绘制纹理C++

用数学和C++绘制一些纹理

sin(x * x + y * y)

int main() {int width = 400; // 宽度int height = 400; // 高度Mat texture = Mat::zeros(height, width, CV_8UC1);for (int y = 0; y < height; ++y) {for (int x = 0; x < width; ++x) {int value = static_cast<int>(255 * sin(x * x + y * y));texture.at<uchar>(y, x) = static_cast<uchar>(value);}}imshow("Generated Texture", texture);imwrite("D:\\doc\\image\\sin(xx+yy).jpg", texture);waitKey(0);return 0;
}

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交错斜线

 // 生成交错斜线风格的黑白纹理for (int y = 0; y < height; ++y) {for (int x = 0; x < width; ++x) {if ((x + y) % 20 < 10) {texture.at<uchar>(y, x) = 255; // 白色}else {texture.at<uchar>(y, x) = 0; // 黑色}}}

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竖纹

int width = 400; // 宽度
int height = 400; // 高度Mat texture = Mat::zeros(height, width, CV_8UC1);for (int y = 0; y < height; ++y) {for (int x = 0; x < width; ++x) {int value = static_cast<int>(255 * 0.5 * (1 + sin(2 * M_PI * x / 20)));//竖纹}
}

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交错方块

int width = 400; // 宽度
int height = 400; // 高度Mat texture = Mat::zeros(height, width, CV_8UC1);for (int y = 0; y < height; ++y) {for (int x = 0; x < width; ++x) {int value = static_cast<int>(255 * 0.5 * (1 + sin(2 * M_PI * x / 20) * sin(2 * M_PI * y / 20)));}
}

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sin(abs(x)) + sin(abs(y))

int width = 400; // 宽度
int height = 400; // 高度Mat texture = Mat::zeros(height, width, CV_8UC1);for (int y = 0; y < height; ++y) {for (int x = 0; x < width; ++x) {int value = static_cast<int>(255 * (sin(abs(x)) + sin(abs(y)))) ;}
}

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sin(x)*sin(y)

int width = 400; // 宽度
int height = 400; // 高度Mat texture = Mat::zeros(height, width, CV_8UC1);for (int y = 0; y < height; ++y) {for (int x = 0; x < width; ++x) {int value = static_cast<int>(255 * ( sin(x)*sin(y) )) ;}
}

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花纹1

公式坐标系下的函数： r=sin(n*t)

for (int y = 0; y < height; ++y) {for (int x = 0; x < width; ++x) {int curx = x % 50;int cury = y % 50;originX = x/50+25;originY = y/50+25;float t = atan2(cury - originY, curx - originX);float r = sqrt((curx - originX) * (curx - originX) + (cury - originY) * (cury - originY));float functionValue = sin(n * t);if (abs(r - functionValue * 20) < 5) // 乘以20是为了放大图像{texture.at<uchar>(y, x) = static_cast<uchar>(200);}}
}

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花纹2

void drawFunction() {// 创建一个空白图像int width = 200;int height = 200;cv::Mat image(height, width, CV_8UC3, cv::Scalar(255, 255, 255));// 设置极坐标参数int numPoints = max(width, height)*2;double radius = min(width, height)/4;// 绘制极坐标曲线for (int i = 0; i < numPoints; ++i) {double angle = 2 * CV_PI * i / numPoints;int x = static_cast<int>(radius * (cos(angle) +cos(angle*8)/2 + sin(0*angle) / 3)) + width / 2; // 将坐标平移到图像中心int y = static_cast<int>(radius * (sin(angle) +sin(angle*8)/2 + cos(0*angle)/3)) + height / 2; // 将坐标平移到图像中心if (x+1 >= 0 && x+1 < width && y+1 >= 0 && y+1 < height) {image.at<cv::Vec3b>(y, x) = cv::Vec3b(0, 0, 0); // 绘制像素点image.at<cv::Vec3b>(y+1, x) = cv::Vec3b(0, 0, 0); // 绘制像素点image.at<cv::Vec3b>(y, x + 1) = cv::Vec3b(0, 0, 0); // 绘制像素点image.at<cv::Vec3b>(y + 1, x + 1) = cv::Vec3b(0, 0, 0); // 绘制像素点}}imshow("Generated Texture", image);imwrite("D:\\code\\noise\\image\\polar_plot.jpg", image);waitKey(0);}

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https://www.zhihu.com/zvideo/1471926178575970304

叠加

void drawFunction() {// 创建一个空白图像int width = 200;int height = 200;cv::Mat image(height, width, CV_8UC3, cv::Scalar(255, 255, 255));// 设置极坐标参数int numPoints = max(width, height)*4;double radius = min(width, height)/4;// 绘制极坐标曲线for (int i = 0; i < numPoints; ++i) {double angle = 2 * CV_PI * i / numPoints;double tempx = cos(angle) + cos(angle * 8) / 2 + sin(0 * angle) / 3;double tempy = sin(angle) + sin(angle * 8) / 2 + cos(0 * angle) / 3;int x = static_cast<int>(radius * (tempx)) + width / 2; // 将坐标平移到图像中心int y = static_cast<int>(radius * (tempy)) + height / 2; // 将坐标平移到图像中心if (x+1 >= 0 && x+1 < width && y+1 >= 0 && y+1 < height) {image.at<cv::Vec3b>(y, x) = cv::Vec3b(0, 0, 0); // 绘制像素点//image.at<cv::Vec3b>(y+1, x) = cv::Vec3b(0, 0, 0); // 绘制像素点//image.at<cv::Vec3b>(y, x + 1) = cv::Vec3b(0, 0, 0); // 绘制像素点//image.at<cv::Vec3b>(y + 1, x + 1) = cv::Vec3b(0, 0, 0); // 绘制像素点}x = static_cast<int>(radius * (tempx)*0.8) + width / 2; // 将坐标平移到图像中心y = static_cast<int>(radius * (tempy) * 0.8) + height / 2; // 将坐标平移到图像中心if (x + 1 >= 0 && x + 1 < width && y + 1 >= 0 && y + 1 < height) {image.at<cv::Vec3b>(y, x) = cv::Vec3b(0, 0, 0); // 绘制像素点//image.at<cv::Vec3b>(y + 1, x) = cv::Vec3b(0, 0, 0); // 绘制像素点//image.at<cv::Vec3b>(y, x + 1) = cv::Vec3b(0, 0, 0); // 绘制像素点//image.at<cv::Vec3b>(y + 1, x + 1) = cv::Vec3b(0, 0, 0); // 绘制像素点}x = static_cast<int>(radius * (tempx) * 0.618) + width / 2; // 将坐标平移到图像中心y = static_cast<int>(radius * (tempy) * 0.618) + height / 2; // 将坐标平移到图像中心if (x + 1 >= 0 && x + 1 < width && y + 1 >= 0 && y + 1 < height) {image.at<cv::Vec3b>(y, x) = cv::Vec3b(0, 0, 0); // 绘制像素点//image.at<cv::Vec3b>(y + 1, x) = cv::Vec3b(0, 0, 0); // 绘制像素点//image.at<cv::Vec3b>(y, x + 1) = cv::Vec3b(0, 0, 0); // 绘制像素点//image.at<cv::Vec3b>(y + 1, x + 1) = cv::Vec3b(0, 0, 0); // 绘制像素点}x = static_cast<int>(radius * (tempx) * 0.4) + width / 2; // 将坐标平移到图像中心y = static_cast<int>(radius * (tempy) * 0.4) + height / 2; // 将坐标平移到图像中心if (x + 1 >= 0 && x + 1 < width && y + 1 >= 0 && y + 1 < height) {image.at<cv::Vec3b>(y, x) = cv::Vec3b(0, 0, 0); // 绘制像素点//image.at<cv::Vec3b>(y + 1, x) = cv::Vec3b(0, 0, 0); // 绘制像素点//image.at<cv::Vec3b>(y, x + 1) = cv::Vec3b(0, 0, 0); // 绘制像素点//image.at<cv::Vec3b>(y + 1, x + 1) = cv::Vec3b(0, 0, 0); // 绘制像素点}}imshow("Generated Texture", image);imwrite("D:\\code\\noise\\image\\polar_plot.jpg", image);waitKey(0);}