【文件属性】：
文件名称：贝塞尔曲线
文件大小：26.29MB
文件格式：RAR
更新时间：2020-10-15 07:59:25
贝塞尔曲线
从2阶到7阶的贝赛尔曲线
private static final int MAX_COUNT = 7; // 贝塞尔曲线最大阶数
private static final int REGION_WIDTH = 30; // 合法区域宽度
private static final int FINGER_RECT_SIZE = 60; // 矩形尺寸
private static final int BEZIER_WIDTH = 10; // 贝塞尔曲线线宽
private static final int TANGENT_WIDTH = 6; // 切线线宽
private static final int CONTROL_WIDTH = 12; // 控制点连线线宽
private static final int CONTROL_RADIUS = 12; // 控制点半径
private static final int TEXT_SIZE = 40; // 文字画笔尺寸
private static final int TEXT_HEIGHT = 60; // 文本高度
private static final int RATE = 10; // 移动速率
private static final int HANDLER_WHAT = 100;
private static final int FRAME = 1000; // 1000帧
private static final String[] TANGENT_COLORS = {"#7fff00", "#7a67ee", "#ee82ee", "#ffd700", "#1c86ee",
"#8b8b00"}; // 切线颜色
private static final int STATE_READY = 0x0001;
private static final int STATE_RUNNING = 0x0002;
private static final int STATE_STOP = 0x0004;
private static final int STATE_TOUCH = 0x0010;
private Path mBezierPath = null; // 贝塞尔曲线路径
private Paint mBezierPaint = null; // 贝塞尔曲线画笔
private Paint mMovingPaint = null; // 移动点画笔
private Paint mControlPaint = null; // 控制点画笔
private Paint mTangentPaint = null; // 切线画笔
private Paint mLinePaint = null; // 固定线画笔
private Paint mTextPointPaint = null; // 点画笔
private Paint mTextPaint = null; // 文字画笔
private ArrayList
mBezierPoints = null; // 贝塞尔曲线点集
private PointF mBezierPoint = null; // 贝塞尔曲线移动点
private ArrayList mControlPoints = null; // 控制点集
private ArrayList>> mTangentPoints; // 切线点集
private ArrayList> mInstantTangentPoints;
private int mR = 0; // 移动速率
private int mRate = RATE; // 速率
private int mState; // 状态
private boolean mLoop = false; // 设置是否循环
private boolean mTangent = true; // 设置是否显示切线
private int mWidth = 0, mHeight = 0; // 画布宽高
private PointF mCurPoint; // 当前移动的控制点
private Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
if (msg.what == HANDLER_WHAT) {
mR += mRate;
if (mR >= mBezierPoints.size()) {
removeMessages(HANDLER_WHAT);
mR = 0;
mState &= ~STATE_RUNNING;
mState &= ~STATE_STOP;
mState |= STATE_READY | STATE_TOUCH;
if (mLoop) {
start();
}
return;
}
if (mR != mBezierPoints.size() - 1 && mR + mRate >= mBezierPoints.size()) {
mR = mBezierPoints.size() - 1;
}
// Bezier点
mBezierPoint = new PointF(mBezierPoints.get(mR).x, mBezierPoints.get(mR).y);
// 切线点
if (mTangent) {
int size = mTangentPoints.size();
ArrayList instantpoints;
mInstantTangentPoints = new ArrayList<>();
for (int i = 0; i < size; i++) {
int len = mTangentPoints.get(i).size();
instantpoints = new ArrayList<>();
for (int j = 0; j < len; j++) {
float x = mTangentPoints.get(i).get(j).get(mR).x;
float y = mTangentPoints.get(i).get(j).get(mR).y;
instantpoints.add(new PointF(x, y));
}
mInstantTangentPoints.add(instantpoints);
}
}
if (mR == mBezierPoints.size() - 1) {
mState |= STATE_STOP;
}
invalidate();
}
}
};
