Android2.2.3 达成多点缩放功能

发布时间：2021-11-24 17:48:53 所属栏目：教程来源：互联网

导读：Android2.2.3 实现多点缩放功能： // 触摸事件 @Override public boolean onTouchEvent(MotionEvent event) { if (false == this.is_initialized()) { return false; } try { PointF point_s = new PointF(); point_s.x = event.getX(); point_s.y = event.g

Android2.2.3 实现多点缩放功能：

// 触摸事件
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (false == this.is_initialized()) {
            return false;
        }

        try {
            PointF point_s = new PointF();
            point_s.x = event.getX();
            point_s.y = event.getY();
            int x = (int) point_s.x;// Float.to( event.getX() );
            int y = (int) point_s.y;// Float.floatToIntBits( event.getY() );

            switch (event.getAction() & MotionEvent.ACTION_MASK) {
            case MotionEvent.ACTION_DOWN:
                m_pressPt.set(x, y);
                mode = DRAG;
                break;
            case MotionEvent.ACTION_UP:

                if (mode == DRAG) {
                    int px = x - m_pressPt.x;
                    int py = y - m_pressPt.y;

                    if (px != 0 && py != 0) {
                        m_naviEngine.SetCenter(480 - px, 270 - py);
                    }
                }


                mode = NONE;

                break;

            case MotionEvent.ACTION_POINTER_UP:
                if (mode == ZOOM) {
                    float newDist = spacing(event);
                    if (newDist > 10f) {
                        float scale = newDist - oldDist;
                        if (scale > 0) {
                            m_levelIndex = getLevelIndex();
                            // 设置当前比例尺
                            if (m_levelIndex < m_level.length - 1) {
                                m_levelIndex++;
                                m_naviEngine.SetLevel(m_level[m_levelIndex]);
                                m_btnZoomOut.setEnabled(true);
                                if (m_levelIndex == m_level.length - 1) {
                                    m_btnZoomIn.setEnabled(false);
                                }

                                // 更新信息弹出框
                                // showPopSign();

                            }
                        } else {
                            m_levelIndex = getLevelIndex();
                            // 设置当前比例尺以及按钮状态
                            if (m_levelIndex > 0) {
                                m_levelIndex--;
                                m_naviEngine.SetLevel(m_level[m_levelIndex]);
                                m_btnZoomIn.setEnabled(true);
                                if (m_levelIndex == 0) {
                                    m_btnZoomOut.setEnabled(false);
                                }

                                // 更新信息弹出框
                                // showPopSign();
                            }
                        }
                    }
                }
                break;
            case MotionEvent.ACTION_POINTER_DOWN:
                oldDist = spacing(event);
                if (oldDist > 10f) {

                    mode = ZOOM;

                }
                break;
            }
        } catch (UnsatisfiedLinkError e) {
            return false;
        }

        return m_gestureScanner.onTouchEvent(event);
    }

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