帆布的OnDraw方法 [英] Canvas OnDraw method

问题描述

我以画线迷宫使用一对布尔数组的（水平和垂直）目前正在创建一个迷宫。

I am currently creating a maze using a pair of boolean array (horizontal and vertical) in order to draw lines for the maze.

迷宫每天只有5显示从一次阵列的bool。然后，我有谁是始终围绕一个用户，并为他的动作穿过迷宫下一组的bool的绘制。这是工作，因为它应该。

The maze only every displays 5 bools from the array at one time. Then, I have an user who is always centered and as he moves through the maze the next set of bools are drawn. This is working as it should.

这是我遇到的问题是：当用户移动到迷宫的某一部分的for循环绘制线条变得比布尔数组较高，因此崩溃的应用程序。请在下面找到一些code片段。

The issue that I am having is: when the user moves to a certain part of the maze the for loop drawing the lines becomes higher than the bool array and therefore crashes the app. Please find below some code snippets.

本的onDraw：

protected void onDraw(Canvas canvas) {
    canvas.drawRect(0, 0, width, height, background);
    int currentX = maze.getCurrentX(),currentY = maze.getCurrentY();
    int drawSizeX = 6 + currentX;
    int drawSizeY = 6 + currentY;
    currentX = currentX - 2;
    currentY = currentY - 2;

    for(int i = 0; i < drawSizeX - 1; i++)  {
        for(int j = 0; j < drawSizeY - 1; j++)  {
            float x = j * totalCellWidth;
            float y = i * totalCellHeight;
            if(vLines[i + currentY][j + currentX])  {
                canvas.drawLine(x + cellWidth,   //start X
                                y,               //start Y
                                x + cellWidth,   //stop X
                                y + cellHeight,  //stop Y
                                line);
            }
            if(hLines[i + currentY][j + currentX]) {
                canvas.drawLine(x,               //startX 
                                y + cellHeight,  //startY 
                                x + cellWidth,   //stopX 
                                y + cellHeight,  //stopY 
                                line);
            }
        }
        //draw the user ball
        canvas.drawCircle((2 * totalCellWidth)+(cellWidth/2),   //x of center
                          (2 * totalCellHeight)+(cellWidth/2),  //y of center
                          (cellWidth*0.45f),                    //radius
                          ball);
    }

编辑1 - 举 -

EDIT 1 - The Move -

public boolean move(int direction) {
    boolean moved = false;
    if(direction == UP) {
        if(currentY != 0 && !horizontalLines[currentY-1][currentX]) {
            currentY--;
            moved = true;
        }
    }
    if(direction == DOWN) {
        if(currentY != sizeY-1 && !horizontalLines[currentY][currentX]) {
            currentY++;
            moved = true;
        }
    }
    if(direction == RIGHT) {
        if(currentX != sizeX-1 && !verticalLines[currentY][currentX]) {
            currentX++;
            moved = true;
        }
    }
    if(direction == LEFT) {
        if(currentX != 0 && !verticalLines[currentY][currentX-1]) {
            currentX--;
            moved = true;
        }
    }
    if(moved) {
        if(currentX == finalX && currentY == finalY) {
            gameComplete = true;
        }
    }
    return moved;
}

如果有其他任何我需要澄清，请让我知道。

If there is anything else that I need to clarify please let me know.

先谢谢了。

推荐答案

drawSizeX / Y阵列上索引时currentX / Y足够高（长-6）

drawSizeX/Y indexes over the array when currentX/Y is high enough (length-6)

所以限制值Math.min（电流+ 6，array.length）

So limit the values to Math.min(current + 6, array.length)

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