我一直在嘗試為Android做魔方.我有一個關于輪換的問題.我想旋轉一個外觀正確的圖形.這意味著如果用戶觸摸屏,并且在將手指向右移動之后,圖形將從觀察點的一側向右旋轉.但是當我旋轉一些時,圖形開始朝不正確的方向移動.我了解,這取決于軸是否改變了他們的狀況.但是我嘗試使用逆模型矩陣來獲取必要的坐標,但尚未得到結果.有人可以在鼠標或觸摸屏的幫助下給我示例或視覺上正確旋轉3D圖形的鏈接嗎？

//get vector 3D of touch

Vector3f touchVector = getRubikSystemCoordinates(mTouchX,mTouchY,square.rubikRotationMatrix);

//Get vector 3D of move

Vector3f moveVector = getRubikSystemCoordinates(mMoveX,mMoveY,square.rubikRotationMatrix);

//get direction of motion

float direction = touchVector.substractFrom(moveVector);

//get axis for rotation

Vector3f axis = touchVector.vectorProductTo(moveVector);

//normalize axis

axis.normalize();

//get angle of rotation

float angle = direction.length;

//make identity Quad

Quaternion quad = new Quaternion();

//make rotation quad

quad.makeRotationKvaternion(angle,axis);

//from quad recieve matrix

Matrix4f matrix = quad.toMatrix();

//multiply to current modelview matrix

gl.glMultMatrixf(matrix.returnArray(),0);

//save rotation matrix

square.rotationMatrix = square.rotationMatrix.multiply(matrix);

//save modelView matrix

square.saveModelView(square.initMatrix.returnArray());

// touch coords to current modelView coords

private Vector3f getRubikSystemCoordinates(float x, float y, Matrix4f matrix){

// touch coords to normal coords of screen

Vector2f normalCoords = (new Vector2f(x,y)).toNormalScreenCoordinates(Settings.viewPort[2],Settings.viewPort[3]);

// to sphere coords in 3D

Vector3f sphereVector = new Vector3f(normalCoords.x,normalCoords.y, FloatMath.sqrt(2-normalCoords.x*normalCoords.x-normalCoords.y*normalCoords.y));

//Get inverse matrix from ModelView Matrix

Matrix4f m = matrix.inverseMatrix();

//Get vector for current modelView 3D coords

Vector3f vector = m.multiplyToVector(vector);

// make normalize vector

vector.normalize();

return vector;

}

解決方法:

您要尋找的是名為arcball rotation.您將在互聯網上的Java周圍找到大量資源.

標簽：android,opengl-es,rubiks-cube

來源： https://codeday.me/bug/20191013/1904622.html

與50位技術專家面對面20年技術見證，附贈技術全景圖

總結

以上是生活随笔為你收集整理的android 触摸屏 旋转,android-使用OpenGl和触摸屏功能在视觉上纠正旋转的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。