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Exam 12: Canvas

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Question 21

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Which of the following is the context object property in charge of specifying vertical alignment for text in the canvas drawing area?

A) alignHorizontal
B) textAlign
C) textBaseline

D) A) and B)
E) A) and C)

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Question 22

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How do you specify the color for the interior of a rectangle?

A) Use the rectangle object to call the <code>setColor</code> method.
B) Use the rectangle object to call the <code>setInterior</code> method.
C) Before calling <code>fillRect</code>, assign a color value to the context object's <code>fillStyle</code> property.

D) A) and B)
E) None of the above

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Question 23

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Given the following syntax for the arc method, what do x and y represent? <code>context.arc(x, y, radius, start-angle, end-angle, counterclockwise) ;</code>

When assigning colors for canvas shapes, you can use any of the color value formats that are used for CSS.

What does the following method call do? context.setTransform(1, 0, 0, 1, 0, 0);

After the browser engine assigns a value to the context object's lineWidth property, that line width will be used for all subsequent line drawings until the lineWidth property is reassigned.

If you would like your drawn rectangle's border to have a line width equal to the value specified by the lineWidth property, you should call the strokeRect method before the fillRect method.

To rotate around a position different from the coordinate system's origin, you should first call <code>translate</code> to move the origin so it is centered at the position where you want the rotation to take place.

Given the following syntax for the clearRect method, if you want to clear the entire canvas drawing area, what values are appropriate for the method's third and fourth arguments? Context.clearRect(top-left-x, top-left-y, width, height) ;

Given the following syntax for the clearRect method, if you want to clear the entire canvas drawing area, what values are appropriate for the method's first two arguments? Context.clearRect(top-left-x, top-left-y, width, height) ;