解決了這個問題,不確定它是否是最好的方式,但它有效.解決方案是

首先翻譯畫布,使較大的畫布居中顯示

然后應用相機旋轉

然后在矩陣上使用pre和post translate方法來改變旋轉點,類似于android示例所做的.

缺少的部分是首先進行畫布翻譯,我也沒有使用更大的畫布大小來計算翻譯前和翻譯后方法的偏移量.

這是修改后的代碼,如果它可以幫助其他任何人.

// Center larger canvas in display (was made larger so

// corners will not show when rotated)

canvas.translate(-translateX,-translateY);

// Use the camera to rotate a view on any axis

camera.save();

camera.rotateX(0);

camera.rotateY(0);

camera.rotateZ(angle); // Rotate around Z access (similar to canvas.rotate)

camera.getMatrix(cameraMatrix);

// This moves the center of the view into the upper left corner (0,0)

// which is necessary because Matrix always uses 0,as it's transform point

cameraMatrix.preTranslate(-centerScaled,-centerScaled);

// NOTE: Camera Rotations logically happens here when the canvas has the

// matrix applied in the canvas.concat method

// This happens after the camera rotations are applied,moving the view

// back to where it belongs,allowing us to rotate around the center or

// any point we choose

cameraMatrix.postTranslate(centerScaled,centerScaled);

camera.restore();

canvas.concat(cameraMatrix);

如果有人有更好的方法或看到問題,請發表評論.

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