[TOC]

1.绘制扇形

函数solidpie(left,top,right,bottom,stangle,endangle)可以绘制无边框的填充扇形。

其中，stangle是扇形的起初角，endangle是终止角，角度单位为弧度。

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#include<graphics.h>
#include<conio.h>
#include<stdio.h>
int main() {
	float PI = 3.14159;//圆周率
	initgraph(600, 600);//打开一个窗口
	int centerX = 300;//圆心坐标
	int centerY = 300;
	int radius = 200;//圆半径
	circle(centerX, centerY, radius);//画出圆边框
	int left = centerX - radius;
	int top = centerY - radius;
	int right = centerX + radius;
	int bottom = centerY + radius;
	solidpie(left, top, right, bottom, PI / 6, PI / 3);//画填充扇形，角度为PI/6到PI/3
	_getch();
	closegraph();
	return 0;
}

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2.RGB颜色模型

EasyX可以设置绘图颜色（要先设置颜色，再绘图）

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setbkcolor(WHITE);//设置背景颜色为白色
setlinecolor(RED);//设置线条为红色
setfillcolor(GREEN);//设置填充颜色为绿色
cleardevice();//以背景颜色清空画布

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3.绘制一个扇形单元

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#include<graphics.h>
#include<conio.h>
#include<stdio.h>
int main() {
	float PI = 3.14159;//圆周率

	initgraph(600, 600);//打开一个窗口
	setbkcolor(RGB(128, 128, 128));//设置背景颜色为灰色
	cleardevice();//以背景颜色清空画布
	
	int centerX = 300;//圆心坐标
	int centerY = 300;
	int radius = 200;//圆半径
	circle(centerX, centerY, radius);//画出圆边框
	int left = centerX - radius;
	int top = centerY - radius;
	int right = centerX + radius;
	int bottom = centerY + radius;
	
	int i;
	float offset;
	for (i = 0; i < 20; i++) {
		offset = i * PI / 10;//各组扇形之间的偏移的角度
		setfillcolor(GREEN);
		solidpie(left, top, right, bottom,offset, 2 * PI / 60 + offset);//画填充扇形
		setfillcolor(WHITE);
		solidpie(left, top, right, bottom, 2 * PI / 60 + offset, 3 * PI / 60 + offset);//画填充扇形
		setfillcolor(RED);
		solidpie(left, top, right, bottom, 3 * PI / 60 + offset, 5 * PI / 60 + offset);//画填充扇形
		setfillcolor(BLUE);
		solidpie(left, top, right, bottom, 5 * PI / 60 + offset, 6 * PI / 60 + offset);//画填充扇形
	}
	
	_getch();
	closegraph();
	return 0;

}

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4.循环嵌套

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#include<graphics.h>
#include<conio.h>
#include<stdio.h>
int main() {
	float PI = 3.14159;//圆周率

	initgraph(600, 600);//打开一个窗口
	setbkcolor(RGB(128, 128, 128));//设置背景颜色为灰色
	cleardevice();//以背景颜色清空画布
	
	int centerX = 300;//圆心坐标
	int centerY = 300;
	int radius = 200;//圆半径
	circle(centerX, centerY, radius);//画出圆边框
	
	int i;
	float offset;//同一半径各组扇形之间的偏移的角度
	float totaloffset = 0;//不同半径之间的角度偏移量
	for (radius = 200; radius > 0; radius = radius - 50) {//半径从小到大绘制
		int left = centerX - radius;
		int top = centerY - radius;
		int right = centerX + radius;
		int bottom = centerY + radius;
		for (i = 0; i < 20; i++) {//旋转一周，绘制扇形区域
			offset = i * PI / 10 + totaloffset;
			setfillcolor(GREEN);
			solidpie(left, top, right, bottom, offset, 2 * PI / 60 + offset);//画填充扇形
			setfillcolor(WHITE);
			solidpie(left, top, right, bottom, 2 * PI / 60 + offset, 3 * PI / 60 + offset);//画填充扇形
			setfillcolor(RED);
			solidpie(left, top, right, bottom, 3 * PI / 60 + offset, 5 * PI / 60 + offset);//画填充扇形
			setfillcolor(BLUE);
			solidpie(left, top, right, bottom, 5 * PI / 60 + offset, 6 * PI / 60 + offset);//画填充扇形
		}
		totaloffset = totaloffset + PI / 20;
	}
	
	_getch();
	closegraph();
	return 0;

}

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5.多个圆盘

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for (centerX - 200; centerX < 1200; centerX = centerX + 400) {
		for (centerY = 200; centerY < 800; centerY = centerY + 400) {
			for (radius = 200; radius > 0; radius = radius - 50) {//半径从小到大绘制
				int left = centerX - radius;
				int top = centerY - radius;
				int right = centerX + radius;
				int bottom = centerY + radius;
				for (i = 0; i < 20; i++) {//旋转一周，绘制扇形区域
					offset = i * PI / 10 + totaloffset;
					setfillcolor(GREEN);
					solidpie(left, top, right, bottom, offset, 2 * PI / 60 + offset);//画填充扇形
					setfillcolor(WHITE);
					solidpie(left, top, right, bottom, 2 * PI / 60 + offset, 3 * PI / 60 + offset);//画填充扇形
					setfillcolor(RED);
					solidpie(left, top, right, bottom, 3 * PI / 60 + offset, 5 * PI / 60 + offset);//画填充扇形
					setfillcolor(BLUE);
					solidpie(left, top, right, bottom, 5 * PI / 60 + offset, 6 * PI / 60 + offset);//画填充扇形
				}
				totaloffset = totaloffset + PI / 20;
			}
		}
	}

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6.HSV颜色模型

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在HSV模型中，颜色是由色度（Hue），饱和度（Saturation），明度（Value）共同组成

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COLORREFN color;//定义颜色变量

color = HSVtoRGB(1,1,1);//HSV设置的颜色

setfillcolor(color);//设置填充颜色为color

7.全部代码

使用srand(time(0))表示用当前时间对随机函数初始化，必须添加头文件#include<time.h>

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#include<graphics.h>
#include<conio.h>
#include<stdio.h>
#include<time.h>
int main() {
	float PI = 3.14159;//圆周率

	initgraph(1600, 800);//打开一个窗口
	setbkcolor(RGB(128, 128, 128));//设置背景颜色为灰色
	cleardevice();//以背景颜色清空画布
	srand(time(0));//随机种子函数
	
	int centerX = 300;//圆心坐标
	int centerY = 300;
	int radius = 200;//圆半径
	
	int i;
	float offset;//同一半径各组扇形之间的偏移的角度
	float totaloffset = 0;//不同半径之间的角度偏移量
	for (centerX - 200; centerX < 1200; centerX = centerX + 400) {
		for (centerY = 200; centerY < 800; centerY = centerY + 400) {
			float h = rand() % 180;//随机色调
			COLORREF color1 = HSVtoRGB(h, 0.9, 0.8);//色调1生成的颜色1
			COLORREF color2 = HSVtoRGB(h + 180, 0.9, 0.8);//色调2生成的颜色2
			for (radius = 200; radius > 0; radius = radius - 50) {//半径从小到大绘制
				int left = centerX - radius;
				int top = centerY - radius;
				int right = centerX + radius;
				int bottom = centerY + radius;
				for (i = 0; i < 20; i++) {//旋转一周，绘制扇形区域
					offset = i * PI / 10 + totaloffset;
					setfillcolor(color1);
					solidpie(left, top, right, bottom, offset, 2 * PI / 60 + offset);//画填充扇形
					setfillcolor(WHITE);
					solidpie(left, top, right, bottom, 2 * PI / 60 + offset, 3 * PI / 60 + offset);//画填充扇形
					setfillcolor(color2);
					solidpie(left, top, right, bottom, 3 * PI / 60 + offset, 5 * PI / 60 + offset);//画填充扇形
					setfillcolor(BLUE);
					solidpie(left, top, right, bottom, 5 * PI / 60 + offset, 6 * PI / 60 + offset);//画填充扇形
				}
				totaloffset = totaloffset + PI / 20;
			}
		}
	}
	
	_getch();
	closegraph();
	return 0;

}

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