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// -----------------------------------------------------------------------------
// Copyright (c) 2014, Nicolas P. Rougier. All Rights Reserved.
// Distributed under the (new) BSD License.
// -----------------------------------------------------------------------------
float marker_pin(vec2 P, float size)
{
size *= .9;
vec2 c1 = vec2(0.0,-0.15)*size;
float r1 = length(P-c1)-size/2.675;
vec2 c2 = vec2(+1.49,-0.80)*size;
float r2 = length(P-c2) - 2.*size;
vec2 c3 = vec2(-1.49,-0.80)*size;
float r3 = length(P-c3) - 2.*size;
float r4 = length(P-c1)-size/5;
return max( min(r1,max(max(r2,r3),-P.y)), -r4);
}
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