package com.reveregroup.carousel.client;
import com.google.gwt.dom.client.Element;
import com.google.gwt.event.dom.client.MouseDownEvent;
import com.google.gwt.event.dom.client.MouseDownHandler;
import com.google.gwt.user.client.ui.Image;
public class Utils {
public static void preventDrag(Image img) {
img.addMouseDownHandler(new MouseDownHandler() {
public void onMouseDown(MouseDownEvent event) {
event.preventDefault();
}
});
preventDragIE(img.getElement());
}
native private static void preventDragIE(Element element) /*-{
element.ondragstart = function() { return false; };
}-*/;
native public static void preventSelection(Element element) /*-{
element.style.MozUserSelect = 'none';
element.unselectable = 'on';
element.onselectstart = function() { return false; };
}-*/;
native public static void log(String s) /*-{
if (console) {
console.log(s);
}
}-*/;
public static double distanceForOneTick(double velocity, double acceleration) {
return velocity * (acceleration - 1) / Math.log(acceleration);
}
public static double velocityForDistance(double distance, double acceleration, double finalVelocity) {
if (distance < 0)
finalVelocity = -finalVelocity;
return finalVelocity - distance * Math.log(acceleration);
}
public static double ticksFromStartingVelocity(double velocity, double acceleration, double finalVelocity) {
if (velocity < 0)
finalVelocity = -finalVelocity;
return Math.log(finalVelocity / velocity) / Math.log(acceleration);
}
public static double distanceFromStartingVelocity(double velocity, double acceleration, double finalVelocity) {
if (velocity < 0)
finalVelocity = -finalVelocity;
return (finalVelocity - velocity) / Math.log(acceleration);
}
public static int modulus(int a, int b){
if(a < 0) {
a = a % b;
if (a < 0)
a += b;
return a;
} else if (a == 0) {
return 0;
}
return a % b;
}
public static double modulus (double a, int b){
if (a == 0.0)
return 0.0;
a = a - b * (((int) a) / b);
if (a < 0.0)
a += b;
return a;
}
}