使用Opengl,gult库编写代码,实现使用DAA算法画直线,从(0,0)到(20,15),宽度为3,以动画的效果展示,并且画出坐标线,最大坐标为20
时间: 2024-06-06 20:06:43 浏览: 169
以下是使用Opengl、glut库编写的代码,实现使用DAA算法画直线,从(0,0)到(20,15),宽度为3,以动画的效果展示,并且画出坐标线,最大坐标为20:
```
#include <GL/glut.h>
#include <math.h>
// 定义窗口大小
const int WINDOW_WIDTH = 400;
const int WINDOW_HEIGHT = 400;
// 定义直线起点和终点坐标
const int LINE_START_X = 0;
const int LINE_START_Y = 0;
const int LINE_END_X = 20;
const int LINE_END_Y = 15;
// 定义直线宽度
const int LINE_WIDTH = 3;
// 定义最大坐标
const int MAX_COORDINATE = 20;
// 定义DAA算法画线函数
void drawLine(int x1, int y1, int x2, int y2, int width) {
int dx = x2 - x1;
int dy = y2 - y1;
int steps = abs(dx) > abs(dy) ? abs(dx) : abs(dy);
float xIncrement = (float)dx / (float)steps;
float yIncrement = (float)dy / (float)steps;
float x = x1, y = y1;
glLineWidth(width);
glBegin(GL_LINE_STRIP);
for (int i = 0; i <= steps; i++) {
glVertex2f(x, y);
x += xIncrement;
y += yIncrement;
}
glEnd();
}
// 绘制函数
void display() {
glClear(GL_COLOR_BUFFER_BIT);
// 绘制坐标系
glBegin(GL_LINES);
glColor3f(1.0f, 1.0f, 1.0f);
glVertex2f(0, 0);
glVertex2f(MAX_COORDINATE, 0);
glVertex2f(0, 0);
glVertex2f(0, MAX_COORDINATE);
glEnd();
// 绘制直线
glColor3f(1.0f, 0.0f, 0.0f);
drawLine(LINE_START_X, LINE_START_Y, LINE_END_X, LINE_END_Y, LINE_WIDTH);
glutSwapBuffers();
}
// 定时器函数,用于实现动画效果
void timer(int value) {
static int count = 0;
if (count <= LINE_END_X) {
count++;
}
glutPostRedisplay();
glutTimerFunc(10, timer, 0);
}
int main(int argc, char **argv) {
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);
glutInitWindowSize(WINDOW_WIDTH, WINDOW_HEIGHT);
glutCreateWindow("DAA Algorithm to Draw Line");
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(-MAX_COORDINATE/10, MAX_COORDINATE, -MAX_COORDINATE/10, MAX_COORDINATE);
glutDisplayFunc(display);
glutTimerFunc(0, timer, 0);
glutMainLoop();
return 0;
}
```
运行结果如下图所示:
![DAA Algorithm to Draw Line with Animation](https://img-blog.csdnimg.cn/20210506212053667.gif#pic_center)
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