41223251 cp2023

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w7

#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>

#define WHITE 255, 255, 255
#define RED 255, 0, 0

void draw_japan_flag(gdImagePtr img);

int main() {
    int width = 600;  // 國旗寬度
    int height = 400; // 國旗高度

    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);

    // Draw white background
    gdImageFilledRectangle(img, 0, 0, width, height, gdImageColorAllocate(img, WHITE));

    // Draw red circle
    int circle_radius = height / 4;
    int circle_x = width / 2;
    int circle_y = height / 2;

    gdImageFilledEllipse(img, circle_x, circle_y, circle_radius * 2, circle_radius * 2, gdImageColorAllocate(img, 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() {
    // 設置國旗的寬和高
    int width = 1200;
    int height = width / 2;

    // 創建圖像
    gdImagePtr img = gdImageCreateTrueColor(width, height);
    gdImageAlphaBlending(img, 0);

    // 繪製英國國旗
    draw_uk_flag(img);

    // 將圖像保存到文件
    FILE *outputFile = fopen("uk_flag.png", "wb");
    if (outputFile == NULL) {
        fprintf(stderr, "打開輸出文件時發生錯誤。\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);    // 紅色
    white = gdImageColorAllocate(img, 255, 255, 255); // 白色
    blue = gdImageColorAllocate(img, 0, 32, 91);     // 藍色

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

    int line_thickness = 100;
    gdImageSetThickness(img, line_thickness);

    // 繪製白色斜線
    gdImageLine(img, 0, height, width, 0, white);
    gdImageLine(img, 0, 0, width, height, white);

    line_thickness = 33;
    gdImageSetThickness(img, line_thickness);

    // 繪製紅色斜線
    gdImageLine(img, 566, 300, 1166, 0, red);
    gdImageLine(img, 1233, height, 633, 300, red);
    gdImageLine(img, 566, 300, -33, 0, red);
    gdImageLine(img, 600, 316.5, 0, 616.5, red);

    line_thickness = 33;
    gdImageSetThickness(img, line_thickness);

    // 繪製斜線
    gdImageLine(img, 0, height, width, 0, red);
    gdImageLine(img, width, 16.5, 600, 316.5, white);
    gdImageLine(img, 0, 583.5, 600, 283.5, white);

    // 繪製白色十字
    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);

    // 繪製紅色十字
    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);
}


w12 << Previous Next >> w14

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