Scaling sprite velocity / co-ordinatesin Android
- by user22241
I'm trying to find the answer to a question that I've had for a long time, but am having trouble finding it! I hope someone can help :-)
I'm trying to find information on how to scale sprite velocity / movement / co-ordinates.
What I mean by this is how do I get a sprite to move at the same speed relative to the screen size / DPI so that it takes the same amount of real-time to get from one side of the screen to the other?
All of the posts pertaining to sprite scaling that I can find on the various forums relate to the size of the sprite, but this part of it I'm OK with so far, it's just that when I move a sprite, it kind of gets there at different speed depending on the dpi / resolution of the device. I hope I'm making sense.
This is the code I have so far, instead of using explicit amounts, like 1, I'm using something like the following:
platSpeedFloat= (1 * (dpi/160)); //Use '1' so on an MDPI screen, the sprite will move by 1 physical pixel
Then basically what I'm doing is something like this: (all varialble previously declared)
platSpeedSave+=platSpeedFloat; //Add the platSpeedFloat value to the current platSpeedSave value
platSpeed=(int) platSpeedSave; //Cast to int so it can be checked in the following statement
if (platSpeed==platSpeedSave) //Check the casted int value to float value stored previoiusly
{floorY=floorY-platSpeed; //If they match then change the Y value
platSpeedSave=0;} //Reset
Would be grateful if someone could assists - hope I'm making sense. The above doesn't seems to work the sprite moves 'faster' on lower DPI screens.
Thanks
