boboboa32

- (IBAction)showHideView:(id)sender
{
    // Fade out the view right away
    [UIView animateWithDuration:1.0
        delay: 0.0
        options: UIViewAnimationOptionCurveEaseIn
        animations:^{
             thirdView.alpha = 0.0;
        }
        completion:^(BOOL finished){

boboboa32

NSArray *stringsArray = @[ @"string 1",
                           @"String 21",
                           @"string 12",
                           @"String 11",
                           @"String 02" ];
 
static NSStringCompareOptions comparisonOptions = NSCaseInsensitiveSearch | NSNumericSearch |
        NSWidthInsensitiveSearch | NSForcedOrderingSearch;
NSLocale *currentLocale = [NSLocale currentLocale];
 

boboboa32

int multiplier = 7;
int (^myBlock)(int) = ^(int num) {
    return num * multiplier;
};
 
printf("%d", myBlock(3)); // prints "21"

boboboa32

int pnpoly(int nvert, float *vertx, float *verty, float testx, float testy) {
  int i, j, c = 0;
  for (i = 0, j = nvert-1; i < nvert; j = i++) {
    if ( ((verty[i]>testy) != (verty[j]>testy)) && (testx < (vertx[j]-vertx[i]) * (testy-verty[i]) / (verty[j]-verty[i]) + vertx[i]) )
       c = !c;
  }
  return c;
}

boboboa32

polygon a = Polygon(4, v(0,0),v(0,3),v(3,3),v(3,0)), b = Polygon(4, v(4,4),v(4,6),v(6,6),v(6,4));
printf("%d\n", sat(a,b)); // false

a = Polygon(4, v(0,0),v(0,5),v(5,4),v(3,0));  b = Polygon(4, v(4,4),v(4,6),v(6,6),v(6,4));
printf("%d\n", sat(a,b)); // true

boboboa32

a = polygon{v(0,0),v(0,5),v(5,4),v(3,0)}
b = polygon{v(4,4),v(4,6),v(6,6),v(6,4)}

print(sat(a,b)) -- true

boboboa32

int sat(polygon a, polygon b){
    int i;
    for (i=0;i<a.n;i++){
        vec axis = a.edges[i].dir; // Get the direction vector
        axis = perp(axis); // Get the normal of the vector (90 degrees)
        float *a_ = project(a,axis), *b_ = project(b,axis); // Find the projection of a and b onto axis
        if (!overlap(a_,b_)) return 0; // If they do not overlap, then no collision
    }

    for (i=0;i<b.n;i++){ // repeat for b

boboboa32

function sat(a, b)
    for i,v in ipairs(a.edges) do
        local axis = perp(v)
        local a_, b_ = project(a, axis), project(b, axis)
        if not overlap(a_, b_) then return false end
    end
    for i,v in ipairs(b.edges) do
        local axis = perp(v)
        local a_, b_ = project(a, axis), project(b, axis)
        if not overlap(a_, b_) then return false end

boboboa32

float* project(polygon a, vec axis){
    axis = normalize(axis);
    int i;
    float min = dot(a.vertices[0],axis); float max = min; // min and max are the start and finish points
    for (i=0;i<a.n;i++){
        float proj = dot(a.vertices[i],axis); // find the projection of every point on the polygon onto the line.
        if (proj < min) min = proj; if (proj > max) max = proj;
    }
    float* arr = (float*)malloc(2*sizeof(float));
    arr[0] = min; arr[1] = max;

boboboa32

-- We keep a running range (min and max) values of the projection, and then use that as our shadow

function project(a, axis)
    axis = normalize(axis)
    local min = dot(a.vertices[1],axis)
    local max = min
    for i,v in ipairs(a.vertices) do
        local proj =  dot(v, axis) -- projection
        if proj < min then min = proj end
        if proj > max then max = proj end