使用processing 绘制一个 地球仪
时间: 2024-05-13 20:16:29 浏览: 8
以下是使用 Processing 绘制地球仪的示例代码:
```java
float r = 200; // 地球仪半径
float angleX = 0;
float angleY = 0;
float speedX = 0.01;
float speedY = 0.01;
float[] x = new float[360];
float[] y = new float[360];
float[] z = new float[360];
void setup() {
size(600, 600, P3D);
smooth();
for (int i = 0; i < 360; i++) {
x[i] = r * cos(radians(i));
y[i] = r * sin(radians(i));
z[i] = r * sin(radians(i));
}
}
void draw() {
background(0);
noStroke();
lights();
translate(width/2, height/2, 0);
rotateX(angleX);
rotateY(angleY);
fill(0, 0, 255); // 绘制地球仪表面
for (int i = 0; i < 180; i+=10) {
beginShape(TRIANGLE_STRIP);
for (int j = 0; j < 360; j+=10) {
vertex(x[j] * cos(radians(i)), y[j] * cos(radians(i)), z[j]);
vertex(x[j] * cos(radians(i+10)), y[j] * cos(radians(i+10)), z[j]);
}
endShape();
}
fill(255, 0, 0); // 绘制地球仪上的标记点
for (int i = 0; i < 360; i += 30) {
for (int j = -60; j <= 60; j += 30) {
float lat = radians(j);
float lon = radians(i);
float x = r * cos(lat) * cos(lon);
float y = r * cos(lat) * sin(lon);
float z = r * sin(lat);
pushMatrix();
translate(x, y, z);
sphere(5);
popMatrix();
}
}
angleX += speedX;
angleY += speedY;
}
```
这段代码会绘制一个具有红色标记点的蓝色地球仪。可以使用鼠标左键拖动地球仪。