java函数确定具有给定宽度的图像的高度？

Question

i'm having an image(some dimensions) i set the width of some pixel position. i need a java method to calculate the height of the image to display properly.

Answer 1

Do you mean you want to maintain the original aspect ratio, you're changing the width and you want to know the height? If so, it should be something like:

int newHeight = (oldHeight * newWidth) / oldWidth;

Performing multiplication then division will avoid some rounding errors, but may fail if the image is huge (ie if it overflows). An alternative is to use floating point:

int newHeight = (int) (oldHeight * ((double) newWidth / oldWidth));

Answer 2

您是否在BLackberry appln中进行此操作，如果使用Display.getWidth（）进行计算