affinetransform __ccaffinetransformmake
(float a,
float b,
float c,
float d,
float tx,
float ty)
(const vec2& point,
const affinetransform& t)
(const vec2& point,
const mat4& transform)
(const size& size,
const affinetransform& t)
affinetransform affinetransformmakeidentity()
extern
const affinetransform affinetransformidentity =
affinetransformmakeidentity()
;const affinetransform affinetransform::identity =
affinetransformmakeidentity()
;//獲取仿射變換轉換之後的座標
(const rect& rect,
const affinetransform& anaffinetransform)
//直接獲取座標
(const rect& rect,
const mat4& transform)
// [ 1 0 0 ]
//[x y 1]* [ 0 1 0 ]
// [ tx ty 1 ]
//平移到(x+tx, y+ty, 1)
affinetransform affinetransformtranslate
(const affinetransform& t,
float tx,
float ty)
// [ a*sx 0 0 ]
//[x y 1]* [ 0 d*sy 0 ]
// [ 0 0 1 ]
//x座標縮放sx倍,y座標縮放sy倍
affinetransform affinetransformscale
(const affinetransform& t,
float sx,
float sy)
// [ cosa sina 0 ]
//[x y 1]* [ -sina cosa 0 ]
// [ 0 0 1 ]
//旋轉
affinetransform affinetransformrotate
(const affinetransform& t,
float anangle)
//將兩個矩陣相乘 得到第二個矩陣的xy軸在第乙個矩陣xy軸上的投影
//下面的引數化簡完就變成了
//[ a1*a2 0 0 ]
//[ 0 d1*d2 0 ]
//[ 0 0 0 ]
/* concatenate `t2' to `t1' and return the result:
t' = t1 * t2 */
affinetransform affinetransformconcat
(const affinetransform& t1,
const affinetransform& t2)
mat4 transformconcat
(const mat4& t1,
const mat4& t2)
///* return true if `t1' and `t2' are equal, false otherwise. */
bool
affinetransformequaltotransform
(const affinetransform& t1,
const affinetransform& t2)
//交換xy軸的值
//轉換為
//[ d 0 0 ]
//[ 0 a 0 ]
//[ 0 0 0 ]
affinetransform affinetransforminvert
(const affinetransform& t)
ns_cc_end
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