[QNX]绘制一个正弦波

来源：互联网发布：自适应滤波算法院士编辑：程序博客网时间：2024/04/29 19:08

效果图
绘制一个正弦波

实现代码

#define N_SAMPLE 100 // 波长最大值#define AMP_MAX   50 // 振幅最大值/* * amplitude  —— 振幅 * wavelength —— 波长 */int sin_wave(int amplitude, int wavelength) {    int i = 0;    int value_array[N_SAMPLE] = { 0 };    if (wavelength > N_SAMPLE)  wavelength = N_SAMPLE;    if (amplitude > AMP_MAX)  amplitude = AMP_MAX;    for (i = 0; i < N_SAMPLE; i++) {        value_array[i] = (int) amplitude * sin((atan(1) * 8 * (i % wavelength)) / wavelength) + AMP_MAX;    }    PtMTrendAddData(ABW_PtMTrend_data, 0, value_array, N_SAMPLE );    return 0;}int mtrend_init(void) {    PtMTrendAttr_t graph1_attr = { Pt_MTREND_STATE_SHOWN, Pg_RED, 3, Pg_MITER_JOIN, 0, AMP_MAX*2, NULL, { 0, 0, 0, 0 } };    PtArg_t args[4];    int i = 0;    PtSetArg( &args[i++], Pt_ARG_MTREND_N_GRAPHS, 1, 0 );    PtSetArg( &args[i++], Pt_ARG_MTREND_N_SAMPLES, N_SAMPLE, 0 );    PtSetArg( &args[i++], Pt_ARG_MTREND_FLAGS, Pt_TRUE, Pt_MTREND_BLIT );    PtSetArg( &args[i++], Pt_ARG_MTREND_GRAPH_ATTR, &graph1_attr, 0 );    PtSetResources(ABW_PtMTrend_data, 4, args);}

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