Questions and Answers
What does the function Rect(left, top, width, height) do in the canvas?
It draws a rectangle at the specified (left, top) position with the given width and height.
What is the default fill color for shapes drawn on the canvas if none is specified?
The default fill color is 'black'.
What effect does setting the dashes argument to True have on the border of a rectangle?
It enables a dashed appearance for the border of the rectangle.
How would you draw a rectangle with a green border and a specified border width of 4?
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If you want to create a rectangle with a dashed green border of 1 pixel dashes and 4 pixel gaps, what is the correct function call?
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What is required to create a custom RGB color using the rgb function?
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Explain the difference between a radial gradient and a linear gradient in shape drawing.
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What happens to shapes that are drawn first in the canvas?
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If you want to disable the fill of a rectangle, how should you set the fill argument?
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What is the purpose of the borderWidth argument in the Rect function?
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Study Notes
Canvas and Coordinates
- Canvas dimensions are 400 x 400 pixels.
- Coordinates are indicated by (x, y) points; x-values increase to the right, y-values increase downwards.
Drawing Rectangles
- Use
Rect(left, top, width, height)to draw rectangles. - The fill color can be set using the optional
fillargument; defaults to 'black'. - To omit filling, use
fill=None.
Drawing Order
- Shapes are drawn in the order created; later shapes overlap earlier ones.
Borders and Border Width
- To add a border, use the
borderproperty; for example,Rect(..., border='green'). - Border width can be customized with
borderWidth; default value is 2, for example:Rect(..., border='green', borderWidth=4).
Dashes
- Dashes can be enabled with
dashes=True. - Custom dash patterns can be defined using pairs of values (dashWidth, gapWidth), such as
(1, 4).
Color and Gradients
- Use predefined color names or create custom colors with
rgb(red, green, blue); each value ranges from 0 to 255. - Default gradient type is radial, which transitions from the center outwards; can use at least two colors (
gradient('red', 'green', 'blue')). - Linear gradients can start from a specific edge, e.g.
gradient('red', 'green', 'blue', start='left-top').
Opacity
- Opacity indicates how transparent a shape is, ranging from 0 (completely transparent) to 100 (completely opaque).
Shapes Overview
- Rectangles are drawn using
Rect(left, top, width, height). - Ovals are created with
Oval(centerX, centerY, width, height). - Circles can be drawn using
Circle(centerX, centerY, radius); identical to an oval where width equals height. - Lines are drawn with
Line(x1, y1, x2, y2); line thickness can be modified withlineWidth, which defaults to 2.
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Description
This quiz focuses on the concepts of position and size when drawing rectangles on a canvas. You will learn about the coordinates, fill colors, and how the drawing order affects visibility. Test your understanding of the Rect function and its parameters.
