public void DrawSegment(CCPoint from, CCPoint to, float radius, CCColor4F color)
{
var cl = color.ToColor();
var a = from;
var b = to;
var n = CCPoint.Normalize(CCPoint.PerpendicularCCW(a - b));
var lww = radius;
var nw = n * lww;
var v0 = b - nw;
var v1 = b + nw;
var v2 = a - nw;
var v3 = a + nw;
// Triangles from beginning to end
triangleVertices.Add(new VertexPositionColor(v1.ToVector3(), cl));
triangleVertices.Add(new VertexPositionColor(v2.ToVector3(), cl));
triangleVertices.Add(new VertexPositionColor(v0.ToVector3(), cl));
triangleVertices.Add(new VertexPositionColor(v1.ToVector3(), cl));
triangleVertices.Add(new VertexPositionColor(v2.ToVector3(), cl));
triangleVertices.Add(new VertexPositionColor(v3.ToVector3(), cl));
var mb = (float)Math.Atan2(v1.Y - b.Y, v1.X - b.X);
var ma = (float)Math.Atan2(v2.Y - a.Y, v2.X - a.X);
// Draw rounded line caps
DrawSolidArc(a, radius, ma, MathHelper.Pi, color);
DrawSolidArc(b, radius, mb, MathHelper.Pi, color);
dirty = true;
}
// See http://slabode.exofire.net/circle_draw.shtml
// An Efficient Way to Draw Approximate Circles in OpenGL
// Try to keep from calculating Cos and Sin of values everytime and just use
// add and subtract where possible to calculate the values.
public void DrawDot(CCPoint pos, float radius, CCColor4F color)
{
var cl = color.ToColor();
var segments = 10 * (float)Math.Sqrt(radius); //<- Let's try to guess at # segments for a reasonable smoothness
float theta = MathHelper.Pi * 2.0f / segments;
float tangetial_factor = (float)Math.Tan(theta); //calculate the tangential factor
float radial_factor = (float)Math.Cos(theta); //calculate the radial factor
float x = radius; //we start at angle = 0
float y = 0;
var verticeCenter = new VertexPositionColor(new Vector3(pos.X, pos.Y, 0), cl);
var vert1 = new VertexPositionColor(Vector3.Zero, cl);
float tx = 0;
float ty = 0;
for (int i = 0; i < segments; i++)
{
vert1.Position.X = x + pos.X;
vert1.Position.Y = y + pos.Y;
triangleVertices.Add(vert1); // output vertex
//calculate the tangential vector
//remember, the radial vector is (x, y)
//to get the tangential vector we flip those coordinates and negate one of them
tx = -y;
ty = x;
//add the tangential vector
x += tx * tangetial_factor;
y += ty * tangetial_factor;
//correct using the radial factor
x *= radial_factor;
y *= radial_factor;
vert1.Position.X = x + pos.X;
vert1.Position.Y = y + pos.Y;
triangleVertices.Add(vert1); // output vertex
triangleVertices.Add(verticeCenter);
}
dirty = true;
}
// See http://slabode.exofire.net/circle_draw.shtml
// An Efficient Way to Draw Approximate Circles in OpenGL
// Try to keep from calculating Cos and Sin of values everytime and just use
// add and subtract where possible to calculate the values.
public void DrawDot(CCPoint pos, float radius, CCColor4F color)
{
var cl = color.ToColor();
var segments = 10 * (float)Math.Sqrt(radius); //<- Let's try to guess at # segments for a reasonable smoothness
float theta = MathHelper.Pi * 2.0f / segments;
float tangetial_factor = (float)Math.Tan(theta); //calculate the tangential factor
float radial_factor = (float)Math.Cos(theta); //calculate the radial factor
float x = radius; //we start at angle = 0
float y = 0;
var verticeCenter = new VertexPositionColor(new Vector3(pos.X, pos.Y, 0), cl);
var vert1 = new VertexPositionColor(Vector3.Zero, cl);
float tx = 0;
float ty = 0;
for (int i = 0; i < segments; i++)
{
vert1.Position.X = x + pos.X;
vert1.Position.Y = y + pos.Y;
triangleVertices.Add(vert1); // output vertex
//calculate the tangential vector
//remember, the radial vector is (x, y)
//to get the tangential vector we flip those coordinates and negate one of them
tx = -y;
ty = x;
//add the tangential vector
x += tx * tangetial_factor;
y += ty * tangetial_factor;
//correct using the radial factor
x *= radial_factor;
y *= radial_factor;
vert1.Position.X = x + pos.X;
vert1.Position.Y = y + pos.Y;
triangleVertices.Add(vert1); // output vertex
triangleVertices.Add(verticeCenter);
}
dirty = true;
}
public void DrawPolygon(CCPoint[] verts, int count, CCColor4F fillColor, float borderWidth,
CCColor4F borderColor)
{
var extrude = new ExtrudeVerts[count];
for (int i = 0; i < count; i++)
{
var v0 = verts[(i - 1 + count) % count];
var v1 = verts[i];
var v2 = verts[(i + 1) % count];
var n1 = CCPoint.Normalize(CCPoint.PerpendicularCCW(v1 - v0));
var n2 = CCPoint.Normalize(CCPoint.PerpendicularCCW(v2 - v1));
var offset = (n1 + n2) * (1.0f / (CCPoint.Dot(n1, n2) + 1.0f));
extrude[i] = new ExtrudeVerts() {offset = offset, n = n2};
}
bool outline = (borderColor.A > 0.0f && borderWidth > 0.0f);
var colorFill = fillColor.ToColor();
var borderFill = borderColor.ToColor();
float inset = (!outline ? 0.5f : 0.0f);
for (int i = 0; i < count - 2; i++)
{
var v0 = verts[0] - (extrude[0].offset * inset);
var v1 = verts[i + 1] - (extrude[i + 1].offset * inset);
var v2 = verts[i + 2] - (extrude[i + 2].offset * inset);
triangleVertices.Add(new VertexPositionColor(v0.ToVector3(), colorFill)); //__t(v2fzero)
triangleVertices.Add(new VertexPositionColor(v1.ToVector3(), colorFill)); //__t(v2fzero)
triangleVertices.Add(new VertexPositionColor(v2.ToVector3(), colorFill)); //__t(v2fzero)
}
for (int i = 0; i < count; i++)
{
int j = (i + 1) % count;
var v0 = verts[i];
var v1 = verts[j];
var n0 = extrude[i].n;
var offset0 = extrude[i].offset;
var offset1 = extrude[j].offset;
if (outline)
{
var inner0 = (v0 - (offset0 * borderWidth));
var inner1 = (v1 - (offset1 * borderWidth));
var outer0 = (v0 + (offset0 * borderWidth));
var outer1 = (v1 + (offset1 * borderWidth));
triangleVertices.Add(new VertexPositionColor(inner0.ToVector3(), borderFill)); //__t(v2fneg(n0))
triangleVertices.Add(new VertexPositionColor(inner1.ToVector3(), borderFill)); //__t(v2fneg(n0))
triangleVertices.Add(new VertexPositionColor(outer1.ToVector3(), borderFill)); //__t(n0)
triangleVertices.Add(new VertexPositionColor(inner0.ToVector3(), borderFill)); //__t(v2fneg(n0))
triangleVertices.Add(new VertexPositionColor(outer0.ToVector3(), borderFill)); //__t(n0)
triangleVertices.Add(new VertexPositionColor(outer1.ToVector3(), borderFill)); //__t(n0)
}
else
{
var inner0 = (v0 - (offset0 * 0.5f));
var inner1 = (v1 - (offset1 * 0.5f));
var outer0 = (v0 + (offset0 * 0.5f));
var outer1 = (v1 + (offset1 * 0.5f));
triangleVertices.Add(new VertexPositionColor(inner0.ToVector3(), colorFill)); //__t(v2fzero)
triangleVertices.Add(new VertexPositionColor(inner1.ToVector3(), colorFill)); //__t(v2fzero)
triangleVertices.Add(new VertexPositionColor(outer1.ToVector3(), colorFill)); //__t(n0)
triangleVertices.Add(new VertexPositionColor(inner0.ToVector3(), colorFill)); //__t(v2fzero)
triangleVertices.Add(new VertexPositionColor(outer0.ToVector3(), colorFill)); //__t(n0)
triangleVertices.Add(new VertexPositionColor(outer1.ToVector3(), colorFill)); //__t(n0)
}
}
dirty = true;
}
public void DrawSegment(CCPoint from, CCPoint to, float radius, CCColor4F color)
{
var cl = color.ToColor();
var a = from;
var b = to;
var n = CCPoint.Normalize(CCPoint.PerpendicularCCW(a - b));
var lww = radius;
var nw = n * lww;
var v0 = b - nw;
var v1 = b + nw;
var v2 = a - nw;
var v3 = a + nw;
// Triangles from beginning to end
triangleVertices.Add(new VertexPositionColor(v1.ToVector3(), cl));
triangleVertices.Add(new VertexPositionColor(v2.ToVector3(), cl));
triangleVertices.Add(new VertexPositionColor(v0.ToVector3(), cl));
triangleVertices.Add(new VertexPositionColor(v1.ToVector3(), cl));
triangleVertices.Add(new VertexPositionColor(v2.ToVector3(), cl));
triangleVertices.Add(new VertexPositionColor(v3.ToVector3(), cl));
var mb = (float)Math.Atan2(v1.Y - b.Y, v1.X - b.X);
var ma = (float)Math.Atan2(v2.Y - a.Y, v2.X - a.X);
// Draw rounded line caps
DrawSolidArc(a, radius, ma, MathHelper.Pi, color);
DrawSolidArc(b, radius, mb, MathHelper.Pi, color);
dirty = true;
}
public void DrawPolygon(CCPoint[] verts, int count, CCColor4F fillColor, float borderWidth,
CCColor4F borderColor)
{
var extrude = new ExtrudeVerts[count];
for (int i = 0; i < count; i++)
{
var v0 = verts[(i - 1 + count) % count];
var v1 = verts[i];
var v2 = verts[(i + 1) % count];
var n1 = CCPoint.Normalize(CCPoint.PerpendicularCCW(v1 - v0));
var n2 = CCPoint.Normalize(CCPoint.PerpendicularCCW(v2 - v1));
var offset = (n1 + n2) * (1.0f / (CCPoint.Dot(n1, n2) + 1.0f));
extrude[i] = new ExtrudeVerts()
{
offset = offset, n = n2
};
}
bool outline = (borderColor.A > 0.0f && borderWidth > 0.0f);
var colorFill = fillColor.ToColor();
var borderFill = borderColor.ToColor();
float inset = (!outline ? 0.5f : 0.0f);
for (int i = 0; i < count - 2; i++)
{
var v0 = verts[0] - (extrude[0].offset * inset);
var v1 = verts[i + 1] - (extrude[i + 1].offset * inset);
var v2 = verts[i + 2] - (extrude[i + 2].offset * inset);
triangleVertices.Add(new VertexPositionColor(v0.ToVector3(), colorFill)); //__t(v2fzero)
triangleVertices.Add(new VertexPositionColor(v1.ToVector3(), colorFill)); //__t(v2fzero)
triangleVertices.Add(new VertexPositionColor(v2.ToVector3(), colorFill)); //__t(v2fzero)
}
for (int i = 0; i < count; i++)
{
int j = (i + 1) % count;
var v0 = verts[i];
var v1 = verts[j];
var n0 = extrude[i].n;
var offset0 = extrude[i].offset;
var offset1 = extrude[j].offset;
if (outline)
{
var inner0 = (v0 - (offset0 * borderWidth));
var inner1 = (v1 - (offset1 * borderWidth));
var outer0 = (v0 + (offset0 * borderWidth));
var outer1 = (v1 + (offset1 * borderWidth));
triangleVertices.Add(new VertexPositionColor(inner0.ToVector3(), borderFill)); //__t(v2fneg(n0))
triangleVertices.Add(new VertexPositionColor(inner1.ToVector3(), borderFill)); //__t(v2fneg(n0))
triangleVertices.Add(new VertexPositionColor(outer1.ToVector3(), borderFill)); //__t(n0)
triangleVertices.Add(new VertexPositionColor(inner0.ToVector3(), borderFill)); //__t(v2fneg(n0))
triangleVertices.Add(new VertexPositionColor(outer0.ToVector3(), borderFill)); //__t(n0)
triangleVertices.Add(new VertexPositionColor(outer1.ToVector3(), borderFill)); //__t(n0)
}
else
{
var inner0 = (v0 - (offset0 * 0.5f));
var inner1 = (v1 - (offset1 * 0.5f));
var outer0 = (v0 + (offset0 * 0.5f));
var outer1 = (v1 + (offset1 * 0.5f));
triangleVertices.Add(new VertexPositionColor(inner0.ToVector3(), colorFill)); //__t(v2fzero)
triangleVertices.Add(new VertexPositionColor(inner1.ToVector3(), colorFill)); //__t(v2fzero)
triangleVertices.Add(new VertexPositionColor(outer1.ToVector3(), colorFill)); //__t(n0)
triangleVertices.Add(new VertexPositionColor(inner0.ToVector3(), colorFill)); //__t(v2fzero)
triangleVertices.Add(new VertexPositionColor(outer0.ToVector3(), colorFill)); //__t(n0)
triangleVertices.Add(new VertexPositionColor(outer1.ToVector3(), colorFill)); //__t(n0)
}
}
dirty = true;
}
