Canvas.cpp

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#include "Canvas.h"
 
void dyno::Canvas::addPoint(float x, float y)
{
    Coord2D a = Coord2D(x, y);
    mUserCoord.push_back(a);
 
    UpdateFieldFinalCoord();
}
 
void dyno::Canvas::addPointAndHandlePoint(Coord2D point, Coord2D handle_1, Coord2D handle_2)
{
    mUserCoord.push_back(point);
    mUserHandle.push_back(handle_1);
    mUserHandle.push_back(handle_2);
 
    UpdateFieldFinalCoord();
}
 
void dyno::Canvas::addFloatItemToCoord(float x, float y, std::vector<Coord2D>& coordArray)
{
    Coord2D s;
    s.set(x, y);
    coordArray.push_back(s);
}
 
void dyno::Canvas::useBezier()
{
    setInterpMode(true);
}
 
void dyno::Canvas::useLinear()
{
    setInterpMode(false);
}
 
 
void dyno::Canvas::updateBezierCurve()
{
    mBezierPoint.clear();
 
    int n = mUserCoord.size();
    int bn = mUserHandle.size();
 
    if (bn != 2 * n)
    {
        rebuildHandlePoint(mUserCoord);
    }
 
    for (int i = 0; i < n - 1; i++)
    {
        Coord2D p0 = mUserCoord[i];
        Coord2D p1 = mUserHandle[2 * i + 1];
        Coord2D p2 = mUserHandle[2 * (i + 1)];
        Coord2D p3 = mUserCoord[i + 1];
        updateBezierPointToBezierSet(p0, p1, p2, p3, mBezierPoint);
    }
    if (mClose && n >= 3)
    {
        Coord2D p0 = mUserCoord[n - 1];
        Coord2D p1 = mUserHandle[bn - 1];
        Coord2D p2 = mUserHandle[0];
        Coord2D p3 = mUserCoord[0];
        updateBezierPointToBezierSet(p0, p1, p2, p3, mBezierPoint);
    }
    if (mClose)
    {
        if (mUserCoord.size())
        {
            mBezierPoint.push_back(mUserCoord[0]);
        }
    }
    else
    {
        if (mUserCoord.size())
        {
            mBezierPoint.push_back(mUserCoord[mUserCoord.size() - 1]);
        }
    }
}
 
void dyno::Canvas::updateBezierPointToBezierSet(Coord2D p0, Coord2D p1, Coord2D p2, Coord2D p3, std::vector<Coord2D>& bezierSet)
{
 
    Coord2D P[4] = { p0,p1,p2,p3 };
 
    int n = 4;
    Coord2D Pf;
    float t;
    float unit = 1.0f / 15.0f;  //bezier resolution
 
    for (t = 0; t < 1; t += unit)
    {
        P[0] = p0;
        P[1] = p1;
        P[2] = p2;
        P[3] = p3;
 
        int x = n;
        while (1)
        {
            if (x == 1)
                break;
            for (int i = 0; i < x - 1; i++)
            {
                Pf.x = (P[i + 1].x - P[i].x) * t + P[i].x;
                Pf.y = (P[i + 1].y - P[i].y) * t + P[i].y;
                P[i] = Pf;
 
            }
            x--;
        }
        bezierSet.push_back(Pf);
    }
}
 
void dyno::Canvas::updateResampleLinearLine()
{
    std::vector<Coord2D> temp;
    temp.assign(mUserCoord.begin(), mUserCoord.end());
    if (mClose && temp.size() >= 3)
    {
        temp.push_back(mUserCoord[0]);
    }
    buildSegMent_Length_Map(temp);
    resamplePointFromLine(temp);
 
}
 
void dyno::Canvas::resamplePointFromLine(std::vector<Coord2D> pointSet)
{
    Coord2D P;//»­µã
    float uL = mSpacing / 100;
    float curL = 0;
    int n;
    if (mLength_EndPoint_Map.size())
    {
        n = (--mLength_EndPoint_Map.end())->first / uL;
    }
    double addTempLength = 0;
 
    mResamplePoint.clear();
    if (mUserCoord.size() >= 2)
    {
        for (size_t i = 0; i < mLengthArray.size(); i++)
        {
            double tempL = mLengthArray[i];
            auto it = mLength_EndPoint_Map.find(tempL);
            EndPoint ep = it->second;
 
            while (true)
            {
                if (addTempLength >= mLengthArray[i])
                {
                    break;
                }
                else
                {
                    double subL = mLengthArray[i] - addTempLength;
                    double curLineL;
                    if (i > 0)
                    {
                        curLineL = mLengthArray[i] - mLengthArray[i - 1];
                    }
                    else
                    {
                        curLineL = mLengthArray[0];
                    }
                    double per = 1 - subL / curLineL;
 
                    P.x = per * (pointSet[ep.second].x - pointSet[ep.first].x) + pointSet[ep.first].x;
                    P.y = per * (pointSet[ep.second].y - pointSet[ep.first].y) + pointSet[ep.first].y;
 
                    mResamplePoint.push_back(P);
                    addTempLength += uL;
                }
 
            }
 
        }
        if (mClose)
        {
            mResamplePoint.push_back(mUserCoord[0]);
        }
        else
        {
            mResamplePoint.push_back(mUserCoord[mUserCoord.size() - 1]);
        }
    }
}
 
void dyno::Canvas::rebuildHandlePoint(std::vector<Coord2D> coordSet)
{
    mUserHandle.clear();
    int ptnum = coordSet.size();
    for (size_t i = 0; i < ptnum; i++)
    {
        dyno::Vec2f P(coordSet[i].x, coordSet[i].y);
        dyno::Vec2f p1;
        dyno::Vec2f p2;
        dyno::Vec2f N;
 
        int id = i;
        int f;
        int s;
        if (ptnum < 2)
        {
            N = Vec2f(1, 0);
        }
        else
        {
            f = id - 1;
            s = id + 1;
            if (id == 0)//Ê×µã
            {
                N[0] = coordSet[s].x - coordSet[id].x;
                N[1] = coordSet[s].y - coordSet[id].y;
            }
            else if (id == ptnum - 1)//Ä©µã
            {
                N[0] = coordSet[id].x - coordSet[f].x;
                N[1] = coordSet[id].y - coordSet[f].y;
            }
            else//Öмäµã
            {
                N[0] = coordSet[s].x - coordSet[f].x;
                N[1] = coordSet[s].y - coordSet[f].y;
            }
        }
 
        N.normalize();
        double length = 0.05;
        p1 = P - N * length;
        p2 = P + N * length;
 
        mUserHandle.push_back(Coord2D(p1));
        mUserHandle.push_back(Coord2D(p2));
 
    }
}
 
void dyno::Canvas::buildSegMent_Length_Map(std::vector<Coord2D> BezierPtSet)
{
    mLength_EndPoint_Map.clear();
    mLengthArray.clear();
    std::vector<Coord2D> temp;
 
    double length = 0;
 
    int n = BezierPtSet.size();
    if (BezierPtSet.size())
    {
        for (size_t k = 0; k < n - 1; k++)
        {
            int e = k;
            int f = k + 1;
            length += sqrt(std::pow((BezierPtSet[f].x - BezierPtSet[e].x), 2) + std::pow((BezierPtSet[f].y - BezierPtSet[e].y), 2));
            mLengthArray.push_back(length);
            mLength_EndPoint_Map[length] = EndPoint(e, f);
 
        }
    }
 
}
 
void dyno::Canvas::setInterpMode(bool useBezier)
{
    mInterpMode = useBezier ? Interpolation::Bezier : Interpolation::Linear;
}
 
void dyno::Canvas::clearMyCoord()
{
    mUserCoord.clear();
 
    mBezierPoint.clear();
    mUserHandle.clear();
}