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DrawClipped

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This commit is contained in:
James Turk 2003-09-01 00:22:27 +00:00
parent 429ed5c43d
commit a9c641bc9d
2 changed files with 50 additions and 2 deletions
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14
include/ZE_ZImage.h
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@ -13,7 +13,7 @@
\brief Definition file for ZImage. \brief Definition file for ZImage.
Definition file for ZImage, the OpenGL version of the ZImage class for ZEngine. Definition file for ZImage, the OpenGL version of the ZImage class for ZEngine.
<br>$Id: ZE_ZImage.h,v 1.22 2003/08/07 05:54:45 cozman Exp $<br> <br>$Id: ZE_ZImage.h,v 1.23 2003/09/01 00:22:27 cozman Exp $<br>
\author James Turk \author James Turk
**/ **/
@ -21,6 +21,7 @@
#define __ze_zimage_h__ #define __ze_zimage_h__
#include "ZE_ZEngine.h" #include "ZE_ZEngine.h"
#include "ZE_ZRect.h"
namespace ZE namespace ZE
{ {
@ -246,6 +247,17 @@ class ZImage
**/ **/
void DrawRotated(float x, float y, float angle) const; void DrawRotated(float x, float y, float angle) const;
/*!
\brief Draw Clipped Image to screen.
Image is drawn such that only portions of image which fall within a certain area appear.
\since 0.8.5
\param x X coord to draw Image to.
\param y Y coord to draw Image to.
\param clipRect Rectangle to clip within.
**/
void DrawClipped(float x, float y, ZRect clipRect) const;
/*! /*!
\brief Flip image over one or both axes. \brief Flip image over one or both axes.

38
src/ZE_ZImage.cpp
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@ -13,7 +13,7 @@
\brief Source file for ZImage. \brief Source file for ZImage.
Implementation of ZImage, the Image class for ZEngine. Implementation of ZImage, the Image class for ZEngine.
<br>$Id: ZE_ZImage.cpp,v 1.41 2003/08/08 03:52:25 cozman Exp $<br> <br>$Id: ZE_ZImage.cpp,v 1.42 2003/09/01 00:22:35 cozman Exp $<br>
\author James Turk \author James Turk
**/ **/
@ -237,6 +237,42 @@ void ZImage::DrawRotated(float x, float y, float angle) const
glPopMatrix(); glPopMatrix();
} }
void ZImage::DrawClipped(float x, float y, ZRect clipRect) const
{
ZRect imgRect(x,y,rWidth,rHeight),inRect;
float xDiff,yDiff,nx,ny,nw,nh;
xDiff = rTexMaxX - rTexMinX;
yDiff = rTexMaxY - rTexMinY;
if(clipRect.Contains(imgRect))
{
Draw(x,y);
}
else if(clipRect.Intersects(imgRect))
{
inRect = clipRect.Intersection(imgRect);
nx = rTexMinX + (inRect.X()-imgRect.X())/imgRect.Width()*xDiff;
ny = rTexMinY + (inRect.Y()-imgRect.Y())/imgRect.Height()*yDiff;
nw = nx + (inRect.Width()/imgRect.Width())*xDiff;
nh = ny + (inRect.Height()/imgRect.Height())*yDiff;
glColor4ub(255,255,255,rAlpha); //sets the color correctly
Bind();
glBegin(GL_TRIANGLE_STRIP);
glTexCoord2f(nx,ny); glVertex2f(inRect.Left(),inRect.Top());
glTexCoord2f(nw,ny); glVertex2f(inRect.Right(),inRect.Top());
glTexCoord2f(nx,nh); glVertex2f(inRect.Left(),inRect.Bottom());
glTexCoord2f(nw,nh); glVertex2f(inRect.Right(),inRect.Bottom());
glEnd();
glColor4ub(255,255,255,255); //be responsible, return to standard color state
}
else //doesn't contain nor intersect
{
//draw nothing
}
}
void ZImage::Flip(bool horizontal, bool vertical) void ZImage::Flip(bool horizontal, bool vertical)
{ {
GLfloat temp; GLfloat temp;