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FS#10 - Add rotation to sf::View

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Slightly changed the public interface of sf::View

git-svn-id: https://sfml.svn.sourceforge.net/svnroot/sfml/branches/sfml2@1152 4e206d99-4929-0410-ac5d-dfc041789085
This commit is contained in:
LaurentGom 2009-06-21 21:23:30 +00:00
parent 5978d015eb
commit 1bb96087ad
7 changed files with 141 additions and 98 deletions
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6
include/SFML/Graphics/Matrix3.hpp
View File

@ -72,10 +72,12 @@ public :
////////////////////////////////////////////////////////////
/// Build a matrix from a projection
///
/// \param Rectangle : Rectangle defining the region to project
/// \param Center : Center of the view
/// \param Size : Size of the view
/// \param Rotation : Angle of rotation of the view rectangle, in degrees
///
////////////////////////////////////////////////////////////
void SetFromProjection(const FloatRect& Rectangle);
void SetFromProjection(const Vector2f& Center, const Vector2f& Size, float Rotation);
////////////////////////////////////////////////////////////
/// Transform a point by the matrix

25
include/SFML/Graphics/Matrix3.inl
View File

@ -76,19 +76,26 @@ inline void Matrix3::SetFromTransformations(const Vector2f& Center, const Vector
////////////////////////////////////////////////////////////
/// Build a matrix from a projection
////////////////////////////////////////////////////////////
inline void Matrix3::SetFromProjection(const FloatRect& Rectangle)
inline void Matrix3::SetFromProjection(const Vector2f& Center, const Vector2f& Size, float Rotation)
{
// Rotation components
float Angle = Rotation * 3.141592654f / 180.f;
float Cos = static_cast<float>(cos(Angle));
float Sin = static_cast<float>(sin(Angle));
float Tx = -Center.x * Cos - Center.y * Sin + Center.x;
float Ty = Center.x * Sin - Center.y * Cos + Center.y;
// Projection components
float A = 2.f / Rectangle.GetSize().x;
float B = -2.f / Rectangle.GetSize().y;
float C = -(Rectangle.Left + Rectangle.Right) / Rectangle.GetSize().x;
float D = (Rectangle.Bottom + Rectangle.Top) / Rectangle.GetSize().y;
float A = 2.f / Size.x;
float B = -2.f / Size.y;
float C = -A * Center.x;
float D = -B * Center.y;
// Rebuild the projection matrix
myData[0] = A; myData[4] = 0.f; myData[8] = 0.f; myData[12] = C;
myData[1] = 0.f; myData[5] = B; myData[9] = 0.f; myData[13] = D;
myData[2] = 0.f; myData[6] = 0.f; myData[10] = 1.f; myData[14] = 0.f;
myData[3] = 0.f; myData[7] = 0.f; myData[11] = 0.f; myData[15] = 1.f;
myData[0] = A * Cos; myData[4] = A * Sin; myData[8] = 0.f; myData[12] = A * Tx + C;
myData[1] = -B * Sin; myData[5] = B * Cos; myData[9] = 0.f; myData[13] = B * Ty + D;
myData[2] = 0.f; myData[6] = 0.f; myData[10] = 1.f; myData[14] = 0.f;
myData[3] = 0.f; myData[7] = 0.f; myData[11] = 0.f; myData[15] = 1.f;
}

85
include/SFML/Graphics/View.hpp
View File

@ -37,20 +37,33 @@
namespace sf
{
////////////////////////////////////////////////////////////
/// This class defines a view (position, size, etc.);
/// you can consider it as a 2D camera
/// This class defines a 2D view. A view is like a camera,
/// which defines what part of the scene is shown and
/// where it is shown.
/// A sf::View is defined by the following components:
/// its source rectangle in the scene, an optional rotation
/// to apply to the source rectangle, and the destination
/// rectangle where it will be displayed, in the render target
/// that it is attached to.
////////////////////////////////////////////////////////////
class SFML_API View
{
public :
////////////////////////////////////////////////////////////
/// Construct the view from a rectangle
///
/// \param ViewRect : Rectangle defining the position and size of the view (1000x1000 by default)
/// Default constructor
/// Constructs a default view of (0, 0, 1000, 1000)
///
////////////////////////////////////////////////////////////
explicit View(const FloatRect& ViewRect = FloatRect(0, 0, 1000, 1000));
View();
////////////////////////////////////////////////////////////
/// Construct the view from a rectangle
///
/// \param Rectangle : Rectangle defining the view
///
////////////////////////////////////////////////////////////
explicit View(const FloatRect& Rectangle);
////////////////////////////////////////////////////////////
/// Construct the view from its center and size
@ -62,24 +75,7 @@ public :
View(const Vector2f& Center, const Vector2f& Size);
////////////////////////////////////////////////////////////
/// Set the rectangle defining the view by its center and size
///
/// \param Center : Center of the view rectangle
/// \param Size : Size of the view rectangle
///
////////////////////////////////////////////////////////////
void SetRect(const Vector2f& Center, const Vector2f& Size);
////////////////////////////////////////////////////////////
/// Set the rectangle defining the view
///
/// \param Rect : Rectangle defining the center and size of the view
///
////////////////////////////////////////////////////////////
void SetRect(const FloatRect& Rect);
////////////////////////////////////////////////////////////
/// Change the center of the view (take 2 values)
/// Change the center of the view
///
/// \param X : X coordinate of the new center
/// \param Y : Y coordinate of the new center
@ -88,7 +84,7 @@ public :
void SetCenter(float X, float Y);
////////////////////////////////////////////////////////////
/// Change the center of the view (take a vector)
/// Change the center of the view
///
/// \param Center : New center
///
@ -96,7 +92,7 @@ public :
void SetCenter(const Vector2f& Center);
////////////////////////////////////////////////////////////
/// Change the size of the view (take 2 values)
/// Change the size of the view
///
/// \param Width : New width
/// \param Height : New height
@ -105,7 +101,7 @@ public :
void SetSize(float Width, float Height);
////////////////////////////////////////////////////////////
/// Change the size of the view (take a vector)
/// Change the size of the view
///
/// \param HalfSize : New half-size
///
@ -113,13 +109,21 @@ public :
void SetSize(const Vector2f& Size);
////////////////////////////////////////////////////////////
/// Get the rectangle defining the view,
/// which is the combined center and size.
/// Set the angle of rotation of the view
///
/// \return View rectangle
/// \param Angle : New angle, in degrees
///
////////////////////////////////////////////////////////////
FloatRect GetRect() const;
void SetRotation(float Angle);
////////////////////////////////////////////////////////////
/// Reset the view to the given rectangle.
/// Note: this function resets the rotation angle to 0.
///
/// \param Rectangle : Rectangle defining the view
///
////////////////////////////////////////////////////////////
void Reset(const FloatRect& Rectangle);
////////////////////////////////////////////////////////////
/// Get the center of the view
@ -138,7 +142,7 @@ public :
const Vector2f& GetSize() const;
////////////////////////////////////////////////////////////
/// Move the view (take 2 values)
/// Move the view
///
/// \param OffsetX : Offset to move the view, on X axis
/// \param OffsetY : Offset to move the view, on Y axis
@ -147,17 +151,25 @@ public :
void Move(float OffsetX, float OffsetY);
////////////////////////////////////////////////////////////
/// Move the view (take a vector)
/// Move the view
///
/// \param Offset : Offset to move the view
///
////////////////////////////////////////////////////////////
void Move(const Vector2f& Offset);
////////////////////////////////////////////////////////////
/// Rotate the view
///
/// \param Angle : Angle to rotate, in degrees
///
////////////////////////////////////////////////////////////
void Rotate(float Angle);
////////////////////////////////////////////////////////////
/// Resize the view rectangle to simulate a zoom / unzoom effect
///
/// \param Factor : Zoom factor to apply, relative to the current zoom
/// \param Factor : Zoom factor to apply, relative to the current size
///
////////////////////////////////////////////////////////////
void Zoom(float Factor);
@ -183,8 +195,9 @@ private :
////////////////////////////////////////////////////////////
// Member data
////////////////////////////////////////////////////////////
sf::Vector2f myCenter; ///< Center of the view
sf::Vector2f mySize; ///< Size of the view
Vector2f myCenter; ///< Center of the view, in scene coordinates
Vector2f mySize; ///< Size of the view, in scene coordinates
float myRotation; ///< Angle of rotation of the view rectangle, in degrees
mutable Matrix3 myMatrix; ///< Precomputed projection matrix corresponding to the view
mutable Matrix3 myInverseMatrix; ///< Precomputed inverse projection matrix corresponding to the view
mutable bool myNeedUpdate; ///< Internal state telling if the matrix needs to be updated

2
samples/qt/Main.cpp
View File

@ -60,7 +60,7 @@ private :
// Adjust the size of the default view when the widget is resized
if (Event.Type == sf::Event::Resized)
{
GetDefaultView().SetRect(sf::FloatRect(0, 0, Event.Size.Width, Event.Size.Height));
GetDefaultView().Reset(sf::FloatRect(0, 0, Event.Size.Width, Event.Size.Height));
}
}

13
src/SFML/Graphics/PostFX.cpp
View File

@ -303,13 +303,16 @@ void PostFX::Render(RenderTarget& Target) const
IntRect FrameBufferRect(0, 0, myFrameBuffer.GetWidth(), myFrameBuffer.GetHeight());
FloatRect TexCoords = myFrameBuffer.GetTexCoords(FrameBufferRect);
// Set the projection matrix to the identity so that the screen coordinates are in the range [-1, 1]
GLCheck(glMatrixMode(GL_PROJECTION));
GLCheck(glLoadIdentity());
// Render a fullscreen quad using the effect on our framebuffer
FloatRect Screen = Target.GetView().GetRect();
glBegin(GL_QUADS);
glTexCoord2f(TexCoords.Left, TexCoords.Top); glVertex2f(Screen.Left, Screen.Top);
glTexCoord2f(TexCoords.Right, TexCoords.Top); glVertex2f(Screen.Right, Screen.Top);
glTexCoord2f(TexCoords.Right, TexCoords.Bottom); glVertex2f(Screen.Right, Screen.Bottom);
glTexCoord2f(TexCoords.Left, TexCoords.Bottom); glVertex2f(Screen.Left, Screen.Bottom);
glTexCoord2f(TexCoords.Left, TexCoords.Top); glVertex2f(-1, 1);
glTexCoord2f(TexCoords.Right, TexCoords.Top); glVertex2f( 1, 1);
glTexCoord2f(TexCoords.Right, TexCoords.Bottom); glVertex2f( 1, -1);
glTexCoord2f(TexCoords.Left, TexCoords.Bottom); glVertex2f(-1, -1);
glEnd();
// Disable program

2
src/SFML/Graphics/RenderTarget.cpp
View File

@ -175,7 +175,7 @@ void RenderTarget::Initialize()
SetRenderStates();
// Setup the default view
myDefaultView.SetRect(FloatRect(0, 0, static_cast<float>(GetWidth()), static_cast<float>(GetHeight())));
myDefaultView.Reset(FloatRect(0, 0, static_cast<float>(GetWidth()), static_cast<float>(GetHeight())));
SetView(myDefaultView);
Activate(false);

106
src/SFML/Graphics/View.cpp
View File

@ -30,12 +30,32 @@
namespace sf
{
////////////////////////////////////////////////////////////
/// Default constructor
/// Constructs a default view of (0, 0, 1000, 1000)
////////////////////////////////////////////////////////////
View::View() :
myCenter (),
mySize (),
myRotation (0),
myNeedUpdate (true),
myNeedInvUpdate(true)
{
Reset(FloatRect(0, 0, 1000, 1000));
}
////////////////////////////////////////////////////////////
/// Construct the view from a rectangle
////////////////////////////////////////////////////////////
View::View(const FloatRect& Rect)
View::View(const FloatRect& Rectangle) :
myCenter (),
mySize (),
myRotation (0),
myNeedUpdate (true),
myNeedInvUpdate(true)
{
SetRect(Rect);
Reset(Rectangle);
}
@ -45,36 +65,15 @@ View::View(const FloatRect& Rect)
View::View(const Vector2f& Center, const Vector2f& Size) :
myCenter (Center),
mySize (Size),
myRotation (0),
myNeedUpdate (true),
myNeedInvUpdate(true)
{
}
////////////////////////////////////////////////////////////
/// Set the rectangle defining the view by its center and size
////////////////////////////////////////////////////////////
void View::SetRect(const Vector2f& Center, const Vector2f& Size)
{
myCenter = Center;
mySize = Size;
myNeedUpdate = true;
myNeedInvUpdate = true;
}
////////////////////////////////////////////////////////////
/// Set the rectangle defining the view
////////////////////////////////////////////////////////////
void View::SetRect(const FloatRect& Rect)
{
SetRect(Rect.GetCenter(), Rect.GetSize());
}
////////////////////////////////////////////////////////////
/// Change the center of the view (take 2 values)
/// Change the center of the view
////////////////////////////////////////////////////////////
void View::SetCenter(float X, float Y)
{
@ -86,7 +85,7 @@ void View::SetCenter(float X, float Y)
////////////////////////////////////////////////////////////
/// Change the center of the view (take a vector)
/// Change the center of the view
////////////////////////////////////////////////////////////
void View::SetCenter(const Vector2f& Center)
{
@ -95,7 +94,7 @@ void View::SetCenter(const Vector2f& Center)
////////////////////////////////////////////////////////////
/// Change the size of the view (take 2 values)
/// Change the size of the view
////////////////////////////////////////////////////////////
void View::SetSize(float Width, float Height)
{
@ -107,7 +106,7 @@ void View::SetSize(float Width, float Height)
////////////////////////////////////////////////////////////
/// Change the size of the view (take a vector)
/// Change the size of the view
////////////////////////////////////////////////////////////
void View::SetSize(const Vector2f& Size)
{
@ -116,15 +115,25 @@ void View::SetSize(const Vector2f& Size)
////////////////////////////////////////////////////////////
/// Get the rectangle defining the view,
/// which is the combined center and size.
/// Set the angle of rotation of the view
////////////////////////////////////////////////////////////
FloatRect View::GetRect() const
void View::SetRotation(float Angle)
{
return FloatRect(myCenter.x - mySize.x / 2,
myCenter.y - mySize.y / 2,
myCenter.x + mySize.x / 2,
myCenter.y + mySize.y / 2);
myRotation = Angle;
myNeedUpdate = true;
myNeedInvUpdate = true;
}
////////////////////////////////////////////////////////////
/// Reset the view to the given rectangle
////////////////////////////////////////////////////////////
void View::Reset(const FloatRect& Rectangle)
{
myCenter = Rectangle.GetCenter();
mySize = Rectangle.GetSize();
myNeedUpdate = true;
myNeedInvUpdate = true;
}
@ -147,7 +156,7 @@ const Vector2f& View::GetSize() const
////////////////////////////////////////////////////////////
/// Move the view (take 2 values)
/// Move the view
////////////////////////////////////////////////////////////
void View::Move(float OffsetX, float OffsetY)
{
@ -159,7 +168,7 @@ void View::Move(float OffsetX, float OffsetY)
////////////////////////////////////////////////////////////
/// Move the view (take a vector)
/// Move the view
////////////////////////////////////////////////////////////
void View::Move(const Vector2f& Offset)
{
@ -167,17 +176,26 @@ void View::Move(const Vector2f& Offset)
}
////////////////////////////////////////////////////////////
/// Rotate the view
////////////////////////////////////////////////////////////
void View::Rotate(float Angle)
{
myRotation += Angle;
myNeedUpdate = true;
myNeedInvUpdate = true;
}
////////////////////////////////////////////////////////////
/// Resize the view rectangle to simulate a zoom / unzoom effect
////////////////////////////////////////////////////////////
void View::Zoom(float Factor)
{
if (Factor != 0)
{
mySize /= Factor;
myNeedUpdate = true;
myNeedInvUpdate = true;
}
mySize.x *= Factor;
mySize.y *= Factor;
myNeedUpdate = true;
myNeedInvUpdate = true;
}
@ -189,7 +207,7 @@ const Matrix3& View::GetMatrix() const
// Recompute the matrix if needed
if (myNeedUpdate)
{
myMatrix.SetFromProjection(GetRect());
myMatrix.SetFromProjection(myCenter, mySize, myRotation);
myNeedUpdate = false;
}