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Lec1 - Agenda Review of Geometric Elements Intro of...

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1 Agenda • Review of Geometric Elements • Intro of Multiview Drawings – Observer Viewpoint – Projection lines – Plane of Projection • Principle Views • Review of Lines • Quiz Points, Lines Point - Theoretical Location that has neither width, height, or depth. Node- common reference in computer graphics to mean point Locus- represents all possible positions of a point- such as a locus of center points for circles Line is a geometric primitive that has length and direction but no thickness. Point, Lines, Nodes Graphic Representation

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Line Terminology • Straight Line- generated by a point moving in a constant direction- finite • Ray- straight infinite line • Parallel Lines- two or more lines that are a constant distance apart • Perpendicular Lines- two or more lines on a plane intersecting each other at a 90° angle, sometimes called normal • Intersecting Lines- two or more lines cross each other at a common point- no specific angle to each other Line Terminology • Tangency- when a straight line is in contact with a curve at a single point- usually at a 90º angle from a radius line from the center of the arc or circle Angles • Complete Circle- 360º Acute Angle- is an angle whose measure is greater than 0 but less than 90 degrees. Right Angle- is an angle whose measure is exactly 90 degrees. Obtuse Angle- is an angle whose measure is greater than 90 but less than 180 degrees. Straight Angle- Straight angle is an angle whose measure is exactly 180 degrees. Complementary Angles-
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Lec1 - Agenda Review of Geometric Elements Intro of...

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