在我的作业中,有一个术语是2个节点之间,前一次单击的节点应保留在屏幕上,并且应该有将每个节点与下一个节点相连的行(最后一个节点与第一个节点相连)。除了这些行(当然还有网格线)之外,应该没有其他行。我尝试通过使用数组内部的循环来做到这一点。但这不是我正在寻找的答案。...
int [] a;
int [] b;
ArrayList<Point> points = new ArrayList<Point>();
class Point {
int x, y, r;
Point(int x, int y, int r) {
this.x = x;
this.y = y;
this.r = r;
}
void Draw() {
circle(this.x, this.y, this.r*2);
}
}
int n_part=10;
void setup(){
size(600,360);
a = new int [100];
b = new int [100];
}
void draw () {
background (255);
int gridW = width/n_part;
int gridH = height/n_part;
stroke(210);
noFill();
for (int row = 0; row < n_part; row++){
int gridY = 0 + row*gridH;
for (int col = 0; col < n_part; col++) {
int gridX = 0+ col* gridW;
rect (gridX, gridY, gridW, gridH);
}
}
stroke(0, 0, 0);
fill(0);
for (int i = 0; i < points.size(); ++ i) {
Point p = points.get(i);
p.Draw();
}
}
void mousePressed() {
int gridW = width/n_part;
int gridH = height/n_part;
int x = round(mouseX / (float)gridW) * gridW;
int y = round(mouseY / (float)gridH) * gridH;
points.add(new Point(x, y, 5));
{
for (int j=0; j < a.length; j++)
a [j] = (mouseX / (int)gridW) * gridW;
for (int k=0; k < b.length; k++)
b [k] = height;
}
}
void mouseReleased(){
for (int k=0; k < a.length; k++)
line (0, 0, a [k], b [k]);
}
答案 0 :(得分:0)
您要做的就是在连续点之间画线。
点i
的下一个索引是i+1
。最后一点是0。这可以通过模(%
)运算符(h (i+1) % points.size()
)来实现。
获取一个循环中的两个连续点,并在它们之间画一条线:
for (int i = 0; i < points.size(); ++ i) {
Point p1 = points.get(i);
Point p2 = points.get((i+1) % points.size());
line(p1.x, p1.y, p2.x, p2.y);
}
请参见示例:
void draw () {
background (255);
int gridW = width/n_part;
int gridH = height/n_part;
strokeWeight(1);
stroke(210);
noFill();
for (int row = 0; row < n_part; row++){
int gridY = 0 + row*gridH;
for (int col = 0; col < n_part; col++) {
int gridX = 0+ col* gridW;
rect (gridX, gridY, gridW, gridH);
}
}
stroke(0, 0, 0);
fill(0);
for (int i = 0; i < points.size(); ++ i) {
Point p = points.get(i);
p.Draw();
}
strokeWeight(3);
stroke(255, 0, 0);
for (int i = 0; i < points.size(); ++ i) {
Point p1 = points.get(i);
Point p2 = points.get((i+1) % points.size());
line(p1.x, p1.y, p2.x, p2.y);
}
}