<｜begin▁of▁sentence｜>### Instruction:
As a Gymnastics Coach, you're familiar with the importance of precision and technique in every routine. Imagine you're preparing for an upcoming competition, and you want to create a visual aid for your gymnasts to understand a new formation. You decide to use a digital platform to design a diagram that represents a particularly challenging move – the Diamond formation. You aim to make it clear and visually appealing, ensuring your gymnasts grasp the concept easily. Your goal is to create a blue diamond with a bold black border, positioned at the center of the diagram. Once it's crafted, you plan to save it as a PNG file named 'diamond_example.png' for easy reference during training sessions.
### Response:
from igraph.drawing import Plot
from igraph.drawing.shapes import DiamondDrawer

# Create a plot with a predefined size
plot = Plot(surface=None, bbox=(300, 300), background='white')

# Let's say we need to draw a diamond at position (150, 150)
centroid = (150, 150)
# Instantiate the DiamondDrawer
diamond_drawer = DiamondDrawer(plot.ctx)

# Draw the path of the diamond (note that the draw_path method does not stroke or fill)
diamond_drawer.draw_path(centroid)

# Now let's stroke and fill the path to actually draw the diamond
plot.ctx.set_source_rgba(0, 0, 1, 1)  # Set blue color for the diamond
plot.ctx.fill_preserve()            # Fill the diamond
plot.ctx.set_source_rgba(0, 0, 0, 1)  # Set black color for the border
plot.ctx.stroke()                    # Stroke the border

# Save the plot to a file
plot.save('diamond_example.png')
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