Example CollideCheck

class CollideCheck extends hxd.App {

  static var RW = 100;
  static var RH = 30;

  var rrect : h2d.Graphics;
  var line : h2d.Graphics;

  override function init() {
    var size = RW - RH;
    var k = 10;
    rrect = new h2d.Graphics(s2d);

    rrect.beginFill(0xFFFFFFFF);
    for( i in 0...k+1 ) {
      var a = Math.PI * i / k - Math.PI / 2;
      rrect.lineTo(size + RH * Math.cos(a), RH * Math.sin(a));
    }
    for( i in 0...k+1 ) {
      var a = Math.PI * i / k + Math.PI / 2;
      rrect.lineTo(-size + RH * Math.cos(a), RH * Math.sin(a));
    }
    rrect.endFill();

    rrect.x = s2d.width >> 1;
    rrect.y = s2d.height >> 1;
    rrect.rotation = Math.PI / 3;

    line = new h2d.Graphics(s2d);
    line.beginFill(0xFFFFFFFF);
    line.drawRect(0, -0.5, 100, 1);
    line.endFill();

    //var r = new h2d.col.RoundRect(rrect.x, rrect.y, RW, RH, rrect.rotation);
    //mapCol( function(pt) return r.distance(pt) );
  }

  function mapCol( dist : h2d.col.Point -> Float, scale = 1. ) {
    var pt = new h2d.col.Point();
    var bmp = hxd.Pixels.alloc(s2d.width, s2d.height, BGRA);
    for( x in 0...bmp.width )
      for( y in 0...bmp.height ) {
        pt.x = x + 0.5;
        pt.y = y + 0.5;
        var d = dist(pt);
        if( d < 0 ) {
          var c = Std.int( -d * scale * 4 + 0x20 );
          if( c > 0xFF ) c = 0xFF;
          bmp.setPixel(x, y, 0xFF000000 | (c << 16));
        } else {
          var c = Std.int( d * scale );
          if( c > 0xFF ) c = 0xFF;
          bmp.setPixel(x, y, 0xFF000000 | c);
        }
      }
    var view = new h2d.Bitmap(h2d.Tile.fromPixels(bmp));
    view.alpha = 0.5;
    s2d.add(view, 0);
    bmp.dispose();
  }

  override function update(dt:Float) {
    var px = s2d.mouseX;
    var py = s2d.mouseY;

    var r = new h2d.col.RoundRect(rrect.x, rrect.y, RW * 2, RH * 2, rrect.rotation);
    var pt = new h2d.col.Point(px, py);

    rrect.rotation += 0.002;
    rrect.color.set(0, 0, 1);

    line.x = px;
    line.y = py;
    var n = r.getNormalAt(pt);
    line.rotation = Math.atan2(n.y, n.x);

    if( r.inside(pt) )
      rrect.color.set(0, 1, 0);
  }

  static function main() {
    new CollideCheck();
  }

}

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