fixed broken code in new presets

src/lib/autoPresets.js

@@ -682,8 +682,18 @@ vec2 get_velocity(vec2 p) {
     "cy": -1.6277,
     "w": 30.2937,
     "h": 30.2937,
-    "code": `v.x = length(p)*min(sin(p.y),cos(p.x));
-v.y = cos((p.y+p.y));`
+    "code": `// p.x and p.y are current coordinates
+// v.x and v.y is a velocity at point p
+vec2 get_velocity(vec2 p) {
+  vec2 v = vec2(0., 0.);
+
+  // change this to get a new vector field
+  v.x = length(p)*min(sin(p.y),cos(p.x));
+v.y = cos((p.y+p.y));
+
+
+  return v;
+}`
   },
   {
     "name": "README 2",
@@ -695,8 +705,18 @@ v.y = cos((p.y+p.y));`
     "cy": -1.62765,
     "w": 30.2937,
     "h": 30.2937,
-    "code": `v.x = cos(p.y);
-v.y = cos(p.x);`
+    "code": `// p.x and p.y are current coordinates
+// v.x and v.y is a velocity at point p
+vec2 get_velocity(vec2 p) {
+  vec2 v = vec2(0., 0.);
+
+  // change this to get a new vector field
+  v.x = cos(p.y);
+v.y = cos(p.x);
+
+
+  return v;
+}`
   },
   {
     "name": "README 3",
@@ -708,8 +728,18 @@ v.y = cos(p.x);`
     "cy": -0.7710999999999997,
     "w": 55.970200000000006,
     "h": 55.970200000000006,
-    "code": `v.x = min(sin(exp(p.x)),sin(length(p)));
-v.y = sin(p.x);`
+    "code": `// p.x and p.y are current coordinates
+// v.x and v.y is a velocity at point p
+vec2 get_velocity(vec2 p) {
+  vec2 v = vec2(0., 0.);
+
+  // change this to get a new vector field
+  v.x = min(sin(exp(p.x)),sin(length(p)));
+v.y = sin(p.x);
+
+
+  return v;
+}`
   },
   {
     "name": "README 4",
@@ -721,8 +751,18 @@ v.y = sin(p.x);`
     "cy": -1.1695,
     "w": 11.4385,
     "h": 11.4385,
-    "code": `v.x = (p.y+cos(p.y));
-v.y = sin(min(length(p),log((p.y+p.x))*p.x));`
+    "code": `// p.x and p.y are current coordinates
+// v.x and v.y is a velocity at point p
+vec2 get_velocity(vec2 p) {
+  vec2 v = vec2(0., 0.);
+
+  // change this to get a new vector field
+  v.x = (p.y+cos(p.y));
+v.y = sin(min(length(p),log((p.y+p.x))*p.x));
+
+
+  return v;
+}`
   },
   {
     "name": "True Dipole",
@@ -734,12 +774,21 @@ v.y = sin(min(length(p),log((p.y+p.x))*p.x));`
     "cy": 0,
     "w": 8.5398,
     "h": 8.5398,
-    "code": `float x = p.x;
+    "code": `// p.x and p.y are current coordinates
+// v.x and v.y is a velocity at point p
+vec2 get_velocity(vec2 p) {
+  vec2 v = vec2(0., 0.);
+
+  // change this to get a new vector field
+  float x = p.x;
 float y = p.y;
 
 // true dipole
 v.x = 2.0*x*y;
-v.y = y*y - x*x;`
+v.y = y*y - x*x;
+
+  return v;
+}`
   },
   {
     "name": "Flow profile of a sphere",
@@ -751,7 +800,13 @@ v.y = y*y - x*x;`
     "cy": -0.11769999999999992,
     "w": 11.434999999999999,
     "h": 11.434999999999999,
-    "code": `float x = p.x;
+    "code": `// p.x and p.y are current coordinates
+// v.x and v.y is a velocity at point p
+vec2 get_velocity(vec2 p) {
+  vec2 v = vec2(0., 0.);
+
+  // change this to get a new vector field
+  float x = p.x;
 float y = p.y;
 float r = sqrt(x*x+y*y);
 float sinth = y/r;
@@ -764,7 +819,10 @@ float ur = Uinf*(1.-1.5*R/r+0.5*R*R*R/(r*r*r))*costh;
 float uth = Uinf*(-1.+0.75*R/r+0.25*R*R*R/(r*r*r))*sinth;
 // to ux uy
 v.x = costh*ur-sinth*uth;
-v.y = sinth*ur+costh*uth;`,
+v.y = sinth*ur+costh*uth;
+
+  return v;
+}`,
     "particleCount": 7000
   },
   {
@@ -774,13 +832,22 @@ v.y = sinth*ur+costh*uth;`,
     "cy": -0.9834499999999995,
     "w": 96.8415,
     "h": 96.8415,
-    "code": `float r = length(p);
+    "code": `// p.x and p.y are current coordinates
+// v.x and v.y is a velocity at point p
+vec2 get_velocity(vec2 p) {
+  vec2 v = vec2(0., 0.);
+
+  // change this to get a new vector field
+  float r = length(p);
 float theta = atan(p.y, p.x);
 v = vec2(p.y, -p.x) / r;
 float t = sqrt(r * 10.) + theta + frame * .02;
 v *= sin(t);
 v *= length(v) * 10.;
-v += p * .2;`,
+v += p * .2;
+
+  return v;
+}`,
     "timeStep": 0.01,
     "fadeOut": 0.9,
     "dropProbability": 0.009,
@@ -796,9 +863,18 @@ v += p * .2;`,
     "cy": 0.3591500000000001,
     "w": 8.5397,
     "h": 8.5397,
-    "code": `float a = .1;
+    "code": `// p.x and p.y are current coordinates
+// v.x and v.y is a velocity at point p
+vec2 get_velocity(vec2 p) {
+  vec2 v = vec2(0., 0.);
+
+  // change this to get a new vector field
+  float a = .1;
 float r2 = p.x * p.x + p.y * p.y;
-v = vec2(p.y, -p.x) / r2 - a * p;`
+v = vec2(p.y, -p.x) / r2 - a * p;
+
+  return v;
+}`
   },
   {
     "name": "Julia set",
@@ -810,13 +886,23 @@ v = vec2(p.y, -p.x) / r2 - a * p;`
     "cy": -0.01795000000000002,
     "w": 5.0845,
     "h": 5.0845,
-    "code": `vec2 c = p;
+    "code": `// p.x and p.y are current coordinates
+// v.x and v.y is a velocity at point p
+vec2 get_velocity(vec2 p) {
+  vec2 v = vec2(0., 0.);
+
+  // change this to get a new vector field
+  vec2 c = p;
 vec2 z = vec2(.4, .5);
 for (int i = 0; i < 8; i++) {
    c = vec2(c.x * c.x - c.y * c.y, c.y * c.x + c.x * c.y);
    c += z;
 }
-v = c;`,
+v = c;
+
+
+  return v;
+}`,
     "particleCount": 10000
   },
   {
@@ -829,14 +915,26 @@ v = c;`,
     "cy": -0.07015000000000005,
     "w": 4.9902,
     "h": 4.9902,
-    "code": `vec2 z = p;
+    "code": `// p.x and p.y are current coordinates
+// v.x and v.y is a velocity at point p
+vec2 get_velocity(vec2 p) {
+  vec2 v = vec2(0., 0.);
+
+  // change this to get a new vector field
+  vec2 z = p;
 for(int k=0; k<50; k++) {
 z = vec2(z.x * z.x - z.y * z.y, 2. * z.x * z.y) + p;
 }
 
 float mask = step(length(z), 2.);
 v.x = -p.y/length(p) * (0.5 - mask);
-v.y = p.x/length(p) * (0.5 - mask);`,
+v.y = p.x/length(p) * (0.5 - mask);
+
+
+
+
+  return v;
+}`,
     "particleCount": 30000
   },
   {
@@ -849,8 +947,17 @@ v.y = p.x/length(p) * (0.5 - mask);`,
     "cy": 0,
     "w": 8.5398,
     "h": 8.5398,
-    "code": `v.x = sin(5.0*p.y + p.x);
-v.y = cos(5.0*p.x - p.y);`
+    "code": `// p.x and p.y are current coordinates
+// v.x and v.y is a velocity at point p
+vec2 get_velocity(vec2 p) {
+  vec2 v = vec2(0., 0.);
+
+  // change this to get a new vector field
+  v.x = sin(5.0*p.y + p.x);
+v.y = cos(5.0*p.x - p.y);
+
+  return v;
+}`
   },
   {
     "name": "Shear zone",
@@ -862,14 +969,24 @@ v.y = cos(5.0*p.x - p.y);`
     "cy": 0,
     "w": 8.539734222673566,
     "h": 8.539734222673566,
-    "code": `float r = length(p) - 1.5;
+    "code": `// p.x and p.y are current coordinates
+// v.x and v.y is a velocity at point p
+vec2 get_velocity(vec2 p) {
+  vec2 v = vec2(0., 0.);
+
+  // change this to get a new vector field
+  float r = length(p) - 1.5;
 float c = 1.0/(1.0+exp(-5.0*r));
 float vx1 = -p.y,  // circle
       vy1 = p.x;
 float vx2 = 0.2*p.x+p.y, // spiral
       vy2 = 0.2*p.y-p.x;
 v.x = c*vx1 + (1.0-c)*vx2;
-v.y = c*vy1 + (1.0-c)*vy2;`
+v.y = c*vy1 + (1.0-c)*vy2;
+
+
+  return v;
+}`
   },
   {
     "name": "Beautiful field",
@@ -881,14 +998,23 @@ v.y = c*vy1 + (1.0-c)*vy2;`
     "cy": -0.36424999999999974,
     "w": 24.7317,
     "h": 24.7317,
-    "code": `float dt = 0.01;
+    "code": `// p.x and p.y are current coordinates
+// v.x and v.y is a velocity at point p
+vec2 get_velocity(vec2 p) {
+  vec2 v = vec2(0., 0.);
+
+  // change this to get a new vector field
+  float dt = 0.01;
 float t = frame*dt;
 float w = 2.*PI/5.;
 float A = 2.;
 
 float d = sqrt(p.x*p.x + p.y*p.y);
 v.x = A*cos(w*t/d);
-v.y = A*sin(w*t/d);`,
+v.y = A*sin(w*t/d);
+
+  return v;
+}`,
     "particleCount": 3000
   }
 ];