我不解决这个问题肯定存在简单的方法,但是这是可以做到这样的:
解析向量XML,所以你在运行所有这些变量。解析这里没有覆盖,让我们假设你有如下数据结构,我们将与以后的工作:
private static class VectorData {
private int width = 24;
private int height = 24;
private double viewportHeight = 1052.3622;
private double viewportWidth = 744.0945;
private String path = "M182.9,349.5m-74.7,0a74.7,74.7 0,1 1,149.3 0a74.7,74.7 0,1 1,-149.3 0";
private double scaleVectorX(Context context) {
return dpToPx(context, width)/viewportWidth;
}
private double scaleVectorY(Context context) {
return dpToPx(context, height)/viewportHeight;
}
private static float dpToPx(Context context, float dp) {
return dp * context.getResources().getDisplayMetrics().density;
}
}
正如你看到的所有字段都硬编码为简单起见。
下一步是解析矢量路径数据将其转换为android.graphics.Path:不包括
android.graphics.Path path = android.util.PathParser.createPathFromPathData(vectorData.path);
android.util.PathParser,但你可以在这里找到来源:https://android.googlesource.com/platform/frameworks/base/+/17e64ffd852f8fe23b8e2e2ff1b62ee742af17a6/core/java/android/util/PathParser.java。不知道它是如何合法复制和使用它。
有了路径,我们需要找到N个点(坐标)。详细点 - 更精确的结果将是与处理速度较慢:
final Collection<Point> points = getPoints(path, iv.getX(), iv.getY(), vectorData);
private static class Point {
private float x;
private float y;
Point(float x, float y) {
this.x = x;
this.y = y;
}
@Override
public String toString() {
return "Point{" +
"x=" + x +
", y=" + y +
'}';
}
}
private Collection<Point> getPoints(Path path, float viewX, float viewY, VectorData vectorData) {
Collection<Point> points = new ArrayList<>();
PathMeasure pm = new PathMeasure(path, false);
float length = pm.getLength();
float distance = 0f;
int size = N;
float speed = length/size;
int counter = 0;
float[] aCoordinates = new float[2];
while ((distance < length) && (counter < size)) {
// get point from the path
pm.getPosTan(distance, aCoordinates, null);
float pathX = aCoordinates[0];
float pathY = aCoordinates[1];
float x = (float) (vectorData.scaleVectorX(this) * pathX) + viewX;
float y = (float) (vectorData.scaleVectorY(this) * pathY) + viewY;
points.add(new Point(x, y));
counter++;
distance = distance + speed;
}
return points;
}
路径 - 是我们的道路,我们之前得到的,IV - 是矢量容器(ImageView的,例如),我们需要它以调整点的坐标。 vectorData - 是解析我们的矢量之前得到的结构。
现在,我们需要定义区域处理情况下通道被关闭,我们希望把里面的路径单击以0距离:
final Region region = new Region();
RectF rectF = new RectF();
path.computeBounds(rectF, true);
region.setPath(path, new Region((int) rectF.left, (int) rectF.top, (int) rectF.right, (int) rectF.bottom));
为了计算如下方法最小距离应使用:
private int getMinDistance(float eventX, float eventY, Collection<Point> pathPoints, Region pathRegion, VectorData vectorData) {
int minDistance = Integer.MAX_VALUE;
boolean contains = pathRegion.contains((int) (eventX/vectorData.scaleVectorX(this)), (int) (eventY/vectorData.scaleVectorY(this)));
if (contains) {
minDistance = 0;
} else {
for (Point point : pathPoints) {
int distance = getDistanceBetweenPoints((int) eventX, (int) eventY, (int) point.x, (int) point.y);
if (distance < minDistance) {
minDistance = distance;
}
}
}
return minDistance;
}
private int getDistanceBetweenPoints(int x, int y, int x1, int y1) {
return (int) Math.sqrt((x1 - x) * (x1 - x) + (y1 - y) * (y1 - y));
}
取决于您的代码可能“直截了当”。 – petey