캔버스를 사용하여 그림을 그리는 방법

먼저이 코드를 참조하십시오 .

public class CustomView extends View {

    public static final int NO_OF_VERTICAL_CIRCLES = 5;
    public static final int NO_OF_HORIZONTAL_CIRCLES = 4;

    public static final float RADIUS = 60f;

    private Paint mPaintImage;

    private RectF[] rectangles = new RectF[NO_OF_HORIZONTAL_CIRCLES
            * NO_OF_VERTICAL_CIRCLES];

    // Just creating a view for drawing
    public CustomView(Context context) {
        super(context);
        init();
    }

    public CustomView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public CustomView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init();
    }

    private void init() {
        // This is paint for your drawing
        mPaintImage = new Paint();

        mPaintImage.setAntiAlias(true);
        mPaintImage.setFilterBitmap(true);
        mPaintImage.setDither(true);
        // color for circle
        mPaintImage.setColor(Color.RED);
        // fill style
        mPaintImage.setStyle(Paint.Style.FILL);

    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {

        // Account for padding
        float xpad = (float) (getPaddingLeft() + getPaddingRight());
        float ypad = (float) (getPaddingTop() + getPaddingBottom());
        // getting area for drawing you can also get it using getWidth() and getHeight()
        float ww = (float) w - xpad;
        float hh = (float) h - ypad;

        Creating Rectangle for drawing your circles
        for (short i = 0; i < NO_OF_HORIZONTAL_CIRCLES; i++) {
            for (short j = 0; j < NO_OF_VERTICAL_CIRCLES; j++) {
                // calculating horizontal centers
                float horizontalCenter = RADIUS + i * (ww - RADIUS * 2)
                        / (NO_OF_HORIZONTAL_CIRCLES - 1);
                // calculating vertical centers
                float verticalCenter = RADIUS + j * (hh - RADIUS * 2)
                        / (NO_OF_VERTICAL_CIRCLES - 1);

                rectangles[j + NO_OF_VERTICAL_CIRCLES * i] = new RectF(
                        horizontalCenter - RADIUS, verticalCenter - RADIUS,
                        horizontalCenter + RADIUS, verticalCenter + RADIUS);

            }
        }

        super.onSizeChanged(w, h, oldw, oldh);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        // Here drawing circles
        for (RectF rect : rectangles) {
            canvas.drawCircle(rect.centerX(), rect.centerY(), RADIUS,
                    mPaintImage);
        }
        super.onDraw(canvas);
    }

여기서 내가 한 일은 그리드에서 sreen을 나눈 다음 중심을 찾아 그에 따라 원을 그리는 것입니다.

비슷한 방법으로 비트 맵, 직사각형을 그릴 수 있습니다.

빈 비트 맵에 그릴 수도 있습니다.

도움이 되길 바랍니다.

PS (스크린 샷) ::