## c ++ – Attempting to draw sf :: text into the window crashes

When I was reviewing my older SFML projects (2-3 months old) to see if I could recompile them to get an updated executable file, I noticed that any program that used sf :: text was triggered a specific error. After I closed the window, an exception was thrown and Visual Studio opened an additional "xmemory" tab, with the exception appearing on line 1311. Apparently, something in my code caused the function "inline void _Container_base12 :: _ orphan_all ()". With this simple example I will illustrate the problem I have.

``````int main() {

RenderWindow window(VideoMode(600, 600), "halp pls", Style::Close | Style::Titlebar);
Font font;

Text t("Darien", font);

while (window.isOpen()) {
Event e;
while (window.pollEvent(e)){
if (e.type == Event::Closed)
window.close();
}

window.clear();
window.draw(t);//This is where the error occurred!
window.display();
}
}
``````

If I leave out `window.draw(t)`The program runs fine, but of course I have to be able to draw texts on the screen to continue my SFML projects. I am not sure if this is a problem with the code, SFML (I have the most recent, 2.5.1), Visual Studio or any other unknown. At this point, I ran out of ideas: /

## Parametric Functions – Draw a NDEigensystem solution over a helicoid

I'm trying to draw the solutions of a particular Hamiltonian eigensystem over a helicoid. In other words, my solutions are a function of the radial variables (r,$$phi$$). The helicoid results from the parameterization: (r cos (a$$phi$$), sin (a$$phi$$) $$phi$$).

How do I display the solutions over the helicoid as a heatmap or something? The problem with Plot3D is that the variables are treated as (x, y) coordinates. Does RegionFunction help in this case?

The solutions have the form {funs, vals}, where funs is the list of all eigenfunctions.

## html – How to draw an SVG on canvas with javascript?

How can I draw this svg on a canvas with javascript?

``````

Sorry, your browser does not support inline SVG.
``````

Note: Answers in this and that post will only provide a solution if you have an external SVG. My requirement is to draw several SVGs on canvas (or anything else) with variable X, Y, radius and color

## How to draw this shape with better logic?

``````#include

using namespace std;

int main() {
/**
*
* *
*   *
*     *
*       *
*         *
*************
*/
int spaces_before = 6; // spaces before printing the stars
int spaces_after = 0; // spaces after printing the first star
int stars = 1;
for (int i = 1; i <= 7; i++) {
for (int j = 1; j <= spaces_before; j++) {
cout << ' ';
}
if (i == 1) {
cout << "*";
} else if (i != 7) {
cout << '*';
for (int j = 1; j <= spaces_after; j++) {
cout << ' ';
}
cout << '*';
} else {
for (int j = 1; j <= stars; j++) {
cout << '*';
}
}
spaces_before--;
if (i == 1) {
spaces_after++;
} else {
spaces_after += 2;
}
cout << 'n';
stars += 2;
}
}
``````

I am a beginner in C ++ and have received this task from my teacher. I tried that and basically it works, but I doubt that my code is not easy. There is an easier way. How can I make my code easier? Notes are welcome.

## Draw gamma function manually

I tried to manually draw the gamma function in Mathematica with the following sequence:

``````F(x_):=NIntegrate(t^(x-1)*Exp(-t),{t,0,Infinity})
Plot(F(x),{x,-5,5})
``````

But unfortunately it does not work. Where did I make a mistake?

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## Draw – How to draw a multi-valued function in \$ mathbb {R} ^ 2 \$ with Mathematica?

First, consider the cubic equation
$$x ^ 3 + a = x.$$

Mathematica makes it easy to find real solutions to the above equation.

``````F(a_):= Solve(x^3 + a == x , x, Reals)
``````

Now I want to draw the graph of the multi-valued function $$G: (-1,1) to 2 ^ mathbb {R}$$
$$a mapsto { text {the real solutions of} x ^ 3 + a = x },$$
i.e. the sentence

$$text {Graf} (G): = {(x, y); x in (-1,1) text {and} y in G (x) }.$$

Can someone help me?

## How to draw a circle in a view [on hold]

I have some custom queries from the database and I want to show that in a view within a circle. like this:

Is there a module to do that, if not, how do you implement this?

## Plotting – How to draw a cross-section of a ParametricPlot3D?

I'm drawing a surface with ParametricPlot3D. Ideally, I would like to draw an intersection of the surface with a plane, as shown in another question (cross sections or slices of 3D figures – Mathematica). In my case, however, the parameters u and v do not correspond to the space coordinates x, y. Because of this, I used RegionPlot instead of CountourPlot to draw all pairs (x, y) that intersect the surface for a given value of z. It does not work and I'm lost trying to find alternatives.

``````Surface(u_, v_) = {Cos(u), Sin(u) + Cos(v), Sin(v)};

Row({Show({ParametricPlot3D(
Surface(u, v), {u, 0, 2Pi}, {v, -Pi, Pi},
PlotStyle -> Opacity( 0.2)),
Graphics3D({Blue, Opacity(0.4),
InfinitePlane({0, 0, 0}, {{1, 0, 0}, {0, 1, 0}})})},
ImageSize -> 300),
RegionPlot(
Exists({u, v}, Surface(u, v) == {x, y, 0}), {x, -1, 1}, {y, -1, 1},
ImageSize -> 300)})
``````

In fact, my interface is a bit more complicated, so I chose a simple one to ask that question. Ideally, later on, I want to be able to change the normal vector of the plane by checking any angle of the cross section. So please remember that when you think about the question.
Thank you for every commitment in my problem!