Combining Transformation Operators - Essentials of Interactive Computer Graphics - page 238

class CModel {

Source file. Model.h file

in the Model folder of the

.
private :
.
// a struct : For simplicity and clarity of illustration

D3D _ XformInfo project.

A:

struct RectWithXform {
UWB _ PrimitiveRectangle m _ rect; // A rectangle
UWB _ XformInfo m _ xform; }; // The associated transformation information
// R 1 and R 2 rectangles with transformation information

RectWithXform m _ Rect1, m _ Rect2;

B:

};

C: void CModel::SetTranslation( float x, float y) {

m _ Rect1.m _ xform.SetTranslation( vec3 (x,y,0)); // set the same translation to both

m _ Rect2.m _ xform.SetTranslation( vec3 (x,y,0)); }

// R 1 and R 2

// R 1 only

void CModel::SetScale( float x, float y){m _ Rect1.m _ xform.SetScale( vec3 (x,y,0)); }
// R 2 only

D:

void CModel::SetRotation( float theta) { m _ Rect2.m _ xform.SetRotationRadians(theta); }

E:

F:

void CModel::DrawModel()
.
m _ DrawHelper.InitializeModelTransform();
m _ DrawHelper.PushModelTransform();
m _ Rect1.m _ xform.SetUpModelStack( m _ DrawHelper );
m _ Rect1.m _ rect.Draw( lod, m _ DrawHelper );
m _ DrawHelper.PopModelTransform();
// ... similar operations for m _ Rect2

Listing 9.11. The CModel class of Tutorial 9.6.

Tutorial 9.7. Supporting User Interaction with XformInfo

Tutorial 9.7.
Project Name:
D3D _ XformInfoControls
Library Support:
UWB _ MFC _ Lib1
UWB _ D3D _ Lib9

• Goals. Examine the effects of changing the parameters in the XformInfo
class.

• Approach. Implement a GUI class that allows the user to interactively
change every parameter in the XformInfo class.