【发布时间】：2016-10-13 22:26:11
【问题描述】：
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触发函数。所有函数的范围都在 [-4..6] 和 [-12...5] 之间Y.下一个用户将被允许选择刻度的数量（或限制的 x 和 y 范围之间的值）以及他们是否想查看结果值或位图。最终输出将在值/位图中。我已粘贴 wolfram alpha 链接对于 cmets 中的函数。
我所做的是将 2D 输出中的每一列按 1/(graduation-1)（即，如果分级值为 4，则为 1/3）和列 # 的乘积递增。一旦乘积达到 1，我就不会正确output 的值。
#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
【问题讨论】：
-
“我仍然没有得到想要的输出。”描述你想要的输出会很有帮助。
-
嗨。我已经为我想要获得的输出添加了一张图片，但它不起作用。
-
您链接的图像并没有告诉我任何事情。使用文字。
-
哦，你想要一个 xy 图。你为什么不这么说？你的问题会更简单：“我正在为我计算的 X-es 计算一些 Y 值，我在将结果组织为 ASCII X-Y 图时遇到了困难。”建议：将用于计算您的值的代码与处理显示的代码分开。代码将变得更清晰，更易于管理 - 目前
displayValues做了一些难以描述的事情。 -
好的！我已经分离了代码，但是当我尝试将从 calculateValues 函数返回的数组存储到 values 数组时出现错误。
标签： c++ math bitmap trigonometry gedit