angle

问题 I want to get the angle between two lines with respect to direction of the line. A normal dot product of the 2 vectors of the lines always returns the lowest angle between the two lines, which is not what I'm looking for. Example image: Blue lines: The lines I have Red lines: indication of the direction Green lines: failed attempt at a curving line that indicates the direction of the rotation I want. p0~p3: the x, y coordinates of the points of the lines. a: The angle I am looking to get. I

问题 I want to get the angle between two lines with respect to direction of the line. A normal dot product of the 2 vectors of the lines always returns the lowest angle between the two lines, which is not what I'm looking for. Example image: Blue lines: The lines I have Red lines: indication of the direction Green lines: failed attempt at a curving line that indicates the direction of the rotation I want. p0~p3: the x, y coordinates of the points of the lines. a: The angle I am looking to get. I

问题 Closed. This question is not reproducible or was caused by typos. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 1 year ago . Improve this question Suppose we have a=60 and B=60 . I am trying to calculate this area: when I try this: W = ((u^2)* cot(B) + (v^2 * cot(a))/8; I get this error: Incorrect dimensions for raising a matrix to a power. Check that the matrix is square and the power is a scalar. To

问题 I'm nuilding a graphical editor where you can select elements, scale them, rotate, resize etc. One thing I've been stuck on is positioning an element after it's rotated. I have the following javascript class that handles resizing: const rotateCoords = (x, y, rotation) => { const rad = (rotation * Math.PI) / 180 return { y: y * Math.cos(rad) - x * Math.sin(rad), x: x * Math.cos(rad) + y * Math.sin(rad), } } export default ( e, ratio, resizeDirection, resizeMouseX, resizeMouseY, zoomScale,

问题 How to rotate a div to certain height suppose 10px. I can rotate a div otherwise around 360 degrees. I need the angle by which the div would touch the line. 回答1: You can apply the coordinate formula of the circle: (x - a)² + (y - b)² = r² . Because we've interest in the angle only, we can position the circle on the origin, and ignore a and b , which makes the calculation much more simple. In the image, the green items are known, the cyan items are helpers, and the red items are the changes

问题 How to rotate a div to certain height suppose 10px. I can rotate a div otherwise around 360 degrees. I need the angle by which the div would touch the line. 回答1: You can apply the coordinate formula of the circle: (x - a)² + (y - b)² = r² . Because we've interest in the angle only, we can position the circle on the origin, and ignore a and b , which makes the calculation much more simple. In the image, the green items are known, the cyan items are helpers, and the red items are the changes

问题 How to rotate a div to certain height suppose 10px. I can rotate a div otherwise around 360 degrees. I need the angle by which the div would touch the line. 回答1: You can apply the coordinate formula of the circle: (x - a)² + (y - b)² = r² . Because we've interest in the angle only, we can position the circle on the origin, and ignore a and b , which makes the calculation much more simple. In the image, the green items are known, the cyan items are helpers, and the red items are the changes

来源： https://stackoverflow.com/questions/64580873/why-are-my-bullets-travelling-at-a-90-degree-angle-from-the-mouse

来源： https://stackoverflow.com/questions/64580873/why-are-my-bullets-travelling-at-a-90-degree-angle-from-the-mouse

来源： https://stackoverflow.com/questions/64580873/why-are-my-bullets-travelling-at-a-90-degree-angle-from-the-mouse