java instant double to int

Question

I have looked around but all conversions have used more than one line and variables. I am trying to paint objects in a certain co-ordinates times a double that changes when you change the size of the frame.

Width = getWidth();
Height = getHeight();
cWidth = 1900/Width;
cHeight = 1030/Height;

Inside the paint class,

g.fillOval (PlayerX/cWidth, PlayerY/cHeight, 50/cWidth, 50/cHeight);

but I get the error:

The method fillOval(int, int, int, int) in the type Graphics is not applicable for the arguments (double, double, double, double).

Would I have to make a separate variable for all 4 for every object painted or is there an easier way?

Answer 1

您必须将它们转换为int。

g.fillOval ((int)(PlayerX/cWidth), (int)(PlayerY/cHeight), (int)(50/cWidth), (int)(50/cHeight);

Answer 2

If your dont have a method like:

fillOval(double a, double b, double c, double d) 

you can not do

g.fillOval (PlayerX/cWidth, PlayerY/cHeight, 50/cWidth, 50/cHeight);

you need to pass integers not doubles, if loosing the presision is not a problem then try casting

g.fillOval ((int)(PlayerX/cWidth), (int)(PlayerY/cHeight), (int)(50/cWidth), (int)(50/cHeight));

Note:

you need to cast carefully grouping the result. the reason is:

PlayerX is a double, same as cWidth , so doing :

(int)PlayerX/cWidth

will not work, since the result is the same as int/double → double

---

 PlayerX/(int)cWidth

will not work either, since the result is the same as doublet/int → double

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the option that will work is

(int)(PlayerX/cWidth)