void DrawArrow(V2 from, V2 to, float w, Color color)
{
V2 dp = to - from;
float dpLen = dp.Len();
V2 dir = dp / dpLen;
V2 perp = new V2 {
x = dir.y, y = -dir.x
};
V2 cornerHorDp = perp * w;
const float HEAD_LEN_RATIO = 0.3f;
V2 corner00 = from + cornerHorDp;
V2 corner01 = from - cornerHorDp;
V2 corner1Center = from + (dp * (1f - HEAD_LEN_RATIO));
V2 corner10 = corner1Center + cornerHorDp;
V2 corner11 = corner1Center - cornerHorDp;
const float HEAD_WITH_RATIO = 2f;
V2 headTop = to;
V2 headBottom0 = corner1Center + cornerHorDp * HEAD_WITH_RATIO;
V2 headBottom1 = corner1Center - cornerHorDp * HEAD_WITH_RATIO;
renderVerts.Add(Convert(corner00));
renderVerts.Add(Convert(corner01));
renderVerts.Add(Convert(corner10));
renderVerts.Add(Convert(corner11));
renderVerts.Add(Convert(headTop));
renderVerts.Add(Convert(headBottom0));
renderVerts.Add(Convert(headBottom1));
int atVert = renderVerts.Count - 1;
renderTris.Add(atVert--);
renderTris.Add(atVert--);
renderTris.Add(atVert--);
renderTris.Add(atVert);
renderTris.Add(atVert - 1);
renderTris.Add(atVert - 2);
renderTris.Add(atVert - 1);
renderTris.Add(atVert - 2);
renderTris.Add(atVert - 3);
for (int i = 0; i < 7; i++)
{
renderColors.Add(color);
}
}