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說明基本 gd 繪圖 << Previous Next >> China flag Program Usage

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, "打開输出文件時出錯。\n");
        return 1;
    }

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

    return 0;
}

// 聲明 draw_star 函數
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];

    // 計算星形的五個外點和五個内點
    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 繪製星形
    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() {
    // 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("./../images/uk_flag.png", "wb");
    if (outputFile == NULL) {
        fprintf(stderr, "打開输出文件時發生錯誤。\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);       // 红色
    white = gdImageColorAllocate(img, 255, 255, 255); // 白色
    blue = gdImageColorAllocate(img, 0, 0, 153);      // 藍色

    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;

    // 繪製白色斜線
    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);


    // 繪製红色斜線
    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;

  // 繪製  斜線
  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);


  }

    // 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>

#define WIDTH 900
#define HEIGHT 600
#define FILENAME "south_korea_flag.png"

int main() {
    gdImagePtr im;
    FILE *pngout;
    int white, black, red, blue;

    im = gdImageCreate(WIDTH, HEIGHT);

    white = gdImageColorAllocate(im, 255, 255, 255);
    black = gdImageColorAllocate(im, 0, 0, 0);
    red = gdImageColorAllocate(im, 205, 0, 0);
    blue = gdImageColorAllocate(im, 0, 56, 168);

    // Background (white)
    gdImageFilledRectangle(im, 0, 0, WIDTH, HEIGHT , white);

    // Blue Circle (Yin-Yang Symbol)
    gdImageFilledArc(im, WIDTH / 2, HEIGHT / 2, WIDTH / 3, HEIGHT / 2, 210, 30, red, gdArc);

    // Red Circle (Yin-Yang Symbol)
    gdImageFilledArc(im, WIDTH / 2, HEIGHT / 2, WIDTH / 3, HEIGHT / 2, 30, 210, blue, gdArc);

  int circleX = 385;    // 圓心的 X 座標
  int circleY = 262.5;   // 圓心的 Y 座標
  int circleRadius = 75;     

  // 繪製圓形
  gdImageFilledEllipse(im, circleX, circleY, circleRadius * 2, circleRadius * 2, red);

  int circleX2 = 515;    // 圓心的 X 座標

 int circleY2 = 337.5;

  // 繪製圓形
  gdImageFilledEllipse(im, circleX2, circleY2, circleRadius * 2, circleRadius * 2, blue);

  {


  // 起點和終點位置
  int startX = 340;    
  // 線的起點 X 座標
  int startY = 90;   
  // 線的起點 Y 座標
  int endX = 200;     
  // 線的終點 X 座標
  int endY = 260;     
  // 線的終點 Y 座標
  int lineWidth = 23;  // 線的寬度

  // 繪製線段
  gdImageSetThickness(im, lineWidth);
  gdImageLine(im, startX, startY, endX, endY, black);
  // 繪製線段
  gdImageSetThickness(im, lineWidth);
  gdImageLine(im, startX -35, startY -10, endX -35, endY -10, black);

  // 繪製線段
  gdImageSetThickness(im, lineWidth);
  gdImageLine(im, startX -70, startY -20, endX -70, endY -20, black);

  int startX2 = 213;    
  // 線的起點 X 座標
  int startY2 = 270;   
  // 線的起點 Y 座標
  int endX2 = 133;     
  // 線的終點 X 座標
  int endY2 = 210;     
  // 線的終點 Y 座標
  int lineWidth2 = 25;  // 線的寬度

  // 繪製線段
  gdImageSetThickness(im, lineWidth);
  gdImageLine(im, startX2 +3, startY2, endX2 +3, endY2, white);

  gdImageSetThickness(im, lineWidth +10);
gdImageLine(im, startX2 -17, startY2 +9 , endX2 -17, endY2 +9 , white);

  gdImageSetThickness(im, lineWidth );
gdImageLine(im, startX2 +115, startY2 -145, endX2 +115, endY2 -145, white);

  gdImageSetThickness(im, lineWidth);
gdImageLine(im, startX2 +120, startY2 -155, endX2 +120, endY2 -155, white);

  gdImageSetThickness(im, lineWidth +12);
gdImageLine(im, startX2 +145, startY2 -155, endX2 +145, endY2 -155, white);
}
  {
    // 起點和終點位置
  int startX = 330;    
  // 線的起點 X 座標
  int startY = 520;   
  // 線的起點 Y 座標
  int endX = 190;     
  // 線的終點 X 座標
  int endY = 350;     
  // 線的終點 Y 座標
  int lineWidth = 23;  // 線的寬度

  // 繪製線段
  gdImageSetThickness(im, lineWidth);
  gdImageLine(im, startX, startY, endX, endY, black);
  // 繪製線段
  gdImageSetThickness(im, lineWidth);
  gdImageLine(im, startX -35, startY +10, endX -35, endY +10, black);

  // 繪製線段
  gdImageSetThickness(im, lineWidth);
  gdImageLine(im, startX -70, startY +20, endX -70, endY +20, black);
  int startX2 = 213;    
  // 線的起點 X 座標
  int startY2 = 330;   
  // 線的起點 Y 座標
  int endX2 = 133;     
  // 線的終點 X 座標
  int endY2 = 390;     
  // 線的終點 Y 座標
  int lineWidth2 = 25;  // 線的寬度

  // 繪製線段
  gdImageSetThickness(im, lineWidth +8);
  gdImageLine(im, startX2 -11, startY2, endX2 -11, endY2, white);

  gdImageSetThickness(im, lineWidth +10);
gdImageLine(im, startX2 -30, startY2 -9 , endX2 -30, endY2 -9 , white);

  gdImageSetThickness(im, lineWidth );
gdImageLine(im, startX2 +100, startY2 +150, endX2 +100, endY2 +150, white);

  gdImageSetThickness(im, lineWidth);
gdImageLine(im, startX2 +120, startY2 +155, endX2 +120, endY2 +155, white);

  gdImageSetThickness(im, lineWidth +14);
gdImageLine(im, startX2 +145, startY2 +157, endX2 +145, endY2 +157, white);

    gdImageSetThickness(im, lineWidth -10);
gdImageLine(im, 232, 426, 206, 448, white);

  }

  {
    // 起點和終點位置
  int startX = 564;    
  // 線的起點 X 座標
  int startY = 520;   
  // 線的起點 Y 座標
  int endX = 704;     
  // 線的終點 X 座標
  int endY = 350;     
  // 線的終點 Y 座標
  int lineWidth = 23;  // 線的寬度

  // 繪製線段
  gdImageSetThickness(im, lineWidth);
  gdImageLine(im, startX +70, startY +20, endX +70, endY +20, black);

    // 繪製線段
  gdImageSetThickness(im, lineWidth);
  gdImageLine(im, startX, startY, endX, endY, black);

    // 繪製線段
  gdImageSetThickness(im, lineWidth);
  gdImageLine(im, startX +35, startY +10, endX +35, endY +10, black);

gdImageSetThickness(im, lineWidth -10);
gdImageLine(im, 624, 400, 734, 490, white);
  int startX2 = 553;    
  // 線的起點 X 座標
  int startY2 = 330;   
  // 線的起點 Y 座標
  int endX2 = 633;     
  // 線的終點 X 座標
  int endY2 = 390;     
  // 線的終點 Y 座標
  int lineWidth2 = 25;  // 線的寬度

  // 繪製線段
  gdImageSetThickness(im, lineWidth +8);
  gdImageLine(im, startX2 +139, startY2, endX2 +139, endY2, white);

  gdImageSetThickness(im, lineWidth +10);
gdImageLine(im, startX2 +157, startY2 -9 , endX2 +157, endY2 -9 , white);

  gdImageSetThickness(im, lineWidth);
gdImageLine(im, startX2 +25, startY2 +155, endX2 +25, endY2 +155, white);

  gdImageSetThickness(im, lineWidth +30);
gdImageLine(im, startX2 -3, startY2 +170, endX2 , endY2 +170, white);
  }
  {
    // 起點和終點位置
  int startX = 330;    
  // 線的起點 X 座標
  int startY = 520;   
  // 線的起點 Y 座標
  int endX = 190;     
  // 線的終點 X 座標
  int endY = 350;     
  // 線的終點 Y 座標
  int lineWidth = 23;  // 線的寬度

  // 繪製線段
  gdImageSetThickness(im, lineWidth);
  gdImageLine(im, startX, startY, endX, endY, black);
  // 繪製線段
  gdImageSetThickness(im, lineWidth);
  gdImageLine(im, startX -35, startY +10, endX -35, endY +10, black);

  // 繪製線段
  gdImageSetThickness(im, lineWidth);
  gdImageLine(im, startX -70, startY +20, endX -70, endY +20, black);

  int startX2 = 213;    
  // 線的起點 X 座標
  int startY2 = 330;   
  // 線的起點 Y 座標
  int endX2 = 133;     
  // 線的終點 X 座標
  int endY2 = 390;     
  // 線的終點 Y 座標
  int lineWidth2 = 25;  // 線的寬度

  // 繪製線段
  gdImageSetThickness(im, lineWidth +8);
  gdImageLine(im, startX2 -11, startY2, endX2 -11, endY2, white);

  gdImageSetThickness(im, lineWidth +10);
gdImageLine(im, startX2 -30, startY2 -9 , endX2 -30, endY2 -9 , white);

  gdImageSetThickness(im, lineWidth );
gdImageLine(im, startX2 +100, startY2 +150, endX2 +100, endY2 +150, white);

  gdImageSetThickness(im, lineWidth);
gdImageLine(im, startX2 +120, startY2 +155, endX2 +120, endY2 +155, white);

  gdImageSetThickness(im, lineWidth +14);
gdImageLine(im, startX2 +145, startY2 +157, endX2 +145, endY2 +157, white);

    gdImageSetThickness(im, lineWidth -10);
gdImageLine(im, 232, 426, 206, 448, white);

  }
  {
    // 起點和終點位置
  int startX = 564;    
  // 線的起點 X 座標
  int startY = 97;   
  // 線的起點 Y 座標
  int endX = 704;     
  // 線的終點 X 座標
  int endY = 267;     
  // 線的終點 Y 座標
  int lineWidth = 23;  // 線的寬度

  // 繪製線段
  gdImageSetThickness(im, lineWidth);
  gdImageLine(im, startX +70, startY -20, endX +70, endY -20, black);

    // 繪製線段
  gdImageSetThickness(im, lineWidth);
  gdImageLine(im, startX, startY, endX, endY, black);

    gdImageSetThickness(im, lineWidth -10);
gdImageLine(im, 624, 212, 734, 118, white);

    // 繪製線段
  gdImageSetThickness(im, lineWidth);
  gdImageLine(im, startX +35, startY -10, endX +35, endY -10, black);
  int startX2 = 553;    
  // 線的起點 X 座標
  int startY2 = 277;   
  // 線的起點 Y 座標
  int endX2 = 633;     
  // 線的終點 X 座標
  int endY2 = 217;     
  // 線的終點 Y 座標
  int lineWidth2 = 25;  // 線的寬度

  // 繪製線段
  gdImageSetThickness(im, lineWidth +8);
  gdImageLine(im, startX2 +134, startY2, endX2 +134, endY2, white);

  gdImageSetThickness(im, lineWidth +10);
gdImageLine(im, startX2 +157, startY2 +9 , endX2 +157, endY2 +9 , white);

  gdImageSetThickness(im, lineWidth);
gdImageLine(im, startX2 +25, startY2 -155, endX2 +25, endY2 -155, white);

    gdImageSetThickness(im, lineWidth +30);
gdImageLine(im, startX2 -5, startY2 -155, endX2 -5, endY2 -155, white);

  }

    // Save image
FILE *outputFile = fopen("./../images/korea_flag.png", "wb");
if (outputFile == NULL) {
    fprintf(stderr, "Error opening the output file.\n");
    return 1;
}
  gdImagePngEx(im, outputFile, 9);
      fclose(outputFile);
      gdImageDestroy(im);
      return 0;
  }


說明基本 gd 繪圖 << Previous Next >> China flag Program Usage

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