Question

如何使用DrawRect方法在画布上绘制一组矩形？我试图通过传递块的坐标来生成动态室内地图。

我想知道..如何在for循环中使用drawRect方法..！

我在Luke Taylor的帮助下完成了两门课程。（谢谢..！:)）

一个是坐标，另一个是名为DrawMapActivity的主类。现在我需要知道如何填充坐标数组???

打包itgsm.drawmap;

import android.app.Activity;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.os.Bundle;

public class DrawMapActivity extends Activity {
/** Called when the activity is first created. */

static Coordinates[] coordinates = new Coordinates[10]; // 10 is just an example

//    public void onCreate(Bundle savedInstanceState) {
//        super.onCreate(savedInstanceState);
//        setContentView(R.layout.main);
//     
//    }

public void onDraw(Canvas canvas) {

    Paint myPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
    myPaint.setStrokeWidth(8/*1 /getResources().getDisplayMetrics().density*/);
    myPaint.setColor(0xffff0000);   //color.RED

    for(int i = 0; i < coordinates.length; i++) {
        canvas.drawRect(new Rect(coordinates[i].getX(), coordinates[i].getY(),   coordinates[i].getX() + 10,coordinates[i].getY() + 10), myPaint); // 10 is the dimension of your block
        }


}
}

Answer 1

您可以创建一个方法，该方法接受包含坐标的对象数组：

这将是包含坐标的名为“Coordinate”的类。

public class Coordinate {

int x;
int y;

public void setX(int x) {
this.x = x;
}

public void setY(int y) {
this.y = y;
}

public int getX() {
return this.x;
}

public int getY() {
return this.y;

}

}

您可以创建包含各个坐标的这些对象的数组：

Coordinates[] coordinates = new Coordinates[10]; // 10 is just an example

在渲染方法中，您现在可以渲染各个块。

public void drawMap(Coordinates[] coordinates) {
for(int i = 0; i < coordinates.length; i++) {
canvas.drawRect(new Rect(coordinates[i].getX, coordinates[i].getY, coordinates[i].getX + 10,coordinates[i].getY + 10), paint); // 10 is the dimension of your block
}
}

我希望这会有所帮助。

<强>更新

这是使用Coordinate对象填充数组的一个索引的方法：

coordinates[1] = new Coordinate();
coordinates[1].setX(0);
coordinates[1].setY(0);

Answer 2

    public class DrawDemo extends Activity {
DemoView demoview;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    demoview = new DemoView(this);
    setContentView(demoview);
}

private class DemoView extends View{
    public DemoView(Context context){
        super(context);
    }

    @Override protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        // custom drawing code here
        // remember: y increases from top to bottom
        // x increases from left to right
        int x = 0;
        int y = 0;
        Paint paint = new Paint();
        paint.setStyle(Paint.Style.FILL);

        // make the entire canvas white
        paint.setColor(Color.WHITE);
        canvas.drawPaint(paint);
        // another way to do this is to use:
        // canvas.drawColor(Color.WHITE);

        // draw a solid green rectangle
        paint.setAntiAlias(false);
        paint.setColor(Color.GREEN);
                    for(int i=0;i<10;i++)
                     {
                    //make changes in arguments here
        canvas.drawRect(100, 5, 200, 30, paint);
                     }
                     }
                      }
                      }

如何在for循环中使用drawRect方法？

2 个答案: