Unity GL circle, unitygl circle

Unity GL circle, unitygl circle

In Unity, GL has no circular function and can only be used by itself.

I am also very happy to help you.

Although there is no circle function, but can draw a straight line, using this, with calculus or something, can be drawn. It is a straight line that spends a lot of connections. When each line is short enough, it will be round enough.

1 void DrawCircle (float x, float y, float z, float r, float accuracy) 2 {3 GL. pushMatrix (); 4 // draw 2D image 5 GL. loadOrtho (); 6 7 float stride = r * accuracy; 8 float size = 1/accuracy; 9 float x1 = x, x2 = x, y1 = 0, y2 = 0; 10 float x3 = x, x4 = x, y3 = 0, y4 = 0; 11 12 double squareDe; 13 squareDe = r * r-Math. pow (x-x1, 2); 14 squareDe = squareDe> 0? SquareDe: 0; 15 y1 = (float) (y + Math. sqrt (squareDe); 16 squareDe = r * r-Math. pow (x-x1, 2); 17 squareDe = squareDe> 0? SquareDe: 0; 18 y2 = (float) (y-Math. sqrt (squareDe); 19 for (int I = 0; I <size; I ++) {20x3 = x1 + stride; 21x4 = x2-stride; 22 squareDe = r * r-Math. pow (x-x3, 2); 23 squareDe = squareDe> 0? SquareDe: 0; 24 y3 = (float) (y + Math. sqrt (squareDe); 25 squareDe = r * r-Math. pow (x-x4, 2); 26 squareDe = squareDe> 0? SquareDe: 0; 27 y4 = (float) (y-Math. sqrt (squareDe); 28 29 // draw a line segment 30 GL. begin (GL. LINES); 31 GL. color (Color. blue); 32 GL. vertex (new Vector3 (x1/Screen. width, y1/Screen. height, z); 33 GL. vertex (new Vector3 (x3/Screen. width, y3/Screen. height, z); 34 GL. end (); 35 GL. begin (GL. LINES); 36 GL. color (Color. blue); 37 GL. vertex (new Vector3 (x2/Screen. width, y1/Screen. height, z); 38 GL. vertex (new Vector3 (x4/Screen. width, y3/Screen. height, z); 39 GL. end (); 40 GL. begin (GL. LINES); 41 GL. color (Color. blue); 42 GL. vertex (new Vector3 (x1/Screen. width, y2/Screen. height, z); 43 GL. vertex (new Vector3 (x3/Screen. width, y4/Screen. height, z); 44 GL. end (); 45 GL. begin (GL. LINES); 46 GL. color (Color. blue); 47 GL. vertex (new Vector3 (x2/Screen. width, y2/Screen. height, z); 48 GL. vertex (new Vector3 (x4/Screen. width, y4/Screen. height, z); 49 GL. end (); 50 51x1 = x3; 52x2 = x4; 53 y1 = y3; 54 y2 = y4; 55} 56 GL. popMatrix (); 57}

The parameters are: x, y, and z center three-dimensional coordinates, r circle radius, and accuracy. The smaller the precision, the more the circle

 

If any error occurs, please kindly advise