手势密码解锁

效果图

手指触摸时绘制两个点之间的连线了。如下图

两个点之间连线是内圆之外与内圆之外的连线，怎么计算这两个点的位置呢？如下图

/**
 * 绘制两个点之间的连线
 *
 * @param canvas
 * @param start
 * @param end
 */
private void drawLine(Canvas canvas, Point start, Point end) {
    //两点之间的距离
    double pointDistance = MathUtil.distance(end.centerX, end.centerY, start.centerX, start.centerY);
    float dx = end.centerX - start.centerX;
    float dy = end.centerY - start.centerY;
    float rx = (float) ((dx / pointDistance) * (mDotRadius / 6));
    float ry = (float) ((dy / pointDistance) * (mDotRadius / 6));
    canvas.drawLine(start.centerX + rx, start.centerY + ry,
            end.centerX - rx, end.centerY - ry, mLinePaint);
}

License

Copyright 2018 StevenYan88

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0  

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

StevenYan88/GesturePasswordView

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