matrixrotate.c

来自「Simple Cube plotting using frame buffers」· C语言 代码 · 共 31 行

#include <math.h>
#include "matrixRotate.h"


inline void rotateX(float *out, float angle){

vector float* outV = (vector float*) out;
outV[0] = (vector float) { 1.0f, 0.0f, 0.0f, 0.0f };
outV[1] = (vector float) { 0.0f, cosf(angle), sinf(angle), 0.0f };
outV[2] = (vector float) { 0.0f, -sinf(angle), cos(angle), 0.0f };
outV[3] = (vector float) { 0.0f, 0.0f, 0.0f, 1.0f };
}

inline void rotateY(float *out, float angle){

vector float* outV = (vector float*) out;
outV[0] = (vector float) { cosf(angle), 0.0f, -sinf(angle), 0.0f };
outV[1] = (vector float) { 0.0f, 1.0f, 0.0f, 0.0f };
outV[2] = (vector float) { sinf(angle), 0, cosf(angle), 0.0f };
outV[3] = (vector float) { 0.0f, 0.0f, 0.0f, 1.0f };
}

inline void rotateZ(float *out, float angle){

vector float* outV = (vector float*) out;
outV[0] = (vector float) { cosf(angle), sinf(angle), 0.0f, 0.0f };
outV[1] = (vector float) { -sinf(angle), cos(angle), 0.0f, 0.0f };
outV[2] = (vector float) { 0.0f, 0.0f, 1.0f, 0.0f };
outV[3] = (vector float) { 0.0f, 0.0f, 0.0f, 1.0f };
}