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///////////////////////////////////////////////////////////////////////////////////////////////////
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// Copyright 2020 Leszek Koltunski //
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// //
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// This file is part of Magic Cube. //
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// //
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// Magic Cube is proprietary software licensed under an EULA which you should have received //
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// along with the code. If not, check https://distorted.org/magic/License-Magic-Cube.html //
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///////////////////////////////////////////////////////////////////////////////////////////////////
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package org.distorted.objectlib.touchcontrol;
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import static org.distorted.objectlib.main.TwistyObject.SQ5;
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import org.distorted.library.type.Static3D;
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import org.distorted.objectlib.main.TwistyObject;
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///////////////////////////////////////////////////////////////////////////////////////////////////
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// Dodecahedral objects: map the 2D swipes of user's fingers to 3D rotations
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public class TouchControlDodecahedron extends TouchControlShapeConstant
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{
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public static final float C2 = (SQ5+3)/4;
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public static final float LEN = (float)(Math.sqrt(1.25f+0.5f*SQ5));
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public static final float SIN54 = (SQ5+1)/4;
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public static final float COS54 = (float)(Math.sqrt(10-2*SQ5)/4);
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public static final float DIST3D = (float)Math.sqrt(0.625f+0.275f*SQ5);
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public static final float DIST2D = (SIN54/COS54)/2;
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public static final float[] D3D = { DIST3D,DIST3D,DIST3D,DIST3D,DIST3D,DIST3D,
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DIST3D,DIST3D,DIST3D,DIST3D,DIST3D,DIST3D };
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public static final Static3D[] FACE_AXIS = new Static3D[]
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{
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new Static3D( C2/LEN, SIN54/LEN, 0 ),
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new Static3D( C2/LEN,-SIN54/LEN, 0 ),
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new Static3D( -C2/LEN, SIN54/LEN, 0 ),
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new Static3D( -C2/LEN,-SIN54/LEN, 0 ),
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new Static3D( 0 , C2/LEN, SIN54/LEN ),
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new Static3D( 0 , C2/LEN,-SIN54/LEN ),
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new Static3D( 0 , -C2/LEN, SIN54/LEN ),
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new Static3D( 0 , -C2/LEN,-SIN54/LEN ),
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new Static3D( SIN54/LEN, 0 , C2/LEN ),
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new Static3D( SIN54/LEN, 0 , -C2/LEN ),
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new Static3D(-SIN54/LEN, 0 , C2/LEN ),
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new Static3D(-SIN54/LEN, 0 , -C2/LEN )
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};
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///////////////////////////////////////////////////////////////////////////////////////////////////
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public TouchControlDodecahedron(TwistyObject object)
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{
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super(object,D3D,FACE_AXIS);
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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// return angle (in radians) that the line connecting the center C of the pentagonal face and the
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// first vertex of the pentagon makes with a vertical line coming upwards from the center C.
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private float returnAngle(int face)
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{
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switch(face)
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{
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case 0:
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case 2:
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case 6:
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case 7: return 0.0f;
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case 1:
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case 3:
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case 4:
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case 5: return (float)(36*Math.PI/180);
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case 9:
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case 10: return (float)(54*Math.PI/180);
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case 8:
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case 11: return (float)(18*Math.PI/180);
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}
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return 0.0f;
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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// The pair (distance,angle) defines a point P in R^2 in polar coordinate system. Let V be the vector
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// from the center of the coordinate system to P.
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// Let P' be the point defined by polar (distance,angle+PI/2). Let Lh be the half-line starting at
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// P' and going in the direction of V.
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// Return true iff point 'point' lies on the left of Lh, i.e. when we rotate (using the center of
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// the coordinate system as the center of rotation) 'point' and Lh in such a way that Lh points
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// directly upwards, is 'point' on the left or the right of it?
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private boolean isOnTheLeft(float[] point, float distance, float angle)
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{
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float sin = (float)Math.sin(angle);
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float cos = (float)Math.cos(angle);
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float vx = point[0] + sin*distance;
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float vy = point[1] - cos*distance;
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return vx*sin < vy*cos;
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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int returnPart(int type, int face, float[] point)
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{
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switch(type)
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{
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case TYPE_NOT_SPLIT : return 0;
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case TYPE_SPLIT_EDGE : return partEdge(point,face);
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case TYPE_SPLIT_EDGE_COIN: float y = point[1];
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float x = point[0];
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float dist = D_PENTA*DIST2D;
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return partEdge(point,face) + (x*x+y*y < dist*dist ? 0:5 );
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case TYPE_SPLIT_CORNER : // not supported
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}
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return 0;
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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// Return 0,1,2,3,4 - the vertex of the pentagon to which point 'point' is the closest, if the
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// 'point' is inside the pentagon - or -1 otherwise.
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// The 'first' vertex is the one we meet the first when we rotate clockwise starting from 12:00.
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// This vertex makes angle 'returnAngle()' with the line coming out upwards from the center of the
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// pentagon.
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// Distance from the center to a vertex of the pentagon = 1/(6*COS54)
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private int partEdge(float[] point, int face)
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{
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float angle = returnAngle(face);
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float A = (float)(Math.PI/5);
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for(int i=0; i<5; i++)
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{
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if( isOnTheLeft(point, DIST2D, (9-2*i)*A-angle) ) return -1;
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}
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if( isOnTheLeft(point, 0, 2.5f*A-angle) )
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{
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if( isOnTheLeft(point, 0, 3.5f*A-angle) )
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{
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return isOnTheLeft(point, 0, 5.5f*A-angle) ? 3 : 4;
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}
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else return 0;
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}
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else
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{
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if( isOnTheLeft(point, 0, 4.5f*A-angle) )
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{
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return 2;
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}
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else
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{
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return isOnTheLeft(point, 0, 6.5f*A-angle) ? 1 : 0;
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}
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}
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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boolean isInsideFace(int face, float[] p)
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{
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float angle = returnAngle(face);
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float A = (float)(Math.PI/5);
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for(int i=0; i<5; i++)
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{
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if( isOnTheLeft(p, DIST2D, (9-2*i)*A-angle) ) return false;
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}
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return true;
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}
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}
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