how to create bubble shooter game in cocos2d?

pls any one help me . I am working on a project like bubble shooter,but i have no idea.now i have开发者_Go百科 to find only touch position angle .

    float radians=ccpToAngle(ccpSub(tchPoint, ballImg.position));
    float degrees = CC_RADIANS_TO_DEGREES( radians);

pls anybody help me ,and give an idea to implement this project.

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To find the angle of a vector v (CGPoint v) use atan2 (or atan2f function):

float angle = atan2(v.y, v.x);

The angle will be in radiance, counting from x axes.

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You already have the ball position (x,y), touch position (x',y') and the use angle (slope) and voila, you have a vector.