Rotary System in Java

To do rotations, you are going to want to look at Java's Graphics2D class.

This stack overflow thread shows how to rotate and image with G2D: http://stackoverflow.com/questions/7517688/rotate-a-java-graphics2d-rectangle.

One simple way to simulate a camera pan is to just subtract actual X,Y values from the cameras X,Y values.

For example:

sprite's X position = 10

cameras X position = 5

subtract: 10 - 5 = 5

now draw the sprite at 5, rather than 10.

Another way is to just render everything like normal to an image, and then change the X and Y position and rotation of that image, and then render the new image to the screen. Depending on how big this image is, this could sacrifice some performance.

Can you post some of your graphics code?

To do rotations, you are going to want to look at Java's Graphics2D class.

This stack overflow thread shows how to rotate and image with G2D: http://stackoverflow.com/questions/7517688/rotate-a-java-graphics2d-rectangle.

One simple way to simulate a camera pan is to just subtract actual X,Y values from the cameras X,Y values.

For example:

sprite's X position = 10

cameras X position = 5

subtract: 10 - 5 = 5

now draw the sprite at 5, rather than 10.

Another way is to just render everything like normal to an image, and then change the X and Y position and rotation of that image, and then render the new image to the screen. Depending on how big this image is, this could sacrifice some performance.

Can you post some of your graphics code?

thanks it realy helped me now i know how to rotate graphics, i know about how the drawing the sprite works, but how do i aply an collision detection on a circle object? sorry if i burden you. i will post my graphics code a few days again its not in my computer in the moment

To do rotations, you are going to want to look at Java's Graphics2D class.

This stack overflow thread shows how to rotate and image with G2D: http://stackoverflow.com/questions/7517688/rotate-a-java-graphics2d-rectangle.

One simple way to simulate a camera pan is to just subtract actual X,Y values from the cameras X,Y values.

For example:

sprite's X position = 10

cameras X position = 5

subtract: 10 - 5 = 5

now draw the sprite at 5, rather than 10.

Another way is to just render everything like normal to an image, and then change the X and Y position and rotation of that image, and then render the new image to the screen. Depending on how big this image is, this could sacrifice some performance.

Can you post some of your graphics code?

thanks it realy helped me now i know how to rotate graphics, i know about how the drawing the sprite works, but how do i aply an collision detection on a circle object? sorry if i burden you. i will post my graphics code a few days again its not in my computer in the moment

the easiest way to detect collission between two circles is to compare the square of the distance between them with the square of the sum of their radii.

bool circleTest(float x1, float y1, float radius1, float x2, float y2, float radius2) {
    float dx = x2 - x1;
    float dy = y2 - y1;
    float radii = radius1 + radius2;
    if ( ( dx * dx ) + ( dy * dy ) < radii * radii ) {
        return true;
    } else {
        return false;
    }
}