/*?The?documentation?for?camera?is?in?the?header?file?camera.h.?*/

#include?
#include?
#include?
#include?

//?NOTE:?the?“static“?modifier?means?that?the?variable?or?function?is?private?to?this?file.

???static?double?eyex?=?0?eyey?=?0?eyez?=?30;
???static?double?refx?=?0?refy?=?0?refz?=?0;
???static?double?upx?=?0?upy?=?1?upz?=?0;
???
???static?double?xminRequested?=?-5?xmaxRequested?=?5;
???static?double?yminRequested?=?-5?ymaxRequested?=?5;
???static?double?zmin?=?-10?zmax?=?10;
???static?int?orthographic?=?0;
???static?int?preserveAspect?=?1;
???
???static?double?xminActual?xmaxActual?yminActual?ymaxActual;
???
???void?cameraSetOrthographic（int?ortho）?{
??????orthographic?=?ortho;
???}

???void?cameraSetPreserveAspect（int?preserve）?{
??????preserveAspect?=?preserve;
???}

???void?cameraSetLimits（double?xmin?double?xmax?double?ymin?double?ymax?double?zmin1?double?zmax1）?{
??????xminRequested?=?xminActual?=?xmin;
??????xmaxRequested?=?xmaxActual?=?xmax;
??????yminRequested?=?yminActual?=?ymin;
??????ymaxRequested?=?ymaxActual?=?ymax;
??????zmin?=?zmin1;
??????zmax?=?zmax1;
???}
???
???void?cameraSetScale（double?limit）?{
??????cameraSetLimits（-limitlimit-limitlimit-2*limit2*limit）;
???}
???
???void?cameraLookAt（double?eyeX?double?eyeY?double?eyeZ
????????????????????????double?viewCenterX?double?viewCenterY?double?viewCenterZ
????????????????????????double?viewUpX?double?viewUpY?double?viewUpZ）?{
??????eyex?=?eyeX;
??????eyey?=?eyeY;
??????eyez?=?eyeZ;
??????refx?=?viewCenterX;
??????refy?=?viewCenterY;
??????refz?=?viewCenterZ;
??????upx?=?viewUpX;
??????upy?=?viewUpY;
??????upz?=?viewUpZ;
???}

????static?double?norm（double?v0?double?v1?double?v2）?{
????????double?norm2?=?v0*v0?+?v1*v1?+?v2*v2;
????????return?sqrt（norm2）;
????}

????static?void?normalize（double?v[]）?{
????????double?n?=?norm（v[0]v[1]v[2]）;
????????v[0]?/=?n;
????????v[1]?/=?n;
????????v[2]?/=?n;
????}

???void?cameraApply（）?{
????????int?viewport[4];
????????glGetIntegerv（GL_VIEWPORT?viewport）;
????????xminActual?=?xminRequested;
????????xmaxActual?=?xmaxRequested;
????????yminActual?=?yminRequested;
????????ymaxActual?=?ymaxRequested;
????????if?（preserveAspect）?{
???????????double?viewWidth?=?viewport[2];
???????????double?viewHeight?=?viewport[3];
???????????double?windowWidth?=?xmaxActual?-?xminActual;
???????????double?windowHeight?=?ymaxActual?-?yminActual;
???????????double?aspect?=?viewHeight?/?viewWidth;
???????????double?desired?=?windowHeight?/?windowWidth;
???????????if?（desired?>?aspect）?{?//expand?width
???????????????double?extra?=?（desired?/?aspect?-?1.0）?*?（xmaxActual?-?xminActual）?/?2.0;
???????????????xminActual?-=?extra;
???????????????xmaxActual?+=?extra;
???????????}?else?if?（aspect?>?desired）?{
???????????????double?extra?=?（aspect?/?desired?-?1.0）?*?（ymaxActual?-?yminActual）?/?2.0;
???????????????yminActual?-=?extra;?
???????????????ymaxActual?+=?extra;
???????????}
????????

?屬性????????????大小?????日期????時間???名稱
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?????目錄???????????0??2018-01-04?20:36??graphicsbook-1.2-web-site\
?????目錄???????????0??2018-01-04?20:36??graphicsbook-1.2-web-site\c6\
?????文件????????1775??2018-01-04?20:36??graphicsbook-1.2-web-site\c6\affine-transform-matrix-2d.png
?????文件????????4719??2018-01-04?20:36??graphicsbook-1.2-web-site\c6\rgb-triangle-webgl.png
?????文件???????17365??2018-01-04?20:36??graphicsbook-1.2-web-site\c6\s5.html
?????文件???????12524??2018-01-04?20:36??graphicsbook-1.2-web-site\c6\nested-squares.png
?????文件??????270691??2018-01-04?20:36??graphicsbook-1.2-web-site\c6\cubemap-fisheye.png
?????文件???????42521??2018-01-04?20:36??graphicsbook-1.2-web-site\c6\s3.html
?????文件???????50693??2018-01-04?20:36??graphicsbook-1.2-web-site\c6\s4.html
?????文件??????386385??2018-01-04?20:36??graphicsbook-1.2-web-site\c6\multi-texture.png
?????文件????????5815??2018-01-04?20:36??graphicsbook-1.2-web-site\c6\index.html
?????文件???????11286??2018-01-04?20:36??graphicsbook-1.2-web-site\c6\textures-from-pixels.png
?????文件???????19978??2018-01-04?20:36??graphicsbook-1.2-web-site\c6\webgl-dataflow.png
?????文件???????66294??2018-01-04?20:36??graphicsbook-1.2-web-site\c6\texture-units-and-objects.png
?????文件???????45740??2018-01-04?20:36??graphicsbook-1.2-web-site\c6\s2.html
?????文件???????52662??2018-01-04?20:36??graphicsbook-1.2-web-site\c6\s1.html
?????目錄???????????0??2018-01-04?20:36??graphicsbook-1.2-web-site\c2\
?????文件???????51645??2018-01-04?20:36??graphicsbook-1.2-web-site\c2\s6.html
?????文件???????56822??2018-01-04?20:36??graphicsbook-1.2-web-site\c2\scene-graph.png
?????文件???????14222??2018-01-04?20:36??graphicsbook-1.2-web-site\c2\convexity.png
?????文件???????24529??2018-01-04?20:36??graphicsbook-1.2-web-site\c2\pixel-coordinates.png
?????文件???????45342??2018-01-04?20:36??graphicsbook-1.2-web-site\c2\filled-shapes.png
?????文件????????8016??2018-01-04?20:36??graphicsbook-1.2-web-site\c2\antialiased-line.png
?????文件???????44485??2018-01-04?20:36??graphicsbook-1.2-web-site\c2\s7.html
?????文件????????9777??2018-01-04?20:36??graphicsbook-1.2-web-site\c2\old-to-new-coords.png
?????文件????????4733??2018-01-04?20:36??graphicsbook-1.2-web-site\c2\line-attributes.png
?????文件???????47131??2018-01-04?20:36??graphicsbook-1.2-web-site\c2\RotatedStringAndImage.jpg
?????文件????????9438??2018-01-04?20:36??graphicsbook-1.2-web-site\c2\ovals.png
?????文件???????51793??2018-01-04?20:36??graphicsbook-1.2-web-site\c2\s5.html
?????文件????????5220??2018-01-04?20:36??graphicsbook-1.2-web-site\c2\cart.png
?????文件????????1617??2018-01-04?20:36??graphicsbook-1.2-web-site\c2\hierarchical-animation.svg
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