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/*
* PsychRects.c
*
* PLATFORMS:
*
* All.
*
* AUTHORS:
*
* Allen Ingling awi Allen.Ingling@nyu.edu
* Mario Kleiner mk mario.kleiner.de@gmail.com
*
* HISTORY:
*
* 02/11/03 awi Wrote it.
* 01/20/09 mk Modify behaviour of PsychGetCenterFromRectAbs(): No longer floor() the size of the rectangle
* before calculation of center: This removes information about rects with fractional locations
* for no reason. Function is currently used by FillOval, FrameOval, Frame/Fill/xxxArc(), where
* it has harmful effect on accuracy and consistency.
*
* DESCRIPTION:
*
* Helper to deal with common operations on rectangles.
*/
#include "Screen.h"
/*
* PsychMakeRect()
*
* Convenience function for assembling PsychRects. The caller alloctes the rect.
*/
void PsychMakeRect(double *psychRect, double left, double top, double right, double bottom)
{
psychRect[kPsychLeft]=left;
psychRect[kPsychTop]=top;
psychRect[kPsychRight]=right;
psychRect[kPsychBottom]=bottom;
}
/*
* Check that the left side is on the left and the top is on the top and
* the volume is >= 1 pixel.
*/
psych_bool IsPsychRectEmpty(PsychRectType rect)
{
return((rect[kPsychLeft] == rect[kPsychRight] || rect[kPsychTop]==rect[kPsychBottom]));
}
psych_bool ValidatePsychRect(double *rect)
{
if(rect[kPsychLeft] > rect[kPsychRight] || rect[kPsychTop]>rect[kPsychBottom])
return(FALSE);
return(TRUE);
}
/*
* PsychGetWidthFromRect()
*/
double PsychGetWidthFromRect(const double *rect)
{
return(rect[kPsychRight]-rect[kPsychLeft]);
}
/*
* PsychGetHeightFromRect()
*/
double PsychGetHeightFromRect(const double *rect)
{
return(rect[kPsychBottom]-rect[kPsychTop]);
}
/*
* PsychCenterRect()
*
* Centers one rect within the other. The caller should allocate memory for the return value.
*/
void PsychCenterRect(const double *innerRect, const double *outerRect, double *newRect)
{
double leftOffset, topOffset, rightOffset, bottomOffset;
rightOffset = innerRect[kPsychRight] - innerRect[kPsychLeft];
bottomOffset = innerRect[kPsychBottom] - innerRect[kPsychTop];
leftOffset = floor(((outerRect[kPsychRight] - outerRect[kPsychLeft] ) - rightOffset)/2);
topOffset = floor(((outerRect[kPsychBottom] - outerRect[kPsychTop] ) - bottomOffset)/2);
newRect[kPsychRight] = newRect[kPsychLeft] + rightOffset;
newRect[kPsychBottom] = newRect[kPsychTop] + bottomOffset;
newRect[kPsychLeft] = outerRect[kPsychLeft] + leftOffset;
newRect[kPsychTop] = outerRect[kPsychTop] + topOffset;
}
void PsychCenterRectInRect(const double *innerRect, const double *outerRect, double *newRect)
{
double innerWidth, innerHeight, outerWidth, outerHeight;
innerWidth=PsychGetWidthFromRect(innerRect);
innerHeight=PsychGetHeightFromRect(innerRect);
outerWidth=PsychGetWidthFromRect(outerRect);
outerHeight=PsychGetHeightFromRect(outerRect);
newRect[kPsychLeft]=floor((outerWidth - innerWidth) / 2.0);
newRect[kPsychTop]=floor((outerHeight - innerHeight) / 2.0);
newRect[kPsychRight]=newRect[kPsychLeft]+innerWidth;
newRect[kPsychBottom]=newRect[kPsychTop]+innerHeight;
}
/*
* PsychGetCenterFromRectAbs()
*
* For consistency in how we treat sides of an even number of pixels we should always use
* PsychGetCenterFromRect() when finding the center of a rect.
*
* We return the result in absolute coordinates i.e. we preserve offsets from the origin
*/
void PsychGetCenterFromRectAbsolute(const double *rect, double *rectCenterX, double *rectCenterY)
{
double rectWidth, rectHeight;
rectWidth=PsychGetWidthFromRect(rect);
rectHeight=PsychGetHeightFromRect(rect);
*rectCenterX=rect[kPsychLeft] + (rectWidth/2);
*rectCenterY=rect[kPsychTop] + (rectHeight/2);
}
void PsychCopyRect(double *toRect, const double *fromRect)
{
memcpy(toRect, fromRect, sizeof(PsychRectType));
}
/*
* PsychGetManhattanDistance()
*
* Find the offset between two points. The distance to travel from point 1 to point 2.
*
* The caller allocated deltaX and deltaY.
*/
void PsychGetManhattanDistance(double x1, double y1, double x2, double y2, double *deltaX, double *deltaY)
{
*deltaX=x2-x1;
*deltaY=y2-y1;
}
/*
* PsychNormalizeRect()
*
* Offsets rect to the origin, making left and top coordinates 0 and 0.
*/
void PsychNormalizeRect(double *rect, double *normRect)
{
// x
normRect[kPsychLeft]=(double) 0;
normRect[kPsychRight]=fabs(rect[kPsychRight]-rect[kPsychLeft]);
// y
normRect[kPsychTop]=(double) 0;
normRect[kPsychBottom]=fabs(rect[kPsychBottom]-rect[kPsychTop]);
}
/*
* PsychInverRectYInFrame()
*
* Convert the rect for and coordinate frame with an inverted Y axis.
*
* Calculate rectB given rectA within frameA. If rectA lies within coordinate frame frameA where the origin is at bottom left corner of the display, then
* rectB will be on the same screen position within coordinate frame frameB where the origin lies at the top left.
*
*/
void PsychInvertRectY(double *rectB, double *rectA, double *frameA)
{
double frameHeight, offset;
PsychCopyRect(rectB, rectA);
frameHeight=PsychGetHeightFromRect(frameA);
offset=frameHeight-PsychGetHeightFromRect(rectA);
rectB[kPsychBottom]=frameHeight - rectA[kPsychTop] - offset;
rectB[kPsychTop]=frameHeight - rectA[kPsychBottom] - offset;
}
psych_bool PsychMatchRect(double *rectA, double *RectB)
{
return (rectA[kPsychLeft] == RectB[kPsychLeft] &&
rectA[kPsychTop] == RectB[kPsychTop] &&
rectA[kPsychRight] == RectB[kPsychRight] &&
rectA[kPsychBottom] == RectB[kPsychBottom]);
}
/*
* PsychFindEnclosingTextureRect
*
* Except when using the GL_EXT_texture_rectangle, OpenGL textures must be have sides which are a power of two.
* Therefore, when we want to hold within a texture a graphic which does not meet that requirement, we find the
* smallest bounding rectangle with sides length 2^n still large enough to contain the graphic.
*
* The caller allocates enclosingRect.
*/
void PsychFindEnclosingTextureRect(double *rectA, double *enclosingRect)
{
double rectSides[2];
unsigned long newSides[2];
int s;
rectSides[0]=PsychGetWidthFromRect(rectA);
rectSides[1]=PsychGetHeightFromRect(rectA);
for(s = 0; s < 2; s++) {
for(newSides[s] = 1; newSides[s] < rectSides[s]; newSides[s] = newSides[s]<<1);
}
enclosingRect[kPsychLeft] = 0;
enclosingRect[kPsychTop] = 0;
enclosingRect[kPsychRight] = (double) newSides[0];
enclosingRect[kPsychBottom] = (double) newSides[1];
}
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