Question

我遇到CATransform3DTranslate问题。我使用来自KennyTM here

的代码将它与CATransform3D连接起来

我使用Photoshop测量坐标。这是我的完整代码：

background.image = UIImage(named: "backgroundtest")
gambar.image = UIImage(named: "imagetest")
gambar.layer.anchorPoint = CGPointZero

var translate = CATransform3DIdentity
translate = CATransform3DTranslate(translate, -160, -85.5, 0)

var perspective = CATransform3DIdentity
perspective = compute_transform_matrix(0.0, Y: 0.0, W: 320.0, H: 171.0, x1a: 81.5, y1a: 81.48, x2a: 294.44, y2a: 125.66, x3a: 22.02, y3a: 161.66, x4a: 270.21, y4a: 221.11)

gambar.layer.transform = CATransform3DConcat(perspective, translate)

并且该代码在iPhone 4s上完美运行 - iPhone 5s。但是当我使用iPhone 6或6 Plus模拟器时，它看起来并不正确。 here is the screenshot（红色矩形必须完全在绿色部分）。和here没有CATransform3DTranslate

这是compute_transform_matrix的代码：

func compute_transform_matrix(X:CGFloat, Y:CGFloat, W:CGFloat, H:CGFloat, x1a:CGFloat, y1a:CGFloat, x2a:CGFloat, y2a:CGFloat, x3a:CGFloat, y3a:CGFloat, x4a:CGFloat, y4a:CGFloat) -> CATransform3D {

        let y21 = y2a - y1a
        let y32 = y3a - y2a
        let y43 = y4a - y3a
        let y14 = y1a - y4a
        let y31 = y3a - y1a
        let y42 = y4a - y2a

        let a = -H*(x2a*x3a*y14 + x2a*x4a*y31 - x1a*x4a*y32 + x1a*x3a*y42)
        let b = W*(x2a*x3a*y14 + x3a*x4a*y21 + x1a*x4a*y32 + x1a*x2a*y43)
        let c0 = -H*W*x1a*(x4a*y32 - x3a*y42 + x2a*y43)
        let cx = H*X*(x2a*x3a*y14 + x2a*x4a*y31 - x1a*x4a*y32 + x1a*x3a*y42)
        let cy = -W*Y*(x2a*x3a*y14 + x3a*x4a*y21 + x1a*x4a*y32 + x1a*x2a*y43)
        let c = c0 + cx + cy

        let d = H*(-x4a*y21*y3a + x2a*y1a*y43 - x1a*y2a*y43 - x3a*y1a*y4a + x3a*y2a*y4a)
        let e = W*(x4a*y2a*y31 - x3a*y1a*y42 - x2a*y31*y4a + x1a*y3a*y42)
        let f0 = -W*H*(x4a*y1a*y32 - x3a*y1a*y42 + x2a*y1a*y43)
        let fx = H*X*(x4a*y21*y3a - x2a*y1a*y43 - x3a*y21*y4a + x1a*y2a*y43)
        let fy = -W*Y*(x4a*y2a*y31 - x3a*y1a*y42 - x2a*y31*y4a + x1a*y3a*y42)
        let f = f0 + fx + fy;

        let g = H*(x3a*y21 - x4a*y21 + (-x1a + x2a)*y43)
        let h = W*(-x2a*y31 + x4a*y31 + (x1a - x3a)*y42)
        let i0 = H*W*(x3a*y42 - x4a*y32 - x2a*y43)
        let ix = H*X*(x4a*y21 - x3a*y21 + x1a*y43 - x2a*y43)
        let iy = W*Y*(x2a*y31 - x4a*y31 - x1a*y42 + x3a*y42)
        var i = i0 + ix + iy

        let epsilon = CGFloat(0.0001);
        if fabs(i) < epsilon {
            i = epsilon * (i > 0 ? 1 : -1);
        }
        return CATransform3D(m11: a/i, m12: d/i, m13: 0, m14: g/i, m21: b/i, m22: e/i, m23: 0, m24: h/i, m31: 0, m32: 0, m33: 1, m34: 0, m41: c/i, m42: f/i, m43: 0, m44: 1.0)      
    }

有没有办法让红色矩形完全位于所有设备的绿色部分？或者如果我的方法有误，请建议我正确的。

谢谢。

imageView中的CATransform3dTranslate问题

0 个答案: