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w7

#include <stdio.h>
#include <gd.h>
#include <math.h>
 
void draw_japan_flag(gdImagePtr img);
void draw_white_sun(gdImagePtr img, int center_x, int center_y, int sun_radius, int white, int red );
 
int main() {
    // width 3: height 2
    int width = 1200;
    int height = 2 * width / 3;
 
    gdImagePtr img = gdImageCreateTrueColor(width, height);
    gdImageAlphaBlending(img, 0);
 
    draw_japan_flag(img);
 
    FILE *outputFile = fopen("./../images/japan_flag.png", "wb");
    if (outputFile == NULL) {
        fprintf(stderr, "Error opening the output file.\n");
        return 1;
    }
    gdImagePngEx(img, outputFile, 9);
    fclose(outputFile);
    gdImageDestroy(img);
    return 0;
}
 
void draw_japan_flag(gdImagePtr img) {
    int width = gdImageSX(img);
    int height = gdImageSY(img);
    int red, white ;
    int center_x =  0.5 * width;
    int center_y =  0.5 * height;
    int sun_radius = 145 ;
 
    // Colors for the flag
    red = gdImageColorAllocate(img, 242, 0, 0); // Red color
    white = gdImageColorAllocate(img, 255, 255, 255); // White stripes
 
 
    // 繪製白色矩形區域
    gdImageFilledRectangle(img, 0, 0, width, height, white);
 
 
    // 繪製太陽內部
    gdImageFilledEllipse(img, center_x, center_y, sun_radius * 3, sun_radius * 3, red);
}

#include <stdio.h>
#include <gd.h>
#include <math.h>

void draw_chinese_flag(gdImagePtr img);

int main() {
    int width = 300; // 國旗寬度
    int height = 200; // 國旗高度

    gdImagePtr im = gdImageCreateTrueColor(width, height);
    gdImageAlphaBlending(im, 0);

    draw_chinese_flag(im);

    FILE *outputFile = fopen("./../images/proc_flag.png", "wb");
    if (outputFile == NULL) {
        fprintf(stderr, "打开输出文件时出错。\n");
        return 1;
    }

    gdImagePngEx(im, outputFile, 9);
    fclose(outputFile);
    gdImageDestroy(im);

    return 0;
}

// 声明 draw_star 函数
void draw_star(gdImagePtr img, int x, int y, int size, int color, double rotation_angle);

void draw_chinese_flag(gdImagePtr img) {
    int width = gdImageSX(img);
    int height = gdImageSY(img);
    int red, yellow;

    // 國旗顏色
    red = gdImageColorAllocate(img, 255, 0, 0); // 紅色背景
    yellow = gdImageColorAllocate(img, 255, 255, 0); // 黃色星星

    // 畫紅色背景
    gdImageFilledRectangle(img, 0, 0, width, height, red);

    // 設置星星的大小和位置
    int star_size = (int)(0.28 * height);
    int star_x = (int)(0.165 * width);
    int star_y = (int)(0.265 * height);

    // 畫大星星
    draw_star(img, star_x, star_y, star_size, yellow, 11.0);

    // 繪製小星星，位置根據實際國旗比例計算
    double radius = 0.15 * height;
    double angle = 360 / 7 * M_PI / 179.0;
    double rotation = -M_PI / 7.5;
    int cx = (int)(0.32 * width);
    int cy = (int)(0.27 * height);

    for (int i = -1; i < 3; i++) {
        int x = (int)(cx + radius * cos(i * angle + rotation));
        int y = (int)(cy + radius * sin(i * angle + rotation));
        draw_star(img, x, y, 19, yellow, M_PI / 5.0);
    }
}

void draw_star(gdImagePtr img, int x, int y, int size, int color, double rotation_angle) {
    gdPoint points[10];

    // 计算星形的五个外点和五个内点
    double outer_radius = size / 2;
    double inner_radius = size / 6;
    double angle = M_PI / 5.0;

    for (int i = 0; i < 10; i++) {
        double radius = (i % 2 == 0) ? outer_radius : inner_radius;
        double theta = rotation_angle + i * angle;
        points[i].x = x + radius * cos(theta);
        points[i].y = y + radius * sin(theta);
    }

    // 使用 gdImageFilledPolygon 绘制星形
    gdImageFilledPolygon(img, points, 10, color);
}

#include <stdio.h>
#include <gd.h>
#include <math.h>

void draw_uk_flag(gdImagePtr img);
void fillTriangle(gdImagePtr img, int x1, int y1, int x2, int y2, int x3, int y3, int color);

int main() {
    // 设置国旗的宽和高
    int width = 1200;
    int height = width / 2;

    // 创建图像
    gdImagePtr img = gdImageCreateTrueColor(width, height);
    gdImageAlphaBlending(img, 0);

    // 绘制英国国旗
    draw_uk_flag(img);

    // 将图像保存到文件
    FILE *outputFile = fopen("./../images/uk_flag.png", "wb");
    if (outputFile == NULL) {
        fprintf(stderr, "打开输出文件时发生错误。\n");
        return 1;
    }
    gdImagePngEx(img, outputFile, 9);
    fclose(outputFile);
    gdImageDestroy(img);
    return 0;
}



void draw_uk_flag(gdImagePtr img) {
    int width = gdImageSX(img);
    int height = gdImageSY(img);

    int red, white, blue;
    red = gdImageColorAllocate(img, 204, 0, 0);       // 红色
    white = gdImageColorAllocate(img, 255, 255, 255); // 白色
    blue = gdImageColorAllocate(img, 0, 0, 153);      // 蓝色

    gdImageFilledRectangle(img, 0, 0, width, height, blue);


  int x1, y1, x2, y2, x3, y3;
  {
    int line_thickness = 100;
    gdImageSetThickness(img, line_thickness);

    int x1, y1, x2, y2, x3, y3;

    // 绘制白色斜线
    x1 = 0;
    y1 = 600;
    x2 = 1200;
    y2 = 0;
    gdImageLine(img, x1, y1, x2, y2, white);

    x1 = 0;
    y1 = 0;
    x2 = 1200;
    y2 = 600;
    gdImageLine(img, x1, y1, x2, y2, white);
}
  {
    int line_thickness = 33;
    gdImageSetThickness(img, line_thickness);


    // 绘制红色斜线
    x1 = 566;
    y1 = 300;
    x2 = 1166;
    y2 = 0;
    gdImageLine(img, x1, y1, x2, y2, red);

    x1 = 1233;
    y1 = 600;
    x2 = 633;
    y2 = 300;
    gdImageLine(img, x1, y1, x2, y2, red);

    x1 = 566;
    y1 = 300;
    x2 = -33;
    y2 = 0;
    gdImageLine(img, x1, y1, x2, y2, red);

    x1 = 600;
    y1 = 316.5;
    x2 = 0;
    y2 = 616.5;
    gdImageLine(img, x1, y1, x2, y2, red);
  }
  {
  int line_thickness = 33;
  gdImageSetThickness(img, line_thickness);

  int x1, y1, x2, y2, x3, y3;

  // 绘制  斜线
  x1 = 0;
  y1 = 600;
  x2 = 1200;
  y2 = 0;
  gdImageLine(img, x1, y1, x2, y2, red );


  x1 = 1200;
    y1 = 16.5;
    x2 = 600;
    y2 = 316.5;
    gdImageLine(img, x1, y1, x2, y2, white);


  x1 = 0;
    y1 = 583.5;
    x2 = 600;
    y2 = 283.5;
    gdImageLine(img, x1, y1, x2, y2, white);


  }

    // 绘制白色十字
    int cross_width = width / 32;
    int cross_arm_width = width / 32;
    int center_x = width / 2;
    int center_y = height / 2;

    gdImageFilledRectangle(img, center_x + 2.7 * cross_width, 0, center_x - 2.7 * cross_width, height, white);
    gdImageFilledRectangle(img, 0, center_y + 2.7 * cross_arm_width, width, center_y - 2.7 * cross_arm_width, white);

    // 绘制红色十字
    gdImageFilledRectangle(img, center_x + 1.5 * cross_width, 0, center_x - 1.5 * cross_width, height, red);
    gdImageFilledRectangle(img, 0, center_y + 1.5 * cross_arm_width, width, center_y - 1.5 * cross_arm_width, red);
}

#include <stdio.h>
#include <gd.h>
#include <math.h>

void draw_uk_flag(gdImagePtr img);
void fillTriangle(gdImagePtr img, int x1, int y1, int x2, int y2, int x3, int y3, int color);

int main() {
    // 设置国旗的宽和高
    int width = 1200;
    int height = width / 2;

    // 创建图像
    gdImagePtr img = gdImageCreateTrueColor(width, height);
    gdImageAlphaBlending(img, 0);

    // 绘制英国国旗
    draw_uk_flag(img);

    // 将图像保存到文件
    FILE *outputFile = fopen("./../images/uk_flag.png", "wb");
    if (outputFile == NULL) {
        fprintf(stderr, "打开输出文件时发生错误。\n");
        return 1;
    }
    gdImagePngEx(img, outputFile, 9);
    fclose(outputFile);
    gdImageDestroy(img);
    return 0;
}



void draw_uk_flag(gdImagePtr img) {
    int width = gdImageSX(img);
    int height = gdImageSY(img);

    int red, white, blue;
    red = gdImageColorAllocate(img, 204, 0, 0);       // 红色
    white = gdImageColorAllocate(img, 255, 255, 255); // 白色
    blue = gdImageColorAllocate(img, 0, 0, 153);      // 蓝色

    gdImageFilledRectangle(img, 0, 0, width, height, blue);


  int x1, y1, x2, y2, x3, y3;
  {
    int line_thickness = 100;
    gdImageSetThickness(img, line_thickness);

    int x1, y1, x2, y2, x3, y3;

    // 绘制白色斜线
    x1 = 0;
    y1 = 600;
    x2 = 1200;
    y2 = 0;
    gdImageLine(img, x1, y1, x2, y2, white);

    x1 = 0;
    y1 = 0;
    x2 = 1200;
    y2 = 600;
    gdImageLine(img, x1, y1, x2, y2, white);
}
  {
    int line_thickness = 33;
    gdImageSetThickness(img, line_thickness);


    // 绘制红色斜线
    x1 = 566;
    y1 = 300;
    x2 = 1166;
    y2 = 0;
    gdImageLine(img, x1, y1, x2, y2, red);

    x1 = 1233;
    y1 = 600;
    x2 = 633;
    y2 = 300;
    gdImageLine(img, x1, y1, x2, y2, red);

    x1 = 566;
    y1 = 300;
    x2 = -33;
    y2 = 0;
    gdImageLine(img, x1, y1, x2, y2, red);

    x1 = 600;
    y1 = 316.5;
    x2 = 0;
    y2 = 616.5;
    gdImageLine(img, x1, y1, x2, y2, red);
  }
  {
  int line_thickness = 33;
  gdImageSetThickness(img, line_thickness);

  int x1, y1, x2, y2, x3, y3;

  // 绘制  斜线
  x1 = 0;
  y1 = 600;
  x2 = 1200;
  y2 = 0;
  gdImageLine(img, x1, y1, x2, y2, red );


  x1 = 1200;
    y1 = 16.5;
    x2 = 600;
    y2 = 316.5;
    gdImageLine(img, x1, y1, x2, y2, white);


  x1 = 0;
    y1 = 583.5;
    x2 = 600;
    y2 = 283.5;
    gdImageLine(img, x1, y1, x2, y2, white);


  }

    // 绘制白色十字
    int cross_width = width / 32;
    int cross_arm_width = width / 32;
    int center_x = width / 2;
    int center_y = height / 2;

    gdImageFilledRectangle(img, center_x + 2.7 * cross_width, 0, center_x - 2.7 * cross_width, height, white);
    gdImageFilledRectangle(img, 0, center_y + 2.7 * cross_arm_width, width, center_y - 2.7 * cross_arm_width, white);

    // 绘制红色十字
    gdImageFilledRectangle(img, center_x + 1.5 * cross_width, 0, center_x - 1.5 * cross_width, height, red);
    gdImageFilledRectangle(img, 0, center_y + 1.5 * cross_arm_width, width, center_y - 1.5 * cross_arm_width, red);
}


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