使用 C 图形填充算法
概念
对于给定的矩形,我们的任务是应用填充算法来填充该矩形。
输入
rectangle(left = 50, top = 50, right= 100, bottom = 100) floodFill( a = 55, b = 55, NewColor = 12, OldColor = 0)
输出
方式
// 一个递归函数,在 (a, b) 处将之前的颜色“OldColor”替换为新颜色“NewColor”,并将 (a, b) 的所有相邻像素也用新颜色填充,即 floodFill(a, b, NewColor, OldColor)
如果 a 或 b 在屏幕外,则返回。
如果 getpixel(a, b) 的颜色与 OldColor 相同,则
递归遍历上方、下方、右侧和左侧。
floodFill(a+1, b, NewColor, OldColor);
floodFill(a-1, b, NewColor, OldColor);
floodFill(a, b+1, NewColor, OldColor);
floodFill(a, b-1, NewColor, OldColor);
示例
// Shows program to fill polygon using floodfill // algorithm #include <graphics.h> #include <stdio.h> // Describes flood fill algorithm void flood(int x1, int y1, int new_col, int old_col){ // Checking current pixel is old_color or not if (getpixel(x1, y1) == old_col) { // Putting new pixel with new color putpixel(x1, y1, new_col); // Shows recursive call for bottom pixel fill flood(x1 + 1, y1, new_col, old_col); //Shows recursive call for top pixel fill flood(x1 - 1, y1, new_col, old_col); // Shows recursive call for right pixel fill flood(x1, y1 + 1, new_col, old_col); // Shows recursive call for left pixel fill flood(x1, y1 - 1, new_col, old_col); } } int main(){ int gd1, gm1 = DETECT; // Initializing graph initgraph(&gd1, &gm1, ""); //Shows rectangle coordinate int top1, left1, bottom1, right1; top1 = left1 = 50; bottom1 = right1 = 300; // Shows rectangle for print rectangle rectangle(left1, top1, right1, bottom1); // Fills start cordinate int x1 = 51; int y1 = 51; // Shows new color to fill int newcolor = 12; // Shows old color which you want to replace int oldcolor = 0; // Calling for fill rectangle flood(x1, y1, newcolor, oldcolor); getch(); return 0; }
输出
广告