Answer:
| actual x value | x' = x * 599/(2*PI) |
|---|---|
| 0.0 | 0 |
| 2*PI | 599 |
The answers are easy to figure out since multiplication by zero results in zero (at one end) and the (2*PI) in the numerator cancels the (2*PI) in the denominator (at the other end.)
| actual x value | x' = x * 599/(2*PI) |
|---|---|
| 0.0 | 0 |
| 2*PI | 599 |
The answers are easy to figure out since multiplication by zero results in zero (at one end) and the (2*PI) in the numerator cancels the (2*PI) in the denominator (at the other end.)
Since the equation is linear, all the points in between will also be correct.
Here is the same thing for the integer Y that is needed to graph the function.
Recall that the range of sin(x) (-1 to +1) is to be represented in an
applet with a height of 400 pixels.
So we need to map (-1 to +1) to (0 to 399).
| actual y value | integer y' to fit applet height |
|---|---|
| -1.0 | 399 |
| +1.0 | 0 |
Remember that Y=0 for applets corresponds to the top row and that Y=399 will be the bottom row. Do this by using another linear equation:
y' = -y * 399/2 + 399/2
But, there is a problem. The user might resize the window so that the width and height are not the 600 and 400 we have been planning on.
What methods of JPanel get the current width and height of the panel?