如何设置画布大小？ [英] How to set canvas size?

问题描述

我有一个名为SeatsPanel，我画的方法的onDraw座（使用的drawRect）类。该方法的onDraw使用帆布作为参数，但你如何设置画布大小？为什么我问这个问题的原因是因为这个类是在其他类被夸大了。我知道，在画布上有手机的默认的高度和宽度，但我需要使它更小。我怎样才能做到这一点？

I have a class named SeatsPanel where I draw seats (using drawRect) in the onDraw method. The onDraw method uses Canvas as a parameter, but how do you set size of the Canvas? The reason why I'm asking this question is because this class is being inflated in another class. I know that the canvas has the default height and width of the phone, but I need to make it smaller. How can I do this?

任何帮助将是AP preciated。

Any help would be appreciated.

-Tolga -

-Tolga-

推荐答案

我试图实现一个简单的应用程序，吸引的主要活动中的一个黑色矩形，被吸入按下一个按钮。例如，在 MainActivity ：

I've tried to implement a simple application that draws a black rect within the main activity, that is drawn pushing a button. For example, in the MainActivity:

    private Button button1;
    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    button1=(Button)findViewById(R.id.button);
    button1.setOnClickListener(new OnClickListener(){

            public void onClick(View v) {
             switch(v.getId()){
                case R.id.button:

                     LinearLayout ll=(LinearLayout)findViewById(R.id.linearLayout1);
                     System.out.println(ll.getWidth()+" "+ll.getHeight());
                     LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(ll.getWidth(),ll.getHeight());
                     YourView yourView = new YourView(getBaseContext());
                     yourView.setBackgroundColor(Color.WHITE);
                     ll.addView(yourView,params);
                    break;
             }

        }

    });

}

而在 YourView 类：

    private Bitmap savedBitmap;
public YourView(Context context) {
    super(context);
}
public void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    System.out.println(canvas.getWidth()+" "+canvas.getHeight());

    Paint textPaint = new Paint();
    textPaint.setARGB(255, 0, 0, 0);
    textPaint.setTextAlign(Paint.Align.RIGHT);
    textPaint.setTextSize(11);
    textPaint.setTypeface(Typeface.DEFAULT);

    canvas.drawColor(Color.WHITE);
    System.out.println(canvas.getWidth());
    System.out.println(canvas.getHeight());

    canvas.drawRect(200, 20, 500, 100, textPaint);
}

在main.xml中：

The main.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<TextView
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="Push the button and draw a Rect" />

<Button
    android:id="@+id/button"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="Button" />




<LinearLayout
    android:id="@+id/linearLayout1"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

</LinearLayout>

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