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package com.android.imooc.goo;import android.graphics.PointF;/** * 几何图形工具 */public class GeometryUtil {
       /**     * As meaning of method name. 获得两点之间的距离     *      * @param p0     * @param p1     * @return     */    public static float getDistanceBetween2Points(PointF p0, PointF p1) {        float distance = (float) Math.sqrt(Math.pow(p0.y - p1.y, 2) + Math.pow(p0.x - p1.x, 2));        return distance;    }    /**     * Get middle point between p1 and p2. 获得两点连线的中点     *      * @param p1     * @param p2     * @return     */    public static PointF getMiddlePoint(PointF p1, PointF p2) {        return new PointF((p1.x + p2.x) / 2.0f, (p1.y + p2.y) / 2.0f);    }    /**     * Get point between p1 and p2 by percent. 根据百分比获取两点之间的某个点坐标     *      * @param p1     * @param p2     * @param percent     * @return     */    public static PointF getPointByPercent(PointF p1, PointF p2, float percent) {        return new PointF(evaluateValue(percent, p1.x, p2.x), evaluateValue(percent, p1.y, p2.y));    }    /**     * 根据分度值，计算从start到end中，fraction位置的值。fraction范围为0 -> 1     *      * @param fraction     * @param start     * @param end     * @return     */    public static float evaluateValue(float fraction, Number start, Number end) {        return start.floatValue() + (end.floatValue() - start.floatValue()) * fraction;    }    /**     * Get the point of intersection between circle and line. 获取     * 通过指定圆心，斜率为lineK的直线与圆的交点。     *      * @param pMiddle     *            The circle center point.     * @param radius     *            The circle radius.     * @param lineK     *            The slope of line which cross the pMiddle.     * @return     */    public static PointF[] getIntersectionPoints(PointF pMiddle, float radius, Double lineK) {        PointF[] points = new PointF[2];        float radian, xOffset = 0, yOffset = 0;        if (lineK != null) {            radian = (float) Math.atan(lineK);            xOffset = (float) (Math.sin(radian) * radius);            yOffset = (float) (Math.cos(radian) * radius);        } else {            xOffset = radius;            yOffset = 0;        }        points[0] = new PointF(pMiddle.x + xOffset, pMiddle.y - yOffset);        points[1] = new PointF(pMiddle.x - xOffset, pMiddle.y + yOffset);        return points;    }}

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