慕桂英546537
我不认为这会直接回答我的问题，但它确实阻止了在同时使用 fill() 和 P2D 渲染器时发生的错误。正如上面 laancelot 所指出的，主要问题确实似乎与堆栈溢出有关。所以我用下面两种方式解决了这个问题；结论：直接原因是数学公式表达不佳。1) 在一个类中切换 RPoints。-我不认为这是错误发生的直接原因，因为在只重写代码的这一部分完成的阶段，错误仍然存在。但也许这是问题的一部分。我不知道。2）重写代码表达公式的部分，以评估特定点的贝塞尔曲线。- 以前，该公式是通过使用阶数为 n 的贝塞尔曲线的显式定义得出的。因此，必须为 RPoint 点中的每个点计算（更像是制作）公式。正如关于贝塞尔曲线的维基百科页面上提到的，不推荐这种计算方式。-在修改后的代码中，用于扭曲文本的公式以多项式形式表示。因此，它能够在迭代 RPoint 点之前预先计算多项式的系数。这似乎已经解决了问题。我仍然不确定到底是什么导致了这个问题，为什么它已经解决了，我应该展示代码的哪一部分来向其他人解释这个问题，所以我将分享已经重写的整个代码。您需要处理、几何库和数据文件夹中的 ttf 类型字体文件来测试代码。牵扯到修改版公式的地方我都标出来了。（还是真的很乱。。。）//n number of pointsint num = 4;//arraylist to store the picked valuesArrayList<cntrlPoint> pt;//import the geomerative libraryimport geomerative.*;//stringString str = "(O_o)/ Oooh";FloatList X;FloatList Y;FloatList SUM;RClass rc;void setup() { size(1000, 1000, P2D); pt = new ArrayList<cntrlPoint>(); //pick a number of points with random positions for (int i=0; i<=num; i++) { float x = random(0, width); float y = random(0, height); pt.add(new cntrlPoint(x, y)); } RG.init(this); rc = new RClass(); X = new FloatList(); Y = new FloatList(); SUM = new FloatList();}void draw() { background(255); noFill(); strokeWeight(2); drwCntrlPoints(); drwCurve(); gtArcLength(); fill(0,255,0); rc.crtPoly(pt); rc.drwText();}void drwCntrlPoints() { //draw points beginShape(); for (int i=0; i<=num; i++) { vertex(pt.get(i).x, pt.get(i).y); } endShape(); for (int i=0; i<=num; i++) { ellipse(pt.get(i).x, pt.get(i).y, 10, 10); }}void drwCurve() { //draw curve float curveDetail = 0.01; float nfac = 1; for (int i=0; i<num; i++) { nfac *= (i+1); } int arcIndex = 0; strokeWeight(2); beginShape(); for (float t=0; t<=1; t+=curveDetail) { float x = 0; float y = 0; arcIndex++; for (int i=0; i<=num; i++) { float coef = 1; float kfac = 1; float k_nfac = 1; for (int k=i; k>0; k--) { kfac *= k; } for (int k=(num-i); k>0; k--) { k_nfac *= k; } coef = nfac/(kfac*k_nfac); x += coef*(pow((1-t), num-i)*pow(t, i)*pt.get(i).x); y += coef*(pow((1-t), num-i)*pow(t, i)*pt.get(i).y); } vertex(x, y); X.set(arcIndex, x); Y.set(arcIndex, y); } endShape();}void gtArcLength() { //get arclength by pulling points from a floatlist int numberOfDivisions = X.size()-2; int maxPoint = numberOfDivisions+1; float sum = 0; float prevPointX = X.get(0); float prevPointY = Y.get(0); for (int i=1; i<=maxPoint; i++) { float pointX = X.get(i); float pointY = Y.get(i); sum += dist(pointX, pointY, prevPointX, prevPointY); SUM.set(i-1, sum); prevPointX = pointX; prevPointY = pointY; }}//*******factorialint fact(int fa){ if(fa==1){ return 1; } if(fa==0){ return 1; } else{ return fa*fact(fa-1); }}//********************int IndexOfLargestValueSmallerThan(float _targetArcLength) { int index = 0; for (int i=0; i<SUM.size()-1; i++) { if (SUM.get(i)<=_targetArcLength) { index = i; } } return index;}void mouseDragged() { int which = -1; if ((mouseX<width)&&(mouseX>0)&&(mouseY<height)&&(mouseY>0)) { for (int i=0; i<=num; i++) { if (dist(mouseX, mouseY, pt.get(i).x, pt.get(i).y)<80) { which = i; } } if (which>-1) { pt.get(which).update(mouseX, mouseY); } }}class RClass { //get ttf file //create rfont RFont fnt; //turn rfont to rgroup to get points RGroup rg; //going to get point in path, so that the characters in the string can be seperated RPoint [][]rp; //floatlist to store coefficients FloatList Cx; FloatList Cy; RClass() { fnt = new RFont("Zapfino.ttf", 100); rg = fnt.toGroup(str); rp = rg.getPointsInPaths(); //RCommand.setSegmentAngle(random(0,HALF_PI)); //RCommand.setSegmentator(RCommand.ADAPTATIVE); RCommand.setSegmentLength(3); RCommand.setSegmentator(RCommand.UNIFORMLENGTH); Cx = new FloatList(); Cy = new FloatList(); } //**********************************here void crtPoly(ArrayList<cntrlPoint> _pt){ float ptsize = _pt.size(); for(int j=0; j<ptsize; j++){ float coefx = 0; float coefy = 0; float pi = 1; float sigx = 0; float sigy = 0; for(int m=0; m<=j-1; m++){ pi *= (ptsize-1-m); } for(int i=0; i<=j; i++){ sigx += (pow(-1,i+j)*pt.get(i).x)/(fact(i)*fact(j-i)); sigy += (pow(-1,i+j)*pt.get(i).y)/(fact(i)*fact(j-i)); } coefx = pi*sigx; coefy = pi*sigy; Cx.set(j,coefx); Cy.set(j,coefy); } } //************************************** void drwText() { float indent = SUM.get(0); beginShape(); for (int i=0; i<rp.length; i++) { if(i>0){ beginContour(); } for (int j=0; j<rp[i].length; j++) { float t = 0; indent = rp[i][j].x+SUM.get(0); float targetArcLength = indent; int index = IndexOfLargestValueSmallerThan(targetArcLength); if (SUM.get(index)==targetArcLength) { t = index/(SUM.size()-1); } else { float lengthBefore = SUM.get(index); float lengthAfter = SUM.get(index+1); float segmentLength = lengthAfter - lengthBefore; float segmentFraction = (targetArcLength - lengthBefore)/segmentLength; t = (index+segmentFraction)/(SUM.size()-1); } //***************************here float x = 0; float y = 0; float vx = 0; float vy = 0; for(int l=0; l<=num; l++){ x += Cx.get(l)*pow(t,l); y += Cy.get(l)*pow(t,l); } for(int l=1; l<=num; l++){ vx += l*Cx.get(l)*pow(t,l-1); vy += l*Cy.get(l)*pow(t,l-1); } //************************************** PVector P = new PVector(x, rp[i][j].y+y); PVector ldir = new PVector(P.x-x, P.y-y); PVector dir = new PVector(vy, -vx); // ldir.rotate(dir.heading()+PI/2); vertex(x+ldir.x, y+ldir.y); } if(i>0&&i<rp.length){ endContour(); } } endShape(); }}class cntrlPoint{ float x,y; cntrlPoint(float _x, float _y){ x = _x; y = _y; } void update(float _newx, float _newy){ x = _newx; y = _newy; }}