all vertex shape drawer classes.
Custom shapes must implement at least the draw_path method of the class. The method must not stroke or fill, it should just set up the current Cairo path appropriately.
| Static Method | draw |
Draws the path of the shape on the given Cairo context, without stroking or filling it. |
| Static Method | intersection |
Determines where the shape centered at (center_x, center_y) intersects with a line drawn from (source_x, source_y) to (center_x, center_y). |
@abstractmethod
def draw_path(ctx, center_x, center_y, width, height=None, **kwargs): ¶
igraph.drawing.shapes.CircleDrawer, igraph.drawing.shapes.DiamondDrawer, igraph.drawing.shapes.DownTriangleDrawer, igraph.drawing.shapes.NullDrawer, igraph.drawing.shapes.RectangleDrawer, igraph.drawing.shapes.UpTriangleDrawerDraws the path of the shape on the given Cairo context, without stroking or filling it.
This method must be overridden in derived classes implementing custom shapes and declared as a static method using staticmethod(...).
| Parameters | |
| ctx | the context to draw on |
| center | the X coordinate of the center of the object |
| center | the Y coordinate of the center of the object |
| width | the width of the object |
| height | the height of the object. If None, equals to the width. |
| **kwargs | Undocumented |
igraph.drawing.shapes.CircleDrawer, igraph.drawing.shapes.DiamondDrawer, igraph.drawing.shapes.DownTriangleDrawer, igraph.drawing.shapes.RectangleDrawer, igraph.drawing.shapes.UpTriangleDrawerDetermines where the shape centered at (center_x, center_y) intersects with a line drawn from (source_x, source_y) to (center_x, center_y).
Can be overridden in derived classes. Must always be defined as a static method using staticmethod(...)
| Parameters | |
| center | Undocumented |
| center | Undocumented |
| source | Undocumented |
| source | Undocumented |
| width | the width of the shape |
| height | the height of the shape. If None, defaults to the width |
| Returns | |
| the intersection point (the closest to (source_x, source_y) if there are more than one) or (center_x, center_y) if there is no intersection | |