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copied!<p>Or just use/copy the code already in the Java method</p> <pre><code>java.awt.geom.Rectangle2D.intersectsLine(double x1, double y1, double x2, double y2) </code></pre> <p>Here is the method after being converted to static for convenience:</p> <pre><code>/** * Code copied from {@link java.awt.geom.Rectangle2D#intersectsLine(double, double, double, double)} */ public class RectangleLineIntersectTest { private static final int OUT_LEFT = 1; private static final int OUT_TOP = 2; private static final int OUT_RIGHT = 4; private static final int OUT_BOTTOM = 8; private static int outcode(double pX, double pY, double rectX, double rectY, double rectWidth, double rectHeight) { int out = 0; if (rectWidth <= 0) { out |= OUT_LEFT | OUT_RIGHT; } else if (pX < rectX) { out |= OUT_LEFT; } else if (pX > rectX + rectWidth) { out |= OUT_RIGHT; } if (rectHeight <= 0) { out |= OUT_TOP | OUT_BOTTOM; } else if (pY < rectY) { out |= OUT_TOP; } else if (pY > rectY + rectHeight) { out |= OUT_BOTTOM; } return out; } public static boolean intersectsLine(double lineX1, double lineY1, double lineX2, double lineY2, double rectX, double rectY, double rectWidth, double rectHeight) { int out1, out2; if ((out2 = outcode(lineX2, lineY2, rectX, rectY, rectWidth, rectHeight)) == 0) { return true; } while ((out1 = outcode(lineX1, lineY1, rectX, rectY, rectWidth, rectHeight)) != 0) { if ((out1 & out2) != 0) { return false; } if ((out1 & (OUT_LEFT | OUT_RIGHT)) != 0) { double x = rectX; if ((out1 & OUT_RIGHT) != 0) { x += rectWidth; } lineY1 = lineY1 + (x - lineX1) * (lineY2 - lineY1) / (lineX2 - lineX1); lineX1 = x; } else { double y = rectY; if ((out1 & OUT_BOTTOM) != 0) { y += rectHeight; } lineX1 = lineX1 + (y - lineY1) * (lineX2 - lineX1) / (lineY2 - lineY1); lineY1 = y; } } return true; } } </code></pre>

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