From 18febfa792fd1bfe7f773437ab011618a38d95c9 Mon Sep 17 00:00:00 2001
From: Yoann <yoann.b87@voila.fr>
Date: Thu, 19 Jan 2012 10:23:19 +0100
Subject: [PATCH] Ajout des fonction insetProportionnal pour Triangle et Quad,
 ainsi que de fonctions utilisateire dans Segment.

---
 geometry/quad.cpp     | 13 +++++++++++++
 geometry/quad.hh      |  1 +
 geometry/segment.cpp  |  8 ++++++++
 geometry/segment.hh   |  2 ++
 geometry/triangle.cpp | 18 ++++++++++++++++++
 geometry/triangle.hh  |  1 +
 6 files changed, 43 insertions(+)

diff --git a/geometry/quad.cpp b/geometry/quad.cpp
index a45bd3b..39088f5 100644
--- a/geometry/quad.cpp
+++ b/geometry/quad.cpp
@@ -223,6 +223,19 @@ float Quad::surface() const {
 	return ne.surface() + sw.surface();
 }
 
+Quad Quad::insetProportionnal(float prop) {
+    Quad rQuad= *this;
+
+    Vertex bc = Segment(Segment(c[NW],c[NE]).center(),Segment(c[SW],c[SE]).center()).center();
+    prop = prop;
+
+    rQuad[NW] = Segment(bc,c[NW]).at(prop);
+    rQuad[NE] = Segment(bc,c[NE]).at(prop);
+    rQuad[SE] = Segment(bc,c[SE]).at(prop);
+    rQuad[SW] = Segment(bc,c[SW]).at(prop);
+    return rQuad;
+}
+
 Quad Quad::offsetNormal(float offset) const {
 	return ((*this) + Triangle(c[NE], c[SE], c[SW]).normal().setNorm(offset));
 }
diff --git a/geometry/quad.hh b/geometry/quad.hh
index f0fd155..94b5993 100644
--- a/geometry/quad.hh
+++ b/geometry/quad.hh
@@ -48,6 +48,7 @@ class Quad {
 	float surface() const;
 	//void cutCornerCorner(Coin from) const;
 	Quad makeParallelogram() const;
+	Quad insetProportionnal(float prop);
 	Quad offsetNormal(float offset) const;
 	Vertex normal() const;
 };
diff --git a/geometry/segment.cpp b/geometry/segment.cpp
index 8531d51..5d9ee19 100644
--- a/geometry/segment.cpp
+++ b/geometry/segment.cpp
@@ -11,6 +11,14 @@ Segment Segment::reduce(float value) {
     return Segment(u,u+((v - u) / reduc));
 }
 
+Vertex Segment::at(float proportiannalDist) {
+    return Segment(u,u+((v-u)*proportiannalDist)).v;
+}
+
+Vertex Segment::center() {
+    return at(1./2.);
+}
+
 float Segment::width() {
 	return std::abs(u.x - v.x);
 }
diff --git a/geometry/segment.hh b/geometry/segment.hh
index 34728d6..9f7fe58 100644
--- a/geometry/segment.hh
+++ b/geometry/segment.hh
@@ -13,6 +13,8 @@ class Segment {
 	float length();
 	float width();
 	float height();
+	Vertex center();
+	Vertex at(float);
 	Segment reduce(float value);
 	Vertex randomPos(int seed, int n, float a, float b); // Renvoie un vertex sur le segment [u,v], à une position entre a et b.
 };
diff --git a/geometry/triangle.cpp b/geometry/triangle.cpp
index e18863c..d474e8b 100644
--- a/geometry/triangle.cpp
+++ b/geometry/triangle.cpp
@@ -99,3 +99,21 @@ Vertex Triangle::normalizedNormal() const {
 Triangle Triangle::offsetNormal(float offset) const {
 	return ((*this) + this->normal().setNorm(offset));
 }
+
+Triangle Triangle::insetProportionnal(float prop) {
+    Triangle rTriangle = *this;
+    //ibc : isobarycentre.
+    Vertex ibc = Segment(c[TOP],Segment(c[LEFT],c[RIGHT]).center()).at(2./3.);
+    prop = prop;
+
+    rTriangle[TOP] = Segment(ibc,c[TOP]).at(prop);
+    rTriangle[LEFT] = Segment(ibc,c[LEFT]).at(prop);
+    rTriangle[RIGHT] = Segment(ibc,c[RIGHT]).at(prop);
+    return rTriangle;
+}
+
+
+
+
+
+
diff --git a/geometry/triangle.hh b/geometry/triangle.hh
index dfe05d9..6c3c3bb 100644
--- a/geometry/triangle.hh
+++ b/geometry/triangle.hh
@@ -38,6 +38,7 @@ public :
 	Vertex normal() const;
 	Vertex normalizedNormal() const;
 	Triangle offsetNormal(float offset) const;
+	Triangle insetProportionnal(float prop);
 };
 
 #endif