/*
 * Copyright (c) 2022 Huawei Device Co., Ltd.
 * 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.
 */

/**
 * @file graphic_geometry_math.h
 *
 * @brief Common library functions in Mathematics
 *
 * @since 1.0
 * @version 1.0
 */

#ifndef GRAPHIC_LITE_COMMON_MATH_H
#define GRAPHIC_LITE_COMMON_MATH_H


#include "gfx_utils/diagram/common/common_basics.h"

namespace OHOS {
/**
 * @brief Calculate vector cross product
 * @param X1, X2, X are the X coordinates of the vector point, Y1, Y2, y are the Y coordinates of the vector point
 * @return If the return value is greater than 0, it is counterclockwise; If the return value is less than 0,
 * it is clockwise; If the return value is equal to 0, it is collinear
 * @since 1.0
 * @version 1.0
 */
inline float CrossProduct(float x1, float y1, float x2, float y2, float x, float y)
{
    return (x - x2) * (y2 - y1) - (y - y2) * (x2 - x1);
}

/**
 * @brief Calculate the distance between two points
 * @param X1 and X2 are the X coordinates of the point, Y1 and Y2 are the Y coordinates of the point
 * @return The return value is the distance between two points
 * @since 1.0
 * @version 1.0
 */
inline float CalcDistance(float x1, float y1, float x2, float y2)
{
    float dx = x2 - x1;
    float dy = y2 - y1;
    return Sqrt(dx * dx + dy * dy);
}

/**
 * @brief Calculate the square of two points
 * @param X1 and X2 are the X coordinates of the point, Y1 and Y2 are the Y coordinates of the point
 * @return The return value is the square of two points
 * @since 1.0
 * @version 1.0
 */
inline float CalcSqDistance(float x1, float y1, float x2, float y2)
{
    float dx = x2 - x1;
    float dy = y2 - y1;
    return dx * dx + dy * dy;
}

/**
 * @brief Calculate whether the two line segments intersect and find the intersection
 * @param aX,bX,cX,dX are the X coordinates of the point, and ay, by, cy and dy are the Y coordinates of the point
 * @param X is the X coordinate pointer of the intersection point,
 * and Y is the Y coordinate pointer of the intersection point
 * @return The return value true is intersecting and false is disjoint
 * @since 1.0
 * @version 1.0
 */
inline bool CalcIntersection(float aX, float aY, float bX, float bY,
                             float cX, float cY, float dX, float dY,
                             float* x, float* y)
{
    float num = (aY - cY) * (dX - cX) - (aX - cX) * (dY - cY);
    float den = (bX - aX) * (dY - cY) - (bY - aY) * (dX - cX);
    if (MATH_ABS(den) < INTERSECTIONEPSILON) {
        return false;
    }
    float r = num / den;
    *x = aX + r * (bX - aX);
    *y = aY + r * (bY - aY);
    return true;
}
} // namespace OHOS
#endif