Question

我在android studio中创建了一个正方形，我的代码在下面。我不知道如何集中它。此刻，我从20位的x位置和20位的位置开始。如何使它居中，我是否只需要继续使用坐标，或者是否有办法完全按照坐标进行操作？

package com.example.cms0369.somethingelse;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.view.View;


public class Draw extends View {
Paint paint = new Paint();
//float startX;
//float startY;
//float stopX;
//float stopY;

public Draw(Context context){
    super(context);
    paint.setColor(Color.BLACK);
}

@Override
public void onDraw(Canvas canvas){
    canvas.drawLine(20, 20, 200, 20, paint);
    canvas.drawLine(20, 20, 20, 200, paint);
    canvas.drawLine(20, 200, 200, 200, paint);
    canvas.drawLine(200, 200, 200, 20, paint);
}


}

Answer 1

您可以尝试这样的事情：

int rectSide = ...;

@Override
public void onDraw(Canvas canvas){
    int width = canvas.getWidth();
    int height = canvas.getHeight();
    canvas.drawRect(width/2f - rectSide/2f,
                    height/2f - rectSide/2f,
                    width/2f + rectSide/2f,
                    height/2f + rectSide/2f, paint);
}

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1 个答案: