By Leen Ammeraal, Kang Zhang
An exceptional many various and engaging visible results might be completed with special effects, for which a basic knowing of the underlying mathematical options – and an information of ways they are often carried out in a selected programming language – is essential.
Computer portraits for Java Programmers, second variation covers hassle-free ideas in growing and manipulating 2nd and 3D graphical items, masking themes from vintage pictures algorithms to point of view drawings and hidden-line elimination.
Completely revised and up-to-date all through, the second one variation of this hugely renowned textbook includes a host of ready-to-run-programs and labored examples, illuminating normal rules and geometric suggestions. perfect for lecture room use or self-study, it offers an ideal starting place for programming special effects utilizing Java.
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Extra info for Computer Graphics for Java Programmers
Example text
11 DISTANCE BETWEEN A POINT AND A LINE We can find the distance between a point P and a line l in different ways, depending on the way the line is specified. 11(a). This area is also equal to the product of the parallelogram's base AB and its height d. We can therefore compute d in the above way. 11: Distance between point P and line l If the line l is given as an equation, we assume this to be in the form where If the latter condition is not satisfied, we only have to divide a, b and h by the above square root.
If this orientation is clockwise, we use C, B and A, in that order, as the first three arguments of insideTriangle, so that the orientation of these arguments is counterclockwise, as required. If P lies neither on a triangle side nor inside the triangle, it lies outside it. 11 shows how to compute the distance between a point and a line. We perform this computation three times to determine which of the three triangle sides AB, BC and CA (or rather the infinite lines through these sides) lies closest to point P.
If P lies exactly on a polygon edge, the value returned by this method contains of the class Polygon can be true or false. 10 POINT-ON-LINE TEST Testing whether a point P lies on a given line is very simple if this line is given as an equation, say, Then all we need to do is to test whether the coordinates of P satisfy this equation. Due to inexact computations, such a test may fail when it should succeed. y - h) < eps) // P on the line where eps is some small positive value, such as 10−5. 7): Instead, we can benefit from the area2 method, which we are now familiar with.