我正在用C ++做一个以前的作业，并试图弄清楚如何获得正确的ASCII X-Y图。
所以真正发生的是给用户一个菜单，允许他们选择一个特定的trig函数。所有函数的范围在[-4..6]之间，对于X和[-12 ... 5]， Y.Next用户将被允许选择渐变量（或受限制的x和y范围之间的值），如果他们想要查看结果值或Bitmap。最终输出将在值/位图中。我已粘贴wolfram alpha链接对于评论中的功能。
我所做的是在2D输出中每列增加1 /（gradu-1）的乘积（即，如果刻度值为4，则为1/3）和列＃。一旦该产品达到1，我就没有得到正确的output代表值。
#include <iostream>
#include <cmath>
using namespace std;
double minX=-4;
double maxX=6;
double minY=-12;
double maxY=5;
void displayValues(double result[],int result_size,int graduationVal,double percentIncrease,int menuSelection){
int displaySelection=0;
cerr<<"(0) Bitmap or (1) Values?";
cin>>displaySelection;
int k=0;
int i=0;
int division=0;
//Add Values into array until result-1 values
while(i < result_size){
//cout<<"Before j";
//Calculate all the horizontal axis values
for(int j=0; j< graduationVal;j++){
if(displaySelection==1){
//cout<<"In if";
if(menuSelection==1){
result[i]=sin(minX+(percentIncrease*j))*cos(minY+(percentIncrease*k));
cout<<"\n Increase in value of x by "<<percentIncrease*j<<" ";
cout<<"Increase in value of y by "<<percentIncrease*k<<"\n";
//cout<<sin(minX+(percentIncrease*j))<<"\n";
//cout<<cos(minY+(percentIncrease*k))<<"\n";
cout<<result[i]<<" ";
}else if(menuSelection==2){
result[i]=sin(minX+(percentIncrease*j))+pow(cos(minY+(percentIncrease*j)),2)-(minX+(percentIncrease*j))/(minY+(percentIncrease*k));
cout<<"\n Increase in value of x by "<<percentIncrease*j<<" ";
cout<<"Increase in value of y by "<<percentIncrease*k<<"\n";
cout<<result[i]<<" ";
}else if(menuSelection==3){
result[i]=(0.5 * sin(minX+(percentIncrease*j)))+(0.5 *cos(minY+(percentIncrease*k)));
cout<<"\n Increase in value of x by "<<percentIncrease*j<<" ";
cout<<"Increase in value of y by "<<percentIncrease*k<<"\n";
cout<<result[i]<<" ";
}else if(menuSelection==4){
result[i]=(0.5 * sin(minX+(percentIncrease*j)))+(minX+(percentIncrease*j)) * cos(3 * (minY+(percentIncrease*k)));
cout<<result[i]<<" ";
}
//cout<<"J is"<<j<<"\n";
//cout<<"K is"<<k<<"\n";
//cout<<"I is"<<i<<"\n";
}else{
if(menuSelection==1){
result[i]=sin(minX+(percentIncrease*j))*cos(minY+(percentIncrease*k));
cout<<((result[i] > 0 )?"O":"X");
}else if(menuSelection==2){
result[i]=sin(minX+(percentIncrease*j))+pow(cos(minY+(percentIncrease*j)),2)-(minX+(percentIncrease*j))/(minY+(percentIncrease*k));
cout<<((result[i] > 0 )?"O":"X");
}else if(menuSelection==3){
result[i]=(0.5 * sin(minX+(percentIncrease*j)))+(0.5 *cos(minY+(percentIncrease*k)));
cout<<((result[i] > 0 )?"O":"X");
}else if(menuSelection==4){
result[i]=(0.5 * sin(minX+(percentIncrease*j)))+(minX+(percentIncrease*j)) * cos(3 * (minY+(percentIncrease*k)));
cout<<((result[i] > 0 )?"O":"X");
}
}//End display choice if
//Increment Array Index
i++;
//cout<<"Bottom of j";
}//End of j loop
cout<<"\n";
//Increment y-values
if(k<graduationVal){
k++;
}
}//End of While
}
int main(){
int menuChoice=-1;
int displaychoice=0;
double distanceFromMinMaxX=4+6;
double distanceFromMinMaxY=12+5;
int graduations=0;
// double precisionX;
// double precisionY;
double pctIncrease;
while(menuChoice!=0){
cerr<<"Select your function\n";
cerr<<"1. sin(x)cos(y)\n";
cerr<<"2. sin(x)+cos^2(x)-x/y\n";
cerr<<"3. 1/2 sin(x) + 1/2 cos(y)\n";
cerr<<"4. 1/2 sin(x) + xcos(3y)\n";
cerr<<"0. Quit\n";
cin>>menuChoice;
if(menuChoice == 0){
return 0;
}
cerr<<"Number of graduations per axis: ";
cin>>graduations;
pctIncrease=1/(double)(graduations - 1);
int values_size=graduations * graduations;
double values[values_size];
/*int yValues[graduationVal];*/
// precisionX=distanceFromMinMaxX/graduations;
// precisionY=distanceFromMinMaxY/graduations;
displayValues(values,values_size,graduations,pctIncrease,menuChoice);
}
}
编辑：
#include <iostream>
#include <cmath>
using namespace std;
double minX=-4;
double maxX=6;
double minY=-12;
double maxY=5;
double* calculateValues(double val[],int val_size,int graduationVal,double xPrecision,double yPrecision,int menuSelection){
/*int displaySelection=0;
cerr<<"(0) Bitmap or (1) Values?";
cin>>displaySelection;*/
int k=0;
int i=0;
//Add Values into array until result-1 values
while(i < val_size){
for(int j=0; j<graduationVal;j++){
if(menuSelection==1){
val[i]=sin(minX+(xPrecision*j))*cos(minY+(yPrecision*k));
}else if(menuSelection==2){
val[i]=sin(minX+(xPrecision*j))+pow(cos(minY+(xPrecision*j)),2)-(minX+(xPrecision*j))/(minY+(yPrecision*k));
}else if(menuSelection==3){
val[i]=(0.5 * sin(minX+(xPrecision*j)))+(0.5 *cos(minY+(yPrecision*k)));
}else if(menuSelection==4){
val[i]=(0.5 * sin(minX+(xPrecision*j)))+(minX+(xPrecision*j)) * cos(3 * (minY+(yPrecision*k)));
}
//Increment Array Index
i++;
}//End of j loop
//Increment y-values
if(k<graduationVal){
k++;
}
}//End of While
return val;
}
void displayValues(double result[],int result_size,int numOfGraduations){
int displaySelection=0;
cerr<<"(0) Bitmap or (1) Values?";
cin>>displaySelection;
int k=0;
int i=0;
while(i< result_size){
for(int j=0;j<numOfGraduations;j++){
if(displaySelection==1){
cout<<result[i]<<" ";
}else{
cout<<((result[i] > 0 )?"O":"X");
}
i++;
}
cout<<"\n";
}
}
int main(){
int menuChoice=-1;
int displaychoice=0;
double distanceFromMinMaxX=4+6;
double distanceFromMinMaxY=12+5;
int graduations=0;
double precisionX;
double precisionY;
double pctIncrease;
while(menuChoice!=0){
cerr<<"Select your function\n";
cerr<<"1. sin(x)cos(y)\n";
cerr<<"2. sin(x)+cos^2(x)-x/y\n";
cerr<<"3. 1/2 sin(x) + 1/2 cos(y)\n";
cerr<<"4. 1/2 sin(x) + xcos(3y)\n";
cerr<<"0. Quit\n";
cin>>menuChoice;
if(menuChoice == 0){
return 0;
}
cerr<<"Number of graduations per axis: ";
cin>>graduations;
pctIncrease=1/(double)(graduations - 1);
int values_size=graduations * graduations;
double values[values_size];
/*int yValues[graduationVal];*/
precisionX=distanceFromMinMaxX/graduations;
precisionY=distanceFromMinMaxY/graduations;
/*cout << "# of graduations: " << graduations << endl;
cout << "Precision: "<< endl;
cout << "x: " << precisionX << endl;
cout << "y: " << precisionY << endl;*/
calculateValues(values,values_size,graduations,precisionX,precisionY,menuChoice);
displayValues(values,values_size,graduations);
}
}
编辑：我正在使用gcc
答案 0 :(得分：0)
这会产生类似于您链接的screencap的输出（用户选择选项2）。 TextPlot2d函数采用lambda或functor计算所需的函数，以及两个PlotRange结构，用于指定x和y轴应如何缩放。我也使用不同的输出字符，因为我很难区分＆＃39; X＆＃39;与＆＃39; O＆＃39;。
#include <iostream>
#include <cmath>
struct PlotRange {
double begin, end, count;
double get_step() const { return (end - begin) / count; }
};
template <typename F>
void TextPlot2d(F func, PlotRange range_x, PlotRange range_y) {
const auto step_x = range_x.get_step();
const auto step_y = range_y.get_step();
// multiply steps by iterated integer
// to avoid accumulation of error in x and y
for(int j = 0;; ++j) {
auto y = range_y.begin + step_y * j;
if(y >= range_y.end) break;
for(int i = 0;; ++i) {
auto x = range_x.begin + step_x * i;
if(x >= range_x.end) break;
auto z = func(x, y);
if(z != z) { std::cout << '?'; } // NaN outputs a '?'
else { std::cout << (z < 0 ? '#':'o'); }
}
std::cout << '\n';
}
}
int main() {
TextPlot2d(
[](double x, double y){ return std::sin(x) + std::cos(y/2)*std::cos(y/2) - x/y; },
{-4.0, 6.0, 40.0},
{-12.0, 5.0, 40.0}
);
}
多田！
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oooooo#######ooooooooooooooooooooooooooo
ooooo#########oooooooooooooooooooooooooo
oooo###########ooooooooooooooooo######oo
ooo#############ooooooooooooooo#######oo
ooo#############ooooooooooooooo########o
oo##############ooooooooooooooo########o
ooo#############ooooooooooooooo########o
ooo#############oooooooooooooooo######oo
oooo###########oooooooooooooooooo####ooo
ooooo#########oooooooooooooooooooooooooo
ooooo#########oooooooooooooooooooooooooo
oooooo#######ooooooooooooooooooooooooooo
ooooooo######ooooooooooooooooooooooooooo
oooooo#######ooooooooooooooooooooooooooo
oooooo#######ooooooooooooooooooooooooooo
ooooo#########oooooooooooooooooooooooooo
ooo############ooooooooooooooooooooooooo
oo#############ooooooooooooooooooooooooo
################oooooooooooooooooooooooo
################oooooooooooooooooooooooo
################oooooooooooooooooooooooo
################oooooooooooooooooooooooo
################oooooooooooooooooooooooo
###############ooooooooooooooooooooooooo
###############ooooooooooooooooooooooooo
###############ooooooooooooooooooooooooo
###############ooooooooooooooooooooooooo
################oooooooooooooooooooooooo
oooooooooooooooooo######################
oooooooooooooooooooooo##################
oooooooooooooooooooooooo################
ooooooooooooooooooooooooo###############
ooooooooooo###ooooooooooo###############
ooooooooo#######ooooooooo###############
oooooooo########oooooooooo##############
ooooooo#########oooooooooo##############
ooooooo#########ooooooooooo#############
ooooooo########oooooooooooo#############
oooooooo######oooooooooooooo############
答案 1 :(得分：0)
我终于得到了输出!!看起来功能＃2错了，这就是我没有得到正确答案的原因。
#include <iostream>
#include <cmath>
using namespace std;
double minX=-4;
double maxX=6;
double minY=-12;
double maxY=5;
void calculateValues(double val[],int val_size,int graduationVal,double xPrecision,double yPrecision,int menuSelection){
/*int displaySelection=0;
cerr<<"(0) Bitmap or (1) Values?";
cin>>displaySelection;*/
//double val[];
int k=0;
int i=0;
//Add Values into array until result-1 values
while(i < val_size){
for(int j=0; j<graduationVal;j++){
if(menuSelection==1){
val[i]=sin(minX+(xPrecision*j))*cos(minY+(yPrecision*k));
}else if(menuSelection==2){
val[i]=sin(minX+(xPrecision*j))+pow(cos((minY+(yPrecision*k))/2),2)-(minX+(xPrecision*j))/(minY+(yPrecision*k));
}else if(menuSelection==3){
val[i]=(0.5 * sin(minX+(xPrecision*j)))+(0.5 *cos(minY+(yPrecision*k)));
}else if(menuSelection==4){
val[i]=(0.5 * sin(minX+(xPrecision*j)))+(minX+(xPrecision*j)) * cos(3 * (minY+(yPrecision*k)));
}
//Go to next value in array
i++;
}//End of j loop
//Increment y-values
if(k<graduationVal){
k++;
}
}//End of While
}
void displayValues(double result[],int result_size,int numOfGraduations){
int displaySelection=0;
cerr<<"(0) Bitmap or (1) Values?";
cin>>displaySelection;
int k=0;
int i=0;
while(i< result_size){
for(int j=0;j<numOfGraduations;j++){
if(displaySelection==1){
cout<<result[i]<<" ";
}else{
cout<<((result[i] > 0 )?"O":"#");
}
i++;
}
cout<<"\n";
}
}
int main(){
int menuChoice=-1;
int displaychoice=0;
double distanceFromMinMaxX=maxX-minX;
double distanceFromMinMaxY=maxY-minY;
int graduations=0;
double precisionX;
double precisionY;
double pctIncrease;
while(menuChoice!=0){
cerr<<"Select your function\n";
cerr<<"1. sin(x)cos(y)\n";
cerr<<"2. sin(x)+cos^2(y/2)-x/y\n";
cerr<<"3. 1/2 sin(x) + 1/2 cos(y)\n";
cerr<<"4. 1/2 sin(x) + xcos(3y)\n";
cerr<<"0. Quit\n";
cin>>menuChoice;
if(menuChoice == 0){
return 0;
}
cerr<<"Number of graduations per axis: ";
cin>>graduations;
//pctIncrease=1/(double)(graduations - 1);
int values_size=graduations * graduations;
double values[values_size];
/*int yValues[graduationVal];*/
precisionX=(distanceFromMinMaxX)/graduations;
precisionY=(distanceFromMinMaxY)/graduations;
/*cout << "# of graduations: " << graduations << endl;
cout << "Precision: "<< endl;
cout << "x: " << precisionX << endl;
cout << "y: " << precisionY << endl;*/
calculateValues(values,values_size,graduations,precisionX,precisionY,menuChoice);
displayValues(values,values_size,graduations);
}
}