Question

从这段代码我有一些关于sqrt，sin＆amp; amp的问题。 cos无法解析方法且EPSILON无法解析符号。我是否需要为sin cos＆amp;添加数学库？开方？如果是，你可以给我下载jar的链接吗？

float omegaMagnitude = sqrt(axisX*axisX + axisY*axisY + axisZ*axisZ);

        // Normalize the rotation vector if it's big enough to get the axis
        // (that is, EPSILON should represent your maximum allowable margin of error)
        if (omegaMagnitude > EPSILON) {
            axisX /= omegaMagnitude;
            axisY /= omegaMagnitude;
            axisZ /= omegaMagnitude;
        }

        // Integrate around this axis with the angular speed by the timestep
        // in order to get a delta rotation from this sample over the timestep
        // We will convert this axis-angle representation of the delta rotation
        // into a quaternion before turning it into the rotation matrix.
        float thetaOverTwo = omegaMagnitude * dT / 2.0f;
        float sinThetaOverTwo = sin(thetaOverTwo);
        float cosThetaOverTwo = cos(thetaOverTwo);

Answer 1

您不必下载任何其他库。使用Math.sin(x), Math.cos(x) and Math.sqrt(x)或sin(x), cos(x) and sqrt(x)并将以下代码放在文件顶部（但在package [...]行下方（如果有）：

// For Math.xxx()
import java.lang.Math;

// For xxx()
import static java.lang.Math.sin;
import static java.lang.Math.cos;
import static java.lang.Math.sqrt;

如果您正在使用Eclipse，只需按Ctrl + Shift + O即可自动整理导入（其他IDE应该有类似的快捷方式）。

问题无法解决方法＆amp;符号

1 个答案: