Install easyx graphics library for c language

Follow the steps in the figure to install the easyx graphics library.

Next look at the code:

#include<easyx.h>
#include<stdio.h>
#define width 800
#define height 600

int main()
{
	initgraph(width, height);       // 初始化窗口（宽度， 高度） （单位像素）
	setorigin(width/2, height/2);   // 设置逻辑原点为窗口中心
	setaspectratio(1, -1);          //  设置xy坐标轴（x：1，y：-1）代表y翻转， x不动
	circle(0, 100, 100);            // 画一个圆（x：0,y：100的位置，半径为100）
	getchar();                      //阻断一下程序，防止窗口一闪而过。
	closegraph();                   // 关闭窗口
	return 0;
}

The physical coordinates are at 0,0 in the upper left corner of the window, but we use logical coordinates, so we need to set the origin of the logical coordinates: setorigin(width/2, height/2); // Set the logical origin to the center of the window

The subsequent x direction is from left to right, and the y direction is from top to bottom, which does not conform to our school-viewing strategy. The y direction should be from top to bottom, so set the y-axis direction: setaspectratio(1, -1); // Set the xy coordinate axis (x: 1, y: -1) to represent y flipping and x not moving.

The next step is to draw a circle: circle(0, 0, 100); // Draw a circle (position x: 0, y: 0, radius 100) as shown in the figure below:

The following is to draw 4 points:

#include<easyx.h>
#include<stdio.h>
#define width 800
#define height 600

int main()
{
	initgraph(width, height);            // 初始化窗口（宽度， 高度） （单位像素）
	setorigin(width / 2, height / 2);    // 设置逻辑原点为窗口中心
	setaspectratio(1, -1);               //  设置xy坐标轴（x：1，y：-1）代表y翻转， x不动
	putpixel(100,100, RED);              //画一个点（x:100， y:100， 红色）
	putpixel(100, -100, YELLOW);         //画一个点（x:100， y:-100， 黄色）
	putpixel(-100, -100, GREEN);         //画一个点（x:-100， y:-100， 绿色）
	putpixel(-100, 100, BLUE);           //画一个点（x:-100， y:100， 蓝色）
	getchar();
	closegraph();
	return 0;
}

According to the above learning, next draw 1000 random points:

#include<easyx.h>
#include<stdio.h>
#define width 1200      // 窗口宽度
#define height 960      // 窗口高度
#include<time.h>

int main()
{
	srand((unsigned int)time(NULL));
	initgraph(width, height);            // 初始化窗口（宽度， 高度） （单位像素）
	setorigin(width / 2, height / 2);    // 设置逻辑原点为窗口中心
	setaspectratio(1, -1);               //  设置xy坐标轴（x：1，y：-1）代表y翻转， x不动
	int i = 0;
	for (i = 0; i < 1000; i++)      // 绘制1000个点，位置随机
	{
		int x = rand() % (width + 1) - width / 2;
		int y = rand() % (height + 1) - height / 2;
		putpixel(x, y, GREEN);              //画一个点（x:100， y:100， 红色）
	}
		
	putpixel(100, -100, YELLOW);         //画一个点（x:100， y:-100， 黄色）
	putpixel(-100, -100, GREEN);         //画一个点（x:-100， y:-100， 绿色）
	putpixel(-100, 100, BLUE);           //画一个点（x:-100， y:100， 蓝色）
	getchar();
	closegraph();
	return 0;
}

line (starting point x, starting point y, end point x, end point y):

draw line:

#include<easyx.h>
#include<stdio.h>
#define W 900    //  窗口宽度
#define H 600    //  窗口高度

int main()
{
	initgraph(W, H);
	setaspectratio(1,-1);
	setorigin(W / 2, H / 2);
	line(-200, 200, 200, -200);   // 从坐标-200, 200  到坐标200, -200画一条线
	getchar();
	closegraph();
	return 0;
}

Next, use the circle function to draw a bullseye:

#include<easyx.h>
#include<stdio.h>
#define W 900
#define H 700

int main()
{
	initgraph(W, H);
	setorigin(W/2,H/2);
	setaspectratio(1, -1);
	int i = 0;
	for (i = 10; i <= 300; i += 10)
	{
		circle(0, 0, i);
	}
	getchar();
	closegraph();
	return 0;
}

Next, learn to draw a rectangle function:

rectangle (x coordinate of upper left corner, y coordinate of upper left corner, x coordinate of lower right corner, y coordinate of lower right corner)

#include<easyx.h>
#include<stdio.h>
#define W 800
#define H 600

int main()
{
	initgraph(W, H);
	setorigin(W / 2, H / 2);
	setaspectratio(1, -1);

	rectangle(-200, 200, 200, -200);

	getchar();
	closegraph();
	return 0;
}

Let's learn to draw elliptic functions:

ellipse (x coordinate of the upper left corner, y coordinate of the upper left corner, x coordinate of the lower right corner, y coordinate of the lower right corner)

#include<easyx.h>
#include<stdio.h>
#define W 800
#define H 600

int main()
{
	initgraph(W, H);
	setorigin(W / 2, H / 2);
	setaspectratio(1, -1);
	
	ellipse(-200, 100, 200, -100);

	getchar();
	closegraph();
	return 0;
}

Let's learn to draw a rounded rectangle:

The four rounded corners of a rounded rectangle are actually composed of four ellipses:

#include<easyx.h>
#include<stdio.h>
#define W 800
#define H 600

int main()
{
	initgraph(W, H);
	setorigin(W / 2, H / 2);
	setaspectratio(1, -1);

	roundrect(-200, 100, 200, -100, 200, 100);

	getchar();
	closegraph();
	return 0;
}

Plot the sector function:

#include<easyx.h>
#include<stdio.h>
#define W 800
#define H 600
#define PI 3.14

int main()
{
	initgraph(W, H);
	setorigin(W / 2, H / 2);
	setaspectratio(1, -1);

	pie(-200, 100, 200, -100, 0, PI/4);

	getchar();
	closegraph();
	return 0;
}

Draw the arc function:

#include<easyx.h>
#include<stdio.h>
#define W 800
#define H 600
#define PI 3.14

int main()
{
	initgraph(W, H);
	setorigin(W / 2, H / 2);
	setaspectratio(1, -1);

	arc(-200, 100, 200, -100, 0, PI / 4);

	getchar();
	closegraph();

	return 0;
}

Install easyx graphics library for c language

Guess you like