function drawCollisionBoxes(canvasCtx, tRexBox, obstacleBox) {
        canvasCtx.save();
        canvasCtx.strokeStyle = '#f00';
        canvasCtx.strokeRect(tRexBox.x, tRexBox.y, tRexBox.width, tRexBox.height);

        canvasCtx.strokeStyle = '#0f0';
        canvasCtx.strokeRect(obstacleBox.x, obstacleBox.y,
            obstacleBox.width, obstacleBox.height);
        canvasCtx.restore();
    }
Draw the collision boxes for debug.