android：随机选择属性的方式

发布于 2024-12-17 21:51:40 字数 704 浏览 0 评论 0原文

我有一个简单的程序可以通过画布绘制简单的形状。

private class MyViewCircle extends View {

    public MyViewCircle(Context context) {
        super(context);
        // TODO Auto-generated constructor stub
    }

    @Override
    protected void onDraw(Canvas canvas) {
        // TODO Auto-generated method stub
        super.onDraw(canvas);
        Paint paint = new Paint();
        paint.setAntiAlias(true);
        paint.setColor(Color.RED);
        canvas.drawCircle(89, 150, 30, paint);
    }

}

如您所见，圆的属性是

(Color.RED); 
(89, 150, 30, paint);

我想创建另一个包含许多其他功能（颜色和坐标）的类并随机选择它们。那么，数组、数组列表还是其他方式，哪种方式更好呢？有人可以给我一个例子如何做到这一点吗？那么如何随机选取它们并将它们放入绘制函数中呢？干杯!

原文

I have a simple program to draw simple shapes by canvas.

private class MyViewCircle extends View {

    public MyViewCircle(Context context) {
        super(context);
        // TODO Auto-generated constructor stub
    }

    @Override
    protected void onDraw(Canvas canvas) {
        // TODO Auto-generated method stub
        super.onDraw(canvas);
        Paint paint = new Paint();
        paint.setAntiAlias(true);
        paint.setColor(Color.RED);
        canvas.drawCircle(89, 150, 30, paint);
    }

}

As you see, the attributes of the circle is

(Color.RED); 
(89, 150, 30, paint);

I want to created another class includes a lot of other features(colors and coordinates) and select them randomly.
So, which way is better, array or arraylist or something else? Could someone gives me an example how to do that? Then how to randomly pick them and put them into the draw function? Cheers!

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吃兔兔 2024-12-24 21:51:40

尝试创建一个简单的 Java 对象来包含所有属性，然后将它们添加到单个列表中并随机选择一个项目：

class MyAttributes {
    int color;
    int x, y;
    int radius;

    public MyAttributes(int color, int x, int y, int radius) {
        this.color = color;
        this.x = x;
        this.y = y;
        this.radius = radius;
    }
}

在您的 View 类中：

private List<MyAttributes> mAttributes;
private Random mRandom;

public MyViewCircle(Context context) {
    mRandom = new Random();
    mAttributes = new ArrayList<MyAttributes>();

    mAttributes.add(new MyAttributes(Color.RED, 80, 70, 199));
    mAttributes.add(new MyAttributes(Color.BLUE, 50, 170, 88));
}


@Override
protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    Paint paint = new Paint();
    paint.setAntiAlias(true);

    int randomPosition = mRandom.nextInt(mAttributes.size());
    MyAttributes randomAttr = mAttributes.get(randomPosition);

    paint.setColor(randomAttr.color);
    canvas.drawCircle(randomAttr.x, randomAttr.y, randomAttr.radius, paint);
}

Try creating a simple Java object to contain all the attributes, then add them to a single list and choose an item at random:

class MyAttributes {
    int color;
    int x, y;
    int radius;

    public MyAttributes(int color, int x, int y, int radius) {
        this.color = color;
        this.x = x;
        this.y = y;
        this.radius = radius;
    }
}

In your View class:

private List<MyAttributes> mAttributes;
private Random mRandom;

public MyViewCircle(Context context) {
    mRandom = new Random();
    mAttributes = new ArrayList<MyAttributes>();

    mAttributes.add(new MyAttributes(Color.RED, 80, 70, 199));
    mAttributes.add(new MyAttributes(Color.BLUE, 50, 170, 88));
}


@Override
protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    Paint paint = new Paint();
    paint.setAntiAlias(true);

    int randomPosition = mRandom.nextInt(mAttributes.size());
    MyAttributes randomAttr = mAttributes.get(randomPosition);

    paint.setColor(randomAttr.color);
    canvas.drawCircle(randomAttr.x, randomAttr.y, randomAttr.radius, paint);
}

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