Attributes and Behaviors of Primitives - Essentials of Interactive Computer Graphics - page 167

class UWB _ PrimitiveLine : public UWB _ Primitive {
public :
A: virtual void Update( float elapsed _ seconds);
B: virtual void MouseDownVertex( int vertexID, float x, float y);
virtual void MoveTo( float x, float y);
C: void SetStartPoint( float x, float y, float z=0.0f);
vec3 GetStartPoint() const ;
.
protected :
D: void DrawPrimitive( eLevelOfDetail lod, UWB _ DrawHelper& draw _ helper ) const ;
void SetupDrawAttributes(UWB _ DrawHelper& draw _ helper) const ;
E: vec3 m _ start, m _ end; // the end points on the line

};

A1: void UWB _ PrimitiveLine::Update( float elapsed _ seconds)
vec3 adjust _ vec = m _ velocity * elapsed _ seconds;
m _ start += adjust _ vec; m _ end += adjust _ vec;
B1: void UWB _ PrimitiveLine::MouseDownVertex( int vertexID, float x, float y)
if (0 == vertexID) SetStartPoint(x,y);
SetEndPoint(x,y);
void UWB _ PrimitiveLine::MoveTo( float x, float y) { SetEndPoint(x,y); }
.
D2: void UWB _ PrimitiveLine::SetupDrawAttributes(UWB _ DrawHelper& draw _ helper) const
// super class to set color
__ super::SetupDrawAttributes(draw _ helper);
// set current shading mode, and
draw _ helper.SetShadeMode(m _ ShadeMode);
// set the shading color
draw _ helper.SetColor2(m _ ShadingColor);

Source files.
uwbgl _ PrimitiveLine1.h/cpp
files in the Common Files/
Primitives

Listing 7.11. The UWB _ PrimitiveLine class (Tutorial 7.2).

subfolder of the

UWBGL _ D3D _ Lib5 project.

class UWB _ PrimitiveCircle : public UWB _ Primitive {
public :

virtual void Update( float elapsed _ seconds); A:

B: virtual void MouseDownVertex( int vertexID, float x, float y);

virtual void MoveTo( float x, float y);

Listing 7.12. The UWB _ PrimitiveCircle class (Tutorial 7.2).