小ワザ/対応する四辺が平行な矩形同士の交差判定２

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#const global W1 100    // 赤い矩形の幅・高さ
#const global H1 100
#const global W2 70     // 青い矩形の幅・高さ
#const global H2 50
 
#module
#defcfunc hit int x1, int y1, int x2, int y2
    return (x1 < x2 + W2)&(y1 < y2 + H2)&(x2 < x1 + W1)&(y2 < y1 + H1)
#global
 
    x1 =   1 : y1 =   1
    x2 = 100 : y2 = 100
 
*main
    gosub *move
    gosub *draw
    wait 1
    goto *main
 
*move
    // カーソルキーで矩形の移動。Shift同時押しで操作する矩形の切り替え。
    stick key, 15 + 64
 
    if (key & 64) {
        x2 += ((key >> 2) & 1) - (key & 1)
        y2 += ((key >> 3) & 1) - ((key >> 1) & 1)
    } else {
        x1 += ((key >> 2) & 1) - (key & 1)
        y1 += ((key >> 3) & 1) - ((key >> 1) & 1)
    }
    return
 
*draw
    redraw 0
    color 255, 255, 255 : boxf
 
    color 255
    boxf x1, y1, x1 + W1 - 1, y1 + H1 - 1
    color 0, 0, 255
    boxf x2, y2, x2 + W2 - 1, y2 + H2 - 1
 
    if(hit(x1, y1, x2, y2)){
        title "衝突！"
    } else {
        title "..."
    }
 
    redraw 1
    return