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I wonder how I should increase and decrease the value of xPos and yPos to be able to move a sprite object diagonal and in different angles?

canvas.drawBitmap(image, xPos - (image.getWidth() / 2), yPos - (image.getHeight() / 2), null);
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-1, Really trivial to work out, lack of effort. –  Casper Von B Mar 22 '13 at 14:45
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2 Answers 2

up vote 3 down vote accepted

Casper gave a good answer, but you can also use sin and cos to move your sprite at a certain angle:

sprite.x += sin(angle) * amount;
sprite.y += cos(angle) * amount;

Of course, depending on what Sine and Cosine functions you're using, you may have to enter the angle in radians/degrees. Seeing as you're using Java, java.lang.Math comes with all the functions you'll need.

For more about sin and cos, look at this.

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I personally would discourage using sin and cos and just explain a bit linear algebra using vectors. But whatevs works for the person. –  Sidar Mar 22 '13 at 16:20
    
@Sidar Vectors are useful in some cases, yes, but if you want to work with angles you're gonna have to use some trigonometry at some point. –  Forgive Goto Mar 23 '13 at 1:00
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How about just working it out?

Assuming a coordinate system where 0, 0 is top-left. Defining our object's coordinates as being 0, 0 (x, y).

object.x += 50;
object.y += 50;

would move the object 50 pixels diagonally towards the bottom right corner.

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What's even the point of answering his question? I know it's easy to do (and a trivial way of getting +15 rep), but IMHO he should have to put in some work himself. Still, good answer to a bad question. –  Polar Mar 22 '13 at 14:51
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