我是Java的新手，我和我的伙伴似乎都无法弄清楚如何为特定部分设置背景。我们需要将牙买加国旗的背景设定为（250,230,82），但仅限于该部分。目前，当我们在Processing 2.0上运行程序时，该行会混淆我们编写的整个流程。这是我们到目前为止所做的：
int x=0;
void setup() {
size(320, 270);
background(0);
noStroke();
frameRate(240);
}
void draw() {
//germany, flag 1
fill(0); //black first horizontal bar
rect(0+x, 0, width+x, width);
fill(255, 0, 0); //red middle horizontal bar
rect(0+x, 90, width+x, width);
fill(240, 240, 0); //gold last horizontal bar
rect(0+x, 180, width+x, width);
//japan, flag 2
fill(255); //white background
rect(0+x-width, 0, width, height);
fill(255, 0, 0); //red circle middle
ellipse(width/2+x-width, height/2, 150, 150);
//france, flag 3
fill(0, 0, 255); //left blue vertical bar
rect(0+x-2*width, 0, width/3, height);
fill(255); //middle white vertical bar
rect(width/3+x-2*width, 0, width/3, height);
fill(255, 0, 0); //right red vertical bar
rect(2.0/3.0*width+x-2*width, 0, width/3, height);
//brazil, flag 4
fill(0, 180, 0); //dark green background
rect(0+x-3*width, 0, width, height);
fill(230, 230, 0); //gold rhombus
triangle(width/10+x-3*width, height/2, width/2+x-3*width, 30, width/2+x-3*width, 240); //gold rhombus left side
triangle(9.0/10.0*width+x-3*width, height/2, width/2+x-3*width, 30, width/2+x-3*width, 240); //gold rhombus right side
fill(0, 0, 150); //dark blue circle
ellipse(width/2+x-3*width, height/2, 120, 120);
fill(255); //stars
ellipse(170+x-3*width, 170, 3, 3); //stars 1
ellipse(177+x-3*width, 185, 3, 3); //stars 2
ellipse(151+x-3*width, 155, 3, 3); //stars 3
ellipse(112+x-3*width, 145, 3, 3); //stars 4
ellipse(132+x-3*width, 165, 3, 3); //stars 5
ellipse(147+x-3*width, 148, 3, 3); //stars 6
ellipse(157+x-3*width, 168, 3, 3); //stars 7
ellipse(180+x-3*width, 188, 3, 3); //stars 8
ellipse(190+x-3*width, 158, 3, 3); //stars 9
//sweden, flag 5
fill(0, 100, 190); //blueish teal background
rect(0+x-4*width, 0, width, height); //the "-4*width" needs to be added after every
fill(240, 210, 0); // gold nordic cross //^first x-place in order for the flags to follow one after
rect(width/4+x-4*width, 0, 30, height); //another like a big continuous flag, so the subsequent
rect(0+x-4*width, height/2-15, width, 30); //ones will be "-5*width", "-6*width", etc
//the "-15"^ is to center the horizontal line
//norsefire, flag 6
fill(0); //black background
rect(0+x-5*width, 0, width, height);
fill(255, 0, 0); //red double cross thing
rect(0+x-5*width, height/2-15, width, 30);//horizontal line
rect(width/8+x-5*width, 0, 30, height);//vertical line 1
rect(3.0/8.0*width+x-5*width, 0, 30, height);//vertical line 2
//chile, flag 7
fill(0, 0, 250); //blue left horizontal bar
rect(0+x-6*width, 0, 125, 145);
fill(250); //white right horizontal bar
rect(125+x-6*width, 0, 320, 145);
fill(250, 0, 0); //red last horizontal bar
rect(0+x-6*width, 145, 320, 270);
line(42+x-6*width, 53, 63, 30);
line(82+x-6*width, 53, 63, 30);
line(82+x-6*width, 53, 105, 58);
line(15+x-6*width, 58, 42, 53);
line(90+x-6*width, 75, 105, 58);
line(35+x-6*width, 75, 15, 58);
line(35+x-6*width, 75, 25, 95);
line(25+x-6*width, 95, 53, 88);
line(53+x-6*width, 88, 95, 95);
line(95+x-6*width, 95, 90, 75);
//jamaica, flag 8
// background(250, 230, 82); // This line is messing everything up
fill (0, 250, 0); //green triangle top
triangle (10+x-7*width, 0, 160+x-7*width, 120, 310+x-7*width, 0);
fill (0, 250, 0); //green triangle bot
triangle (10+x-7*width, 270, 160+x-7*width, 150, 310+x-7*width, 270);
fill (0); //black triangle left
triangle (0+x-7*width, 10, 145+x-7*width, 135, 0+x-7*width, 260);
fill (0); //black triangle right
triangle (320+x-7*width, 10, 175+x-7*width, 135, 320+x-7*width, 260);
//puerto rico, flag 9
fill(0, 0, 250); //blue triangle
triangle(0+x-8*width, 0, 0+x-8*width, 270, 166+x-8*width, 135);
fill(255, 0, 0); //red quad 1
quad(0+x-8*width, 0, 54+x-8*width, 54, 320+x-8*width, 54, 320+x-8*width, 0);
fill(250); //white quad 1
quad(54+x-8*width, 54, 108+x-8*width, 108, 320+x-8*width, 108, 320+x-8*width, 54);
fill(255, 0, 0); //red quad 2
quad(108+x-8*width, 108, 135+x-8*width, 135, 320+x-8*width, 135, 320+x-8*width, 108);
fill(255, 0, 0); //red quad 3
quad(135+x-8*width, 135, 108+x-8*width, 162, 320+x-8*width, 162, 320+x-8*width, 135);
fill(250); //white quad 2
quad(108+x-8*width, 162, 320+x-8*width, 162, 320+x-8*width, 216, 54+x-8*width, 216);
fill(250, 0, 0); //red quad 4
quad(54+x-8*width, 216, 0+x-8*width, 270, 320+x-8*width, 270, 320+x-8*width, 216);
//Kuwait flag, 10
fill(80, 168, 62); //green quad
quad(0+x-9*width, 0, 80+x-9*width, 90, 320+x-9*width, 90, 320+x-9*width, 0);
fill(250); //white quad
quad(80+x-9*width, 90, 80+x-9*width, 180, 320+x-9*width, 180, 320+x-9*width, 90);
fill(250, 0, 0); //red quad
quad(80+x-9*width, 180, 0+x-9*width, 270, 320+x-9*width, 270, 320+x-9*width, 180);
fill(0); //black quad
quad(0+x-9*width, 0, 0+x-9*width, 270, 80+x-9*width, 180, 80+x-9*width, 90);
x=x+1; //scrolls flags to right
if (x==9*width) { //resets flag scrolling, the number multiplied
x=0; //to the width is how many flag widths the first flag has moved
} // so the end result will be 9 widths bc we have 10 flags
}
答案 0 :(得分：0)
在Processing中，background()方法会覆盖已使用背景颜色绘制的所有内容。但是，在调用之前，您似乎已经绘制了一些东西。尝试使用fill()设置颜色，然后quad()仅绘制该标记的背景。
答案 1 :(得分：0)
您必须在绘制线条之前使用笔触（颜色）设置线条颜色，然后使用noStroke（）
设置线条关闭答案 2 :(得分：0)
因为你正在绘制一面大墙旗并在画布（相机）之前移动这个墙，你不能仅为这个小的移动部分改变背景它会影响整个墙壁的旗帜。那么为什么你不要一直使用你的重叠矩形程序，这样你的牙买加国旗就可以了。
//jamaica, flag 8
fill(250,230, 82); // yellow background
rect(0+x-7*width,0,width, width);
fill (0, 250, 0); //green triangle top
triangle (10+x-7*width, 0, 160+x-7*width, 120, 310+x-7*width, 0);
fill (0, 250, 0); //green triangle bot
triangle (10+x-7*width, 270, 160+x-7*width, 150, 310+x-7*width, 270);
fill (0); //black triangle left
triangle (0+x-7*width, 10, 145+x-7*width, 135, 0+x-7*width, 260);
fill (0); //black triangle right
triangle (320+x-7*width, 10, 175+x-7*width, 135, 320+x-7*width, 260);
btw for height参数最好始终使用height而不是width。
答案 3 :(得分：0)
它的旧帖子，但这可能会有所帮助
Image img = Toolkit.getDefaultToolkit().createImage("JamaicaFlag.jpeg");
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