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inexpensive jsp servlet

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inexpensive jsp servlet inexpensive jsp servlet for (int x = x0; x < xN; x++) { g.drawLine(x,(int) (yN*Math.sin(x)),x+1, (int) (yN*Math.sin(x+1))); } Here we loop across every x pixel of the applet. At each one we calculate the sine of that pixel.

inexpensive jsp servlet We also calculate the sine of the next pixel. This gives us two 2-D points and we draw a line between them. Since the sine of a real number is always between one and negative one, we scale the y value by yN. Finally we cast the y values to ints since sines are fundamentally floating point values but drawLine requires ints.This applet runs but it's got a lot of problems.

inexpensive jsp servlet All of them can be related to two factors: Sines are floating point operations. To do a really useful graphing applet we need to be able to use floating point numbers.The coordinate system of an applet counts from (0,0) at the upper left hand corner to the right and down. The standard Cartesian coordinate system we expect graphs to use counts from (0,0) in the lower left hand corner to the right and up. The origin can be moved in both systems, for instance to the center of the applet, but we still need to transform between the y down and the y up coordinates.

inexpensive jsp servlet There are a number of ways we can resolve this. The key to all of them, however, is to separate the data from the display. Since we are graphing more or less well behaved mathematical functions, we can assume that our data is completely described by a rectangle in Cartesian space within which we wish to plot a function. The display, on the other hand, is described by a rectangle of discrete points of fixed size and width. We need to be able to calculate in the general Cartesian plane and display in the particular applet window.

inexpensive jsp servlet

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inexpensive jsp servlet