public:
void ResetExample( PaintEventArgs^ e )
{
Pen^ myPen = gcnew Pen( Color::Blue,1.0f );
Pen^ myPen2 = gcnew Pen( Color::Red,1.0f );
// Create a matrix that scales by 5 in the x direction and
// by 3 in the y direction.
Matrix^ myMatrix = gcnew Matrix( 5.0f,0.0f,0.0f,3.0f,0.0f,0.0f );
// List the matrix elements to the screen.
ListMatrixElements( e, myMatrix, "Beginning Matrix", 6, 20 );
// Reset the matrix to identity.
myMatrix->Reset();
// Again list the matrix elements to the screen.
ListMatrixElements2( e, myMatrix, "Matrix After Reset", 6, 40 );
// Translate the matrix by 50 points in the x-axis and 40 points
// in the y-axis.
myMatrix->Translate( 50.0f, 40.0f );
// List the matrix elements to the screen.
ListMatrixElements1( e, myMatrix, "Matrix After Translation", 6, 60 );
// Draw a rectangle to the screen.
e->Graphics->DrawRectangle( myPen, 0, 0, 100, 100 );
// Apply the matrix transform to the Graphics.
e->Graphics->Transform = myMatrix;
// Draw another rectangle to the screen that has the transform
// applied.
e->Graphics->DrawRectangle( myPen2, 0, 0, 100, 100 );
}
//-------------------------------------------------------
// This function is a helper function to
// list the contents of a matrix.
//-------------------------------------------------------
void ListMatrixElements2( PaintEventArgs^ e, Matrix^ matrix, String^ matrixName, int numElements, int y )
{
// Set up variables for drawing the array
// of points to the screen.
int i;
float x = 20,X = 200;
System::Drawing::Font^ myFont = gcnew System::Drawing::Font( "Arial",8 );
SolidBrush^ myBrush = gcnew SolidBrush( Color::Black );
// Draw the matrix name to the screen.
e->Graphics->DrawString( String::Concat( matrixName, ": " ), myFont, myBrush, (float)x, (float)y );
// Draw the set of path points and types to the screen.
for ( i = 0; i < numElements; i++ )
{
e->Graphics->DrawString( String::Concat( matrix->Elements[ i ], ", " ), myFont, myBrush, (float)X, (float)y );
X += 30;
}
}