Question

这是为了完成家庭作业而我很困惑该做什么。它要求我创建一个项目作为用户定义的函数，然后使其绘制，以便绘图根据我的鼠标的X和Y坐标移动。它还要求我在接近画布的顶部和底部时改变它的大小。目前，我已经完成了我的绘图并尝试使用另一个用户定义的函数来移动它，但我没有多少运气。

 int xCtr = width/2, yCtr = height/2;  //Center
 final int SAUCEHEIGHT = 150, SAUCEWIDTH = 200;
 int foodSize;
 int positionX = mouseX, positionY = mouseY;  
void setup(){
 //Parameters and variables
 size(500,500);  //Canvas size
 background(0,0,225); //blue background  
}
void drawFood(){
 //Plate
 /*
 *This function is used to sketch a beige ellipse.
 *The inputs for this function come from the filling and the ellipse which uses the int xCtr and yCtr.
 *The output of the function creates a beige plate.
 *For fill, data stored as int are used in its parameters, where as for ellipse, the data is stored as floats.
 */
 fill(245,245,220);  //beige
 ellipse(xCtr,yCtr,width,height); //plate

 //Rice
 /*
 *This function is used to sketch a white ellipse.
 *The inputs for the function come from fill and ellipse, with the ellipse using int xCtr and yCtr.
 *The output of the function is white rice.
 *Fill stores the data in int, and ellipse stores its data in float.
 */
 fill(255,255,255); //white
 ellipse(xCtr,yCtr,width*2/3,height*2/3); //White Rice 

 //Sauce
 /*
 *This function is used to sketch a brown ellipse
 *The inputs are fill and ellipse.  Ellipse uses the int xCtr and yCtr.
 *The output of the function is a brown sauce.
 *Fill stores the data in int, and ellipse stores its data in float.
 */
 strokeWeight(2);  //Better defined border
 fill(134,100,79);  //Gravy Brown
 ellipse(xCtr-50,yCtr-100,SAUCEWIDTH,SAUCEHEIGHT);  //Sauce

 //Steak
 /*
 *This function is used to sketch a thick brown line.
 *The inputs for the function come from strokeWeight, stroke, and line.  
 *The output of the function is a steak with grill marks.
 *StrokeWeight uses float, stroke uses int, and line uses floats.
 */
 strokeWeight(150); //thickness
 stroke(125,64,7); // Gordon Ramsay Steak Brown
 line(xCtr+50,yCtr+50,xCtr+150,yCtr+50); //Steak

 //Grill Marks
 /*
 *This function is used to sketch a checkered pattern.
 *The inputs for the function come from strokeWeight, stroke, and line.  
 *The output of the function are grill marks.
 *StrokeWeight uses float, stroke uses int, and line uses floats.
 */
 strokeWeight(2);
 stroke(0,0,0); //black
 //Vertical Grill Lines
 line(xCtr+50,yCtr-20,xCtr+50,yCtr+120); //1st Vertical
 line(xCtr+100,yCtr-20,xCtr+100,yCtr+120); //2nd Vertical
 line(xCtr+150,yCtr-20,xCtr+150,yCtr+120); //3rd Vertical
 //Horizontal Grill Lines
 line(xCtr-20,yCtr+25,xCtr+220,yCtr+25);
 line(xCtr-20,yCtr+75,xCtr+220,yCtr+75);
}
void moveFood(){
 foodSize = mouseY/height;
}

我可以做些什么来改变它，还是有任何可能有用的参考？

感谢您抽出宝贵时间回答。

Answer 1

Stack Overflow实际上并不是针对一般的“我该怎么做”这类问题而设计的。这是针对具体的“我试过X，期待Y，但得到Z而不是”类型的问题。但我会尝试在一般意义上提供帮助：

现在，您的drawFood()函数使用xCtr和yCtr变量来了解绘制所有内容的位置。你的作业要求你将参数传递给drawFood()函数并改用它们。

您需要break your problem down into smaller steps并一次一个地执行这些步骤。你能创建一个只绘制简单形状的小例子程序，如圆圈吗？将它放在一个函数中，该函数使用草图级变量来决定绘制圆的位置。然后修改该函数，使其使用参数。在尝试让它完成整个家庭作业之前，先在您的小型示例程序中使用它。然后，如果您遇到问题，可以发布MCVE以及特定的技术问题。祝你好运。

无耻的自我推销：我写了一篇关于创建带有参数here的函数的教程。

在Processing中，如何生成随鼠标移动的图形并更改尺寸？

1 个答案: