如何从底部移动图像连续顶？ [英] How to move images from bottom to top continuously?

问题描述

我一直在工作的例子，从<一个href="http://obviam.net/index.php/a-very-basic-the-game-loop-for-android/">http://obviam.net/index.php/a-very-basic-the-game-loop-for-android/在此我想做出一些改变。

I've been working on the example from http://obviam.net/index.php/a-very-basic-the-game-loop-for-android/ In this I want to make few changes.

Speed​​.java

public class Speed {

    public static final int DIRECTION_RIGHT = 1;
    public static final int DIRECTION_LEFT  = -1;
    public static final int DIRECTION_UP    = -1;
    public static final int DIRECTION_DOWN  = 1;

    private float xv = 1;   // velocity value on the X axis
    private float yv = 1;   // velocity value on the Y axis

    private int xDirection = DIRECTION_RIGHT;
    private int yDirection = DIRECTION_DOWN;

    public Speed() {
        this.xv = 1;
        this.yv = 1;
    }

    public Speed(float xv, float yv) {
        this.xv = xv;
        this.yv = yv;
    }

    public float getXv() {
        return xv;
    }
    public void setXv(float xv) {
        this.xv = xv;
    }
    public float getYv() {
        return yv;
    }
    public void setYv(float yv) {
        this.yv = yv;
    }

    public int getxDirection() {
        return xDirection;
    }
    public void setxDirection(int xDirection) {
        this.xDirection = xDirection;
    }
    public int getyDirection() {
        return yDirection;
    }
    public void setyDirection(int yDirection) {
        this.yDirection = yDirection;
    }

    // changes the direction on the X axis
    public void toggleXDirection() {
        xDirection = xDirection * -1;
    }

    // changes the direction on the Y axis
    public void toggleYDirection() {
        yDirection = yDirection * -1;
    }

}

利用这一点，在各个方向的图像移动。现在，我只想这个运动限制从底部到顶部。而对于的onclick的功能，我们可以单击并拖动图片到所需的位置。我想替换只有使图像消失或转到其他活动。请帮我在更改此code。先谢谢了。

Using this, the image moves in all directions. Now I just want to limit this movement from bottom to top. And the functionality for onclick is that, we can click and drag the image to required position. I want to replace that with just make the image to disappear or go to another activity. Please help me in making changes to this code. Thanks in advance.

推荐答案

如果你已经使用SurfaceView然后在的OnDraw（帆布油画）方法code是从下到上的运动图像是这样的。

if you have used SurfaceView then in onDraw(Canvas canvas) method the code is for moving image from bottom to top is something like this.

canvas.drawBitmap(bitmap,xPoint,yPoint,paint);

其中，位图图像，XPOINT是（位图，你要移动）x坐标，yPoint是Y坐标和涂料是涂料，这也是可以为空。

where bitmap is an image(Bitmap which you want to move),xPoint is the x coordinate,yPoint is the y coordinate and paint is a Paint which is also can be null.

和从下到上的运动刚刚更新

and for bottom to top movement just update

yPoint = yPoint - 1;

在之前的OnDraw任何线程（）电话。

愿这帮助你。

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