GEEKING

Rendering/g3d/g3dcpp/Vector2.cpp

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+/**
+ @file Vector2.cpp
+ 
+ 2D vector class, used for texture coordinates primarily.
+ 
+ @maintainer Morgan McGuire, http://graphics.cs.williams.edu
+ 
+ @cite Portions based on Dave Eberly'x Magic Software Library
+  at http://www.magic-software.com
+ 
+ @created 2001-06-02
+ @edited  2009-11-16
+ */
+
+#include "G3D/platform.h"
+#include <stdlib.h>
+#include "G3D/Vector2.h"
+#include "G3D/Vector3.h"
+#include "G3D/Vector4.h"
+#include "G3D/g3dmath.h"
+#include "G3D/format.h"
+
+namespace G3D {
+
+    
+size_t Vector2::hashCode() const {
+    unsigned int xhash = (*(int*)(void*)(&x));
+    unsigned int yhash = (*(int*)(void*)(&y));
+
+    return xhash + (yhash * 37);
+}
+
+//----------------------------------------------------------------------------
+
+Vector2 Vector2::random(G3D::Random& r) {
+    Vector2 result;
+
+    do {
+        result = Vector2(r.uniform(-1, 1), r.uniform(-1, 1));
+
+    } while (result.squaredLength() >= 1.0f);
+
+    result.unitize();
+
+    return result;
+}
+
+
+Vector2 Vector2::operator/ (float k) const {
+    return *this * (1.0f / k);
+}
+
+Vector2& Vector2::operator/= (float k) {
+    this->x /= k;
+    this->y /= k;
+    return *this;
+}
+
+//----------------------------------------------------------------------------
+float Vector2::unitize (float fTolerance) {
+	float fLength = length();
+
+    if (fLength > fTolerance) {
+		float fInvLength = 1.0f / fLength;
+        x *= fInvLength;
+        y *= fInvLength;
+    } else {
+        fLength = 0.0;
+    }
+
+    return fLength;
+}
+
+//----------------------------------------------------------------------------
+
+std::string Vector2::toString() const {
+    return G3D::format("(%g, %g)", x, y);
+}
+
+// 2-char swizzles
+
+Vector2 Vector2::xx() const  { return Vector2       (x, x); }
+Vector2 Vector2::yx() const  { return Vector2       (y, x); }
+Vector2 Vector2::xy() const  { return Vector2       (x, y); }
+Vector2 Vector2::yy() const  { return Vector2       (y, y); }
+
+// 3-char swizzles
+
+Vector3 Vector2::xxx() const  { return Vector3       (x, x, x); }
+Vector3 Vector2::yxx() const  { return Vector3       (y, x, x); }
+Vector3 Vector2::xyx() const  { return Vector3       (x, y, x); }
+Vector3 Vector2::yyx() const  { return Vector3       (y, y, x); }
+Vector3 Vector2::xxy() const  { return Vector3       (x, x, y); }
+Vector3 Vector2::yxy() const  { return Vector3       (y, x, y); }
+Vector3 Vector2::xyy() const  { return Vector3       (x, y, y); }
+Vector3 Vector2::yyy() const  { return Vector3       (y, y, y); }
+
+// 4-char swizzles
+
+Vector4 Vector2::xxxx() const  { return Vector4       (x, x, x, x); }
+Vector4 Vector2::yxxx() const  { return Vector4       (y, x, x, x); }
+Vector4 Vector2::xyxx() const  { return Vector4       (x, y, x, x); }
+Vector4 Vector2::yyxx() const  { return Vector4       (y, y, x, x); }
+Vector4 Vector2::xxyx() const  { return Vector4       (x, x, y, x); }
+Vector4 Vector2::yxyx() const  { return Vector4       (y, x, y, x); }
+Vector4 Vector2::xyyx() const  { return Vector4       (x, y, y, x); }
+Vector4 Vector2::yyyx() const  { return Vector4       (y, y, y, x); }
+Vector4 Vector2::xxxy() const  { return Vector4       (x, x, x, y); }
+Vector4 Vector2::yxxy() const  { return Vector4       (y, x, x, y); }
+Vector4 Vector2::xyxy() const  { return Vector4       (x, y, x, y); }
+Vector4 Vector2::yyxy() const  { return Vector4       (y, y, x, y); }
+Vector4 Vector2::xxyy() const  { return Vector4       (x, x, y, y); }
+Vector4 Vector2::yxyy() const  { return Vector4       (y, x, y, y); }
+Vector4 Vector2::xyyy() const  { return Vector4       (x, y, y, y); }
+Vector4 Vector2::yyyy() const  { return Vector4       (y, y, y, y); }
+
+
+
+} // namespace