3D立方体使用画布。需要一点点的改进 [英] 3d cube using canvas. Need a little improvement

问题描述

我用下面的code使这个3D立方体

I made this 3d cube using the following code

Matrix mMatrix = canvas.getMatrix();

canvas.save();
camera.save();
camera.rotateY(-angle);
camera.getMatrix(mMatrix);
mMatrix.preTranslate(-width, 0);
mMatrix.postTranslate(width, 0);
canvas.concat(mMatrix);
canvas.drawBitmap(bmp1, 0, 0, null);
camera.restore();
canvas.restore();

camera.rotateY(90 - angle);
camera.getMatrix(mMatrix);
mMatrix.preTranslate(-width, 0);
mMatrix.postTranslate(width2, 0);
canvas.concat(mMatrix);
canvas.drawBitmap(bmp2, width, 0, null);

这是什么给了

不过，我需要的是

这是因为当摄像机旋转的图像，图像的一些部分被隐藏起来。 像这样的

It's because when Camera rotates the images, some part of the image gets hidden. Like this

但我认为这是可以做到。

But I think this can be done.

推荐答案

这是pretty的方便实际。图像必须减半翻译它的宽度/高度沿着它旋转的轴。

It was pretty easy actually. The image had to be translated by half it's width/height along the axis it was being rotated.

所以下面的变化做了

mMatrix.preTranslate(-width, -height / 2);
mMatrix.postTranslate(width, height / 2);

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