Computer Graphics Output Primitives Quiz
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Questions and Answers

Which output primitive can be used to create a closed polyline that cannot be filled?

  • Text
  • GL_LINE_STRIP
  • GL_POLYGON
  • GL_LINE_LOOP (correct)

    • What attribute is used to define the fill color for polygons?

  • Size
  • Fill pattern
  • Thickness
  • Color Depth (correct)

    • Which output primitive is used to create images in computer graphics?

  • Text
  • GL_LINE_STRIP
  • GL_POLYGON
  • GL_IMAGE (correct)

    • Which attribute is used to define the font type and style in text output?

    <p>Font Type and Style</p> Signup and view all the answers

    What is the next value of Pinit in F(M2) dependent on?

    <p>xk and yk</p> Signup and view all the answers

    In which scenario does the algorithm stop iteration?

    <p>When y = 0 on axis of x</p> Signup and view all the answers

    What compensation is needed in line-drawing algorithms to remove jaggies?

    <p>Anti-aliasing</p> Signup and view all the answers

    What does increasing resolution in Super Sampling cause?

    <p>Increased memory bandwidth</p> Signup and view all the answers

    What is the condition to switch from region R1 to region R2?

    <p>b2(xk + 1) &gt;= a2(yk – 1/2)</p> Signup and view all the answers

    What is the initial condition for the first point on region R1?

    <p>(Pinit)R1 = 4b2 + a2(1 – 4b)</p> Signup and view all the answers

    What happens if the decision parameter Pk is less than 0 for choice pixel (E)?

    <p>Pk+1 = Pk + b2(2xk + 3)</p> Signup and view all the answers

    What is the gradient function for the slope at any point on the ellipse?

    <p>(2b2x)i + (2a2y)j</p> Signup and view all the answers

    In which region do we have the condition |df/dx| > |df/dy| ≡ slope 1?

    <p>Region R1</p> Signup and view all the answers

    How is the point (Q) obtained in the context of the midpoint ellipse algorithm?

    <p>By finding the slope to the curve with the condition |df/dx| = |df/dy|</p> Signup and view all the answers

    Study Notes

    Graphics Output Primatives

    • A closed polyline that cannot be filled is created using the "polyline" output primitive.
    • Images in computer graphics are created using the "raster" output primitive.

    Color and Style Attributes

    • The fill color for polygons is defined by the "fill color" attribute.
    • The font type and style in text output are determined using the "font" attribute.

    Algorithm Dependencies

    • The next value of Pinit in F(M2) depends on previous iterations or values calculated in the function.
    • The algorithm stops iteration when a certain convergence criterion is met or when a predefined maximum iteration limit is reached.

    Line-Drawing Techniques

    • To remove jaggies in line-drawing algorithms, a compensation technique such as anti-aliasing is needed.
    • Increasing resolution in Super Sampling often leads to smoother images but can also increase computation time and resource usage.

    Region Transition in Algorithms

    • Transition from region R1 to region R2 occurs based on specific conditions defined by the line's slope or decision parameters.
    • The initial condition for the first point on region R1 is typically set at the starting coordinates defined by the particular algorithm's logic.

    Decision Parameter in Algorithms

    • If the decision parameter Pk is less than 0 for the choice pixel (E), the next pixel should be plotted horizontally, indicating that the line is approaching the next pixel in the x-direction.

    Gradient and Slope Conditions

    • The gradient function for the slope at any point on the ellipse can be defined by taking the derivative of the ellipse equation.
    • Condition for |df/dx| > |df/dy|, which indicates slope 1, occurs in the area where x changes more rapidly than y in determining the ellipse's position.

    Midpoint Ellipse Algorithm

    • The point (Q) in the context of the midpoint ellipse algorithm is obtained by evaluating the midpoint between relevant pixel candidates, adjusting based on the decision parameter.

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    Description

    Test your knowledge of computer graphics output primitives with this quiz. The quiz covers topics such as drawing polylines, closed polylines, and their attributes such as color, thickness, and type.

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